Pub Date : 2022-11-02DOI: 10.1080/13640461.2023.2172371
Fusheng Pan, Han Lin, Ming-bo Yang, H. Tang
ABSTRACT Microstructures and mechanical properties of AZ91-Sb magnesium alloy fabricated by low-pressure shell casting (LPSC) process in different conditions were investigated. The as-cast alloy exhibited a good internal quality and denser structure. The microstructure of α-Mg phases displayed dendritic feature and fine isolated β-Mg17Al12 particles phases uniformly distributed in the matrix. After the solution treatment at 415°C for 12 h, almost β-Mg17Al12 phases dissolved into the matrix. After ageing treatment at 200°C for 14 h, the LPSC alloy attained the peak hardness with restrained age-hardening kinetics. The discontinuous precipitates initiated at the grain boundaries and then continuous precipitates occurred in the grain interior. The LPSC alloy exhibits higher mechanical properties in both as-cast and heat-treated alloys compared with the gravity casting (GC) process alloy.
{"title":"Microstructure and mechanical properties of LPSC AZ91-Sb magnesium alloy","authors":"Fusheng Pan, Han Lin, Ming-bo Yang, H. Tang","doi":"10.1080/13640461.2023.2172371","DOIUrl":"https://doi.org/10.1080/13640461.2023.2172371","url":null,"abstract":"ABSTRACT Microstructures and mechanical properties of AZ91-Sb magnesium alloy fabricated by low-pressure shell casting (LPSC) process in different conditions were investigated. The as-cast alloy exhibited a good internal quality and denser structure. The microstructure of α-Mg phases displayed dendritic feature and fine isolated β-Mg17Al12 particles phases uniformly distributed in the matrix. After the solution treatment at 415°C for 12 h, almost β-Mg17Al12 phases dissolved into the matrix. After ageing treatment at 200°C for 14 h, the LPSