Pub Date : 2025-11-01Epub Date: 2025-08-16DOI: 10.1016/j.aime.2025.100169
Dana Godinez , Anannya Doris , Edel Arrieta , Lawrence E. Murr , Colton Katsarelis , Paul R. Gradl , Amit J. Lopes , Francisco Medina
This study investigates the influence of laser power and subsequent heat treatments on the microstructure and mechanical properties of Inconel 718 specimens fabricated via Laser Powder Directed Energy Deposition (LP-DED). Five sets of samples, produced using laser power ranging from 350 W to 2620 W, were subjected to a standardized heat treatment process comprising stress relief, hot isostatic pressing (HIP), solution treatment, and two-step aging. The evolution of the microstructure at each heat treatment stage was characterized in correlation with hardness, tensile properties, and fatigue life. Results demonstrate that complete heat treatment homogenizes and refines the microstructure, transitioning from dendritic to an austenitic structure with annealing twins, leading to an increase in hardness. Additionally, despite variations in printing parameters, mechanical properties such as tensile strength and fatigue resistance remained consistent. This study reveals that specimens fabricated at 350 W exhibited the finest microstructure, yielding overall superior mechanical properties. These findings contribute to the optimization of post-processing methodologies for LP-DED-manufactured Inconel 718 components, particularly for aerospace applications.
{"title":"Analysis of process parameter variations and heat treatment effects on the microstructure and mechanical properties of Inconel 718 fabricated by laser powder directed energy deposition (LP-DED)","authors":"Dana Godinez , Anannya Doris , Edel Arrieta , Lawrence E. Murr , Colton Katsarelis , Paul R. Gradl , Amit J. Lopes , Francisco Medina","doi":"10.1016/j.aime.2025.100169","DOIUrl":"10.1016/j.aime.2025.100169","url":null,"abstract":"<div><div>This study investigates the influence of laser power and subsequent heat treatments on the microstructure and mechanical properties of Inconel 718 specimens fabricated via Laser Powder Directed Energy Deposition (LP-DED). Five sets of samples, produced using laser power ranging from 350 W to 2620 W, were subjected to a standardized heat treatment process comprising stress relief, hot isostatic pressing (HIP), solution treatment, and two-step aging. The evolution of the microstructure at each heat treatment stage was characterized in correlation with hardness, tensile properties, and fatigue life. Results demonstrate that complete heat treatment homogenizes and refines the microstructure, transitioning from dendritic to an austenitic structure with annealing twins, leading to an increase in hardness. Additionally, despite variations in printing parameters, mechanical properties such as tensile strength and fatigue resistance remained consistent. This study reveals that specimens fabricated at 350 W exhibited the finest microstructure, yielding overall superior mechanical properties. These findings contribute to the optimization of post-processing methodologies for LP-DED-manufactured Inconel 718 components, particularly for aerospace applications.</div></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":"11 ","pages":"Article 100169"},"PeriodicalIF":6.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144864613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-07-20DOI: 10.1016/j.aime.2025.100168
F. Bahari-Sambran , A. Orozco-Caballero , F. Carreño , C.M. Cepeda-Jiménez
This study explores the use of artificial neural networks (ANN) and transfer learning (TL) to develop processing maps that guide defect-free manufacturing of as-built L-PBF aluminum (AlSi10Mg) and stainless steel (SS316L) specimens. The complex non-linear relationships between processing parameters and the thermal properties of the materials, which influence melt pool development, highlight the need for machine learning (ML) tools to achieve high-quality processability in a cost-effective manner. Commercial AlSi10Mg and SS316L powders were processed using L-PBF, resulting in various types of porosity, such as keyhole and lack-of-fusion defects, under different processing conditions. We first characterized the bulk density and melt pool features (width and depth) through optical microscopy and image analysis. Next, we trained ANN base models using data from existing literature to predict the bulk density and melt pool geometries of the as-built samples. Finally, we refined these models with our experimental data after transferring the base models. The results indicate that our proposed models and TL methodology effectively predict processing maps, identify optimal processing parameters for maximum density, and establish the threshold for lack-of-fusion porosity.
{"title":"Predictive processing maps for laser-powder bed fusion using transfer learning and melt pool geometry","authors":"F. Bahari-Sambran , A. Orozco-Caballero , F. Carreño , C.M. Cepeda-Jiménez","doi":"10.1016/j.aime.2025.100168","DOIUrl":"10.1016/j.aime.2025.100168","url":null,"abstract":"<div><div>This study explores the use of artificial neural networks (ANN) and transfer learning (TL) to develop processing maps that guide defect-free manufacturing of as-built L-PBF aluminum (AlSi10Mg) and stainless steel (SS316L) specimens. The complex non-linear relationships between processing parameters and the thermal properties of the materials, which influence melt pool development, highlight the need for machine learning (ML) tools to achieve high-quality processability in a cost-effective manner. Commercial AlSi10Mg and SS316L powders were processed using L-PBF, resulting in various types of porosity, such as keyhole and lack-of-fusion defects, under different processing conditions. We first characterized the bulk density and melt pool features (width and depth) through optical microscopy and image analysis. Next, we trained ANN base models using data from existing literature to predict the bulk density and melt pool geometries of the as-built samples. Finally, we refined these models with our experimental data after transferring the base models. The results indicate that our proposed models and TL methodology effectively predict processing maps, identify optimal processing parameters for maximum density, and establish the threshold for lack-of-fusion porosity.</div></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":"11 ","pages":"Article 100168"},"PeriodicalIF":3.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144694571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-06-07DOI: 10.1016/j.aime.2025.100166
Andrea Rega , Francesco Giuseppe Ciampi , Alessandro Zanella , Abdelgafar Ismail , Stanislao Patalano
Industry 5.0 requires practical methods to translate Augmented Reality (AR) concepts into effective shop floor applications, demonstrating their value to operators. This study introduces a framework for implementing and validating Augmented Reality (AR)-based tools designed to enhance sustainability awareness and assist operators in energy management within industrial settings. The approach combines a reference software architecture for rapid AR deployment with a three-part user-experience assessment, measuring usability (System Usability Scale - SUS), technology acceptance (Technology Acceptance Model - TAM), and cognitive workload (NASA-TLX). To test this framework, an AR-based prototype tool was deployed on enterprise smartphones and evaluated in three scenarios: monitoring service-utility energy consumption, monitoring production equipment, and conducting on- and off-the-job training of the operators. Thirty shop floor professionals completed tasks and provided UX feedback. The results showed good usability (mean SUS 78.4/100), with perceived ease of use and contextual relevance driving technology acceptance. Moreover Nasa TLX analysis indicates mental demand as the predominant factor. The findings confirm that the framework enables effective, human-centered AR deployments in modern industry and provides concrete design guidelines for future implementations.
{"title":"Implementation and evaluation of an Augmented Reality framework for sustainable practices in Industry 5.0","authors":"Andrea Rega , Francesco Giuseppe Ciampi , Alessandro Zanella , Abdelgafar Ismail , Stanislao Patalano","doi":"10.1016/j.aime.2025.100166","DOIUrl":"10.1016/j.aime.2025.100166","url":null,"abstract":"<div><div>Industry 5.0 requires practical methods to translate Augmented Reality (AR) concepts into effective shop floor applications, demonstrating their value to operators. This study introduces a framework for implementing and validating Augmented Reality (AR)-based tools designed to enhance sustainability awareness and assist operators in energy management within industrial settings. The approach combines a reference software architecture for rapid AR deployment with a three-part user-experience assessment, measuring usability (System Usability Scale - SUS), technology acceptance (Technology Acceptance Model - TAM), and cognitive workload (NASA-TLX). To test this framework, an AR-based prototype tool was deployed on enterprise smartphones and evaluated in three scenarios: monitoring service-utility energy consumption, monitoring production equipment, and conducting on- and off-the-job training of the operators. Thirty shop floor professionals completed tasks and provided UX feedback. The results showed good usability (mean SUS 78.4/100), with perceived ease of use and contextual relevance driving technology acceptance. Moreover Nasa TLX analysis indicates mental demand as the predominant factor. The findings confirm that the framework enables effective, human-centered AR deployments in modern industry and provides concrete design guidelines for future implementations.</div></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":"11 ","pages":"Article 100166"},"PeriodicalIF":3.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-06-07DOI: 10.1016/j.aime.2025.100167
Federico Mazzucato, Anna Valente
Laser Metal Deposition is finding growing industrial attractiveness thanks to its unique capability to locally restore worn metal components. In recent years, the industry is focusing on the application of metal Additive Manufacturing for the restoration of moulds and dies to improve process efficiency by reducing machine downtime and spare parts storage expenses. Although mould repair proved to be a cost-effective technological solution, the restoration of geometrically complex high carbon steel alloys through laser-based Additive Manufacturing still presents criticalities due to the low material weldability, high material oxygen reactivity, and high residual stresses generated by thermal cycling. This research work aims to analyse the influence of substrate preheating and the building environment on the structural integrity of steel specimens exhibiting 0.85 % carbon content and implementing geometrical features which are generally critical to restore by laser-based processes since they behave as thermal stress concentration. The performed preliminary observations highlight no delamination and no oxide regardless of process conditions. High-density (99.99 %) and crack-free high carbon steel depositions are achieved by reducing melt pool cooling rates during part manufacturing as a result of the increased environmental temperature surrounding the as-deposited material. Metallographic analysis demonstrates that carbide size decreases as cooling rates increase.
{"title":"Study on the influence of substrate preheating and deposition environment on the structural integrity of high carbon steel LMD parts of increased geometrical complexity","authors":"Federico Mazzucato, Anna Valente","doi":"10.1016/j.aime.2025.100167","DOIUrl":"10.1016/j.aime.2025.100167","url":null,"abstract":"<div><div>Laser Metal Deposition is finding growing industrial attractiveness thanks to its unique capability to locally restore worn metal components. In recent years, the industry is focusing on the application of metal Additive Manufacturing for the restoration of moulds and dies to improve process efficiency by reducing machine downtime and spare parts storage expenses. Although mould repair proved to be a cost-effective technological solution, the restoration of geometrically complex high carbon steel alloys through laser-based Additive Manufacturing still presents criticalities due to the low material weldability, high material oxygen reactivity, and high residual stresses generated by thermal cycling. This research work aims to analyse the influence of substrate preheating and the building environment on the structural integrity of steel specimens exhibiting 0.85 % carbon content and implementing geometrical features which are generally critical to restore by laser-based processes since they behave as thermal stress concentration. The performed preliminary observations highlight no delamination and no oxide regardless of process conditions. High-density (99.99 %) and crack-free high carbon steel depositions are achieved by reducing melt pool cooling rates during part manufacturing as a result of the increased environmental temperature surrounding the as-deposited material. Metallographic analysis demonstrates that carbide size decreases as cooling rates increase.</div></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":"11 ","pages":"Article 100167"},"PeriodicalIF":3.9,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144272248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-10-10DOI: 10.1016/j.aime.2025.100173
Koen Nijland , Aijse de Vries , Paul Preenen , Sri Kolla , Sebastian Thiede
As workplaces become increasingly complex, manufacturing companies must adopt technologies that not only fulfill customer requirements but also prioritize high-quality jobs for production workers. Assistance systems are gaining popularity because they can enhance manufacturing performance and support sufficient job quality. However, there is a lack of detailed insights into the application-specific impact of the systems. This study classifies the use of assistance systems in manufacturing, deriving characteristic archetypes and mapping their impacts through a systematic review of existing literature. Analyzing 56 cases from 40 studies using descriptive and cluster analysis, four main archetypes are identified: (1) manually operated physical execution support for routine assembly tasks, (2) automatically operated and adaptable visual task guidance for routine assembly tasks, (3) automatically operated and adaptive visual support for non-routine diagnostics tasks, and (4) automatically operated and adaptive physical execution support for routine assembly. Findings suggest that these archetypes offer potential benefits and risks for job quality and manufacturing performance. However, their successful use requires careful consideration of role division, task execution capabilities, task support capabilities, and long-term impacts. The current literature on assistance systems needs more longitudinal empirical studies to provide clear guidance for both researchers and industry practitioners.
{"title":"Archetypes of assistance systems and their impacts on manufacturing performance and job quality","authors":"Koen Nijland , Aijse de Vries , Paul Preenen , Sri Kolla , Sebastian Thiede","doi":"10.1016/j.aime.2025.100173","DOIUrl":"10.1016/j.aime.2025.100173","url":null,"abstract":"<div><div>As workplaces become increasingly complex, manufacturing companies must adopt technologies that not only fulfill customer requirements but also prioritize high-quality jobs for production workers. Assistance systems are gaining popularity because they can enhance manufacturing performance and support sufficient job quality. However, there is a lack of detailed insights into the application-specific impact of the systems. This study classifies the use of assistance systems in manufacturing, deriving characteristic archetypes and mapping their impacts through a systematic review of existing literature. Analyzing 56 cases from 40 studies using descriptive and cluster analysis, four main archetypes are identified: (1) manually operated physical execution support for routine assembly tasks, (2) automatically operated and adaptable visual task guidance for routine assembly tasks, (3) automatically operated and adaptive visual support for non-routine diagnostics tasks, and (4) automatically operated and adaptive physical execution support for routine assembly. Findings suggest that these archetypes offer potential benefits and risks for job quality and manufacturing performance. However, their successful use requires careful consideration of role division, task execution capabilities, task support capabilities, and long-term impacts. The current literature on assistance systems needs more longitudinal empirical studies to provide clear guidance for both researchers and industry practitioners.</div></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":"11 ","pages":"Article 100173"},"PeriodicalIF":6.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145362184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-11-05DOI: 10.1016/j.aime.2025.100174
Zahra Silvayeh , Josef Domitner , Peter Auer , Gean Henrique Marcatto de Oliveira , Marta Lipińska , Christof Sommitsch
This work investigates the influence of the automotive paint baking (PB) process, a heat treatment typically applied to assembled and dip-coated car bodies-in-white (BIW), on the basic mechanical performance of lightweight aluminum-steel blanks. For this purpose, 1.2 mm-thin sheets of AW-6016-T4 aluminum alloy were butt-welded-brazed to 0.8 mm-thin sheets of DC04 zinc-coated steel using the Cold Metal Transfer (CMT) process and an AA-4020 aluminum alloy filler. The aluminum-steel blanks were subjected to a post-weld heat treatment (PWHT) for 20 min at 185 ± 2 °C, simulating industrial paint baking conditions. Samples for microstructure analysis, hardness testing and quasi-static and cyclic tensile testing were prepared from the blanks. Under all loading conditions, fracture of the as-welded and heat-treated samples primarily occurred in the aluminum-based weld, but fracture in the steel sheet occurred in cases of low porosity or high reinforcement of the weld. The heat treatment slightly improved the quasi-static tensile and low-cycle fatigue performance, but it decreased the high-cycle fatigue performance. Moreover, it reduced the hardness mismatch between different zones, causing more homogeneous properties across the joints. Nevertheless, the primary failure mode of the blanks did not change, as the influence of the weld porosity was more significant than the influence of the heat treatment. The results provide a fundamental understanding of the bake hardening response, reveal insights into the porosity-related failure behavior under quasi-static and cyclic tensile loadings, and highlight the importance for avoiding weld defects to exploit the load-bearing capacity of butt-welded-brazed aluminum-steel blanks.
{"title":"Influence of paint baking conditions on the mechanical performance of thin aluminum-steel blanks","authors":"Zahra Silvayeh , Josef Domitner , Peter Auer , Gean Henrique Marcatto de Oliveira , Marta Lipińska , Christof Sommitsch","doi":"10.1016/j.aime.2025.100174","DOIUrl":"10.1016/j.aime.2025.100174","url":null,"abstract":"<div><div>This work investigates the influence of the automotive paint baking (PB) process, a heat treatment typically applied to assembled and dip-coated car bodies-in-white (BIW), on the basic mechanical performance of lightweight aluminum-steel blanks. For this purpose, 1.2 mm-thin sheets of AW-6016-T4 aluminum alloy were butt-welded-brazed to 0.8 mm-thin sheets of DC04 zinc-coated steel using the Cold Metal Transfer (CMT) process and an AA-4020 aluminum alloy filler. The aluminum-steel blanks were subjected to a post-weld heat treatment (PWHT) for 20 min at 185 ± 2 °C, simulating industrial paint baking conditions. Samples for microstructure analysis, hardness testing and quasi-static and cyclic tensile testing were prepared from the blanks. Under all loading conditions, fracture of the as-welded and heat-treated samples primarily occurred in the aluminum-based weld, but fracture in the steel sheet occurred in cases of low porosity or high reinforcement of the weld. The heat treatment slightly improved the quasi-static tensile and low-cycle fatigue performance, but it decreased the high-cycle fatigue performance. Moreover, it reduced the hardness mismatch between different zones, causing more homogeneous properties across the joints. Nevertheless, the primary failure mode of the blanks did not change, as the influence of the weld porosity was more significant than the influence of the heat treatment. The results provide a fundamental understanding of the bake hardening response, reveal insights into the porosity-related failure behavior under quasi-static and cyclic tensile loadings, and highlight the importance for avoiding weld defects to exploit the load-bearing capacity of butt-welded-brazed aluminum-steel blanks.</div></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":"11 ","pages":"Article 100174"},"PeriodicalIF":6.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145568756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The process-microstructure relationship of gamma-titanium aluminide (Ti-48Al-2Cr-2Nb) parts fabricated via electron beam-powder bed fusion (PBF-EB) process was investigated. A set of 107 records of process parameter combinations were deployed to analyze and classify relative density, lack-of-fusion (LoF) and Gas porosity defects. The bulk density ranges spanned 88 %–99.99 %, with Gas porosity spanning 0.01 %–0.30 %, and lack-of-fusion defects spanning 0.001 %–12 %. Based on literature pertaining to defects addressable via hot isostatic pressing, four classes of density performance were identified: excellent (>99.8 %), good (99.6–99.8 %), poor (98.0–99.6 %), and failed (<98.0 %). For the purpose of this study, a high density outcome (excellent class) is identified to be ideal in terms of expected mechanical properties, specifically strength, fatigue, and ductility. Pore properties were mapped against different energy representations, for example, volumetric energy density (VED) and normalized enthalpy (NE). The results showed the importance of utilizing NE to visualize data and identify zones in the process parameter space where best performance is expected. A region of NE > 15 is expected to have an excellent performance, whereas NE < 10 is expected to result in unacceptable porosity outcomes.
{"title":"Comprehensive pore defect analysis for electron beam-powder bed fusion of Ti48Al2Cr2Nb","authors":"Tomisin Ayeni , Paria Karimi , Mohsen K. Keshavarz , Esmaeil Sadeghi , Mahdi Habibnejad-korayem , Mihaela Vlasea","doi":"10.1016/j.aime.2025.100170","DOIUrl":"10.1016/j.aime.2025.100170","url":null,"abstract":"<div><div>The process-microstructure relationship of gamma-titanium aluminide (Ti-48Al-2Cr-2Nb) parts fabricated via electron beam-powder bed fusion (PBF-EB) process was investigated. A set of 107 records of process parameter combinations were deployed to analyze and classify relative density, lack-of-fusion (LoF) and Gas porosity defects. The bulk density ranges spanned 88 %–99.99 %, with Gas porosity spanning 0.01 %–0.30 %, and lack-of-fusion defects spanning 0.001 %–12 %. Based on literature pertaining to defects addressable via hot isostatic pressing, four classes of density performance were identified: excellent (>99.8 %), good (99.6–99.8 %), poor (98.0–99.6 %), and failed (<98.0 %). For the purpose of this study, a high density outcome (excellent class) is identified to be ideal in terms of expected mechanical properties, specifically strength, fatigue, and ductility. Pore properties were mapped against different energy representations, for example, volumetric energy density (VED) and normalized enthalpy (NE). The results showed the importance of utilizing NE to visualize data and identify zones in the process parameter space where best performance is expected. A region of NE > 15 is expected to have an excellent performance, whereas NE < 10 is expected to result in unacceptable porosity outcomes.</div></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":"11 ","pages":"Article 100170"},"PeriodicalIF":6.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145007574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-01Epub Date: 2025-09-17DOI: 10.1016/j.aime.2025.100172
Ákos Meilinger, Gábor Terdik
The use of high-strength steels as base materials for hardfacing is becoming increasingly important, particularly in applications subjected to frequent dynamic loads (e.g., demolition shears). The heat-affected zone (HAZ) of hardfaced components is significantly more complex than that in conventional welded joints. Adjacent hardfacing layers lead to the formation of HAZ subzones that undergo multiple thermal cycles, and these zones have not been thoroughly investigated before. High-strength steels are more sensitive to thermal cycles, and the properties of the HAZ subzones fundamentally determine the load-bearing capacity of hardfaced parts. In this study, S690QL, S960QL, and S1100QL base materials were used. Hardness testing identified the subzones subjected to three thermal cycles as the most critical. These specific subzones were reproduced using a Gleeble physical simulator by applying three successive thermal cycles. Instrumented impact tests were performed on the simulated specimens, and the results were analyzed statistically. Fractographic analysis was also conducted, revealing clear differences between fractured specimens through quantitative evaluation. For S690QL, the impact properties of the critical subzones did not show significant changes. In contrast, for S960QL, the subzones exposed to three thermal cycles demonstrated improved impact energy with reduced impact force. Surprisingly, the HAZ subzones of S1100QL exhibited impact energies more than three times higher than those of the base material. These results clearly indicate that the subzones subjected to three thermal cycles are softer, yet their impact properties are equal to or better than those of the base material.
{"title":"Hardfacing on high-strength steels: Properties of multiple times heated heat-affected zones","authors":"Ákos Meilinger, Gábor Terdik","doi":"10.1016/j.aime.2025.100172","DOIUrl":"10.1016/j.aime.2025.100172","url":null,"abstract":"<div><div>The use of high-strength steels as base materials for hardfacing is becoming increasingly important, particularly in applications subjected to frequent dynamic loads (e.g., demolition shears). The heat-affected zone (HAZ) of hardfaced components is significantly more complex than that in conventional welded joints. Adjacent hardfacing layers lead to the formation of HAZ subzones that undergo multiple thermal cycles, and these zones have not been thoroughly investigated before. High-strength steels are more sensitive to thermal cycles, and the properties of the HAZ subzones fundamentally determine the load-bearing capacity of hardfaced parts. In this study, S690QL, S960QL, and S1100QL base materials were used. Hardness testing identified the subzones subjected to three thermal cycles as the most critical. These specific subzones were reproduced using a Gleeble physical simulator by applying three successive thermal cycles. Instrumented impact tests were performed on the simulated specimens, and the results were analyzed statistically. Fractographic analysis was also conducted, revealing clear differences between fractured specimens through quantitative evaluation. For S690QL, the impact properties of the critical subzones did not show significant changes. In contrast, for S960QL, the subzones exposed to three thermal cycles demonstrated improved impact energy with reduced impact force. Surprisingly, the HAZ subzones of S1100QL exhibited impact energies more than three times higher than those of the base material. These results clearly indicate that the subzones subjected to three thermal cycles are softer, yet their impact properties are equal to or better than those of the base material.</div></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":"11 ","pages":"Article 100172"},"PeriodicalIF":6.0,"publicationDate":"2025-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145094857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-01Epub Date: 2025-03-18DOI: 10.1016/j.aime.2025.100161
Elizabeth M. Mamros , Fabian Maaß , Thomas H. Gnäupel-Herold , A. Erman Tekkaya , Brad L. Kinsey , Jinjin Ha
Stress superposition is one of the strategies used in metal deformation processes to increase the material formability, decrease the required forming forces, and create highly customized components. To investigate the effects of tensile and compressive stresses superposed to the single point incremental forming (SPIF) process, experiments and numerical simulations were conducted for a stainless steel 304 (SS304) truncated square pyramid geometry. Tensile stresses were superposed in-plane on the specimen blank by a custom hydraulic frame, and compressive stresses were incorporated via a polyurethane die. Identified parameters for a martensitic transformation kinetics model for SS304 were used in a two-step finite element approach to predict the ’-martensite volume fraction. These results were compared to experimental results measured by a Feritscope at four locations along each pyramid wall and validated by electron backscatter diffraction. The residual stresses were measured using x-ray diffraction. The parts from each incremental forming process revealed differences in the residual stresses, which impacted the final geometries, and the ’-martensite volume fraction at the four measurement locations. The evolution of the stress state, defined by the stress triaxiality and Lode angle parameter, for each process contributed to the phase transformation variance. It was found that superposing both tensile and compressive stresses to SPIF resulted in the greatest phase transformation and lowest magnitude of residual stresses near the base and the greatest overall geometrical accuracy. Stress-superposed incremental forming can be implemented to manipulate final part properties, which is ideal for applications requiring highly customized parts, e.g., biomedical trauma fixation hardware.
{"title":"Manipulating martensitic transformation and residual stress development in stress superposed incremental forming of SS304","authors":"Elizabeth M. Mamros , Fabian Maaß , Thomas H. Gnäupel-Herold , A. Erman Tekkaya , Brad L. Kinsey , Jinjin Ha","doi":"10.1016/j.aime.2025.100161","DOIUrl":"10.1016/j.aime.2025.100161","url":null,"abstract":"<div><div>Stress superposition is one of the strategies used in metal deformation processes to increase the material formability, decrease the required forming forces, and create highly customized components. To investigate the effects of tensile and compressive stresses superposed to the single point incremental forming (SPIF) process, experiments and numerical simulations were conducted for a stainless steel 304 (SS304) truncated square pyramid geometry. Tensile stresses were superposed in-plane on the specimen blank by a custom hydraulic frame, and compressive stresses were incorporated via a polyurethane die. Identified parameters for a martensitic transformation kinetics model for SS304 were used in a two-step finite element approach to predict the <span><math><mrow><mi>α</mi></mrow></math></span>’-martensite volume fraction. These results were compared to experimental results measured by a Feritscope at four locations along each pyramid wall and validated by electron backscatter diffraction. The residual stresses were measured using x-ray diffraction. The parts from each incremental forming process revealed differences in the residual stresses, which impacted the final geometries, and the <span><math><mrow><mi>α</mi></mrow></math></span>’-martensite volume fraction at the four measurement locations. The evolution of the stress state, defined by the stress triaxiality and Lode angle parameter, for each process contributed to the phase transformation variance. It was found that superposing both tensile and compressive stresses to SPIF resulted in the greatest phase transformation and lowest magnitude of residual stresses near the base and the greatest overall geometrical accuracy. Stress-superposed incremental forming can be implemented to manipulate final part properties, which is ideal for applications requiring highly customized parts, e.g., biomedical trauma fixation hardware.</div></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":"10 ","pages":"Article 100161"},"PeriodicalIF":3.9,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-05-01Epub Date: 2025-05-06DOI: 10.1016/j.aime.2025.100165
Y. Zhang , J.C. Outeiro , C. Nouveau , B. Marcon , L.A. Denguir
Cr/CrN/AlCrN multilayer coatings were recently developed to meet the high challenges of machining Ti-6Al-4V alloy under cryogenic cooling conditions. The multilayer coatings were optimized by multiple deposition conditions and were characterized by multi-methods. It was proved that they are suitable for tribological applications with this alloy under extreme conditions. This paper addresses the performance of these coatings through tool wear tests and analysis. This performance was compared with that obtained in standard machining conditions used in the aerospace industry, which include flood metalworking fluids and uncoated cemented carbide tools. The results show that the application of a multilayer coating can improve significantly the tool life under cryogenic cooling conditions compared to the flood conditions. 33 % improvement of tool life was found under cryogenic cooling conditions when comparing this coating to the uncoated one. A statistical analysis shows a strong correlation between tool wear and the machining forces. This analysis also permitted to build models for predicting tool wear in function of measured forces.
{"title":"Performance of new cutting tool multilayer coatings for machining Ti-6Al-4V titanium alloy under cryogenic cooling conditions","authors":"Y. Zhang , J.C. Outeiro , C. Nouveau , B. Marcon , L.A. Denguir","doi":"10.1016/j.aime.2025.100165","DOIUrl":"10.1016/j.aime.2025.100165","url":null,"abstract":"<div><div>Cr/CrN/AlCrN multilayer coatings were recently developed to meet the high challenges of machining Ti-6Al-4V alloy under cryogenic cooling conditions. The multilayer coatings were optimized by multiple deposition conditions and were characterized by multi-methods. It was proved that they are suitable for tribological applications with this alloy under extreme conditions. This paper addresses the performance of these coatings through tool wear tests and analysis. This performance was compared with that obtained in standard machining conditions used in the aerospace industry, which include flood metalworking fluids and uncoated cemented carbide tools. The results show that the application of a multilayer coating can improve significantly the tool life under cryogenic cooling conditions compared to the flood conditions. 33 % improvement of tool life was found under cryogenic cooling conditions when comparing this coating to the uncoated one. A statistical analysis shows a strong correlation between tool wear and the machining forces. This analysis also permitted to build models for predicting tool wear in function of measured forces.</div></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":"10 ","pages":"Article 100165"},"PeriodicalIF":3.9,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}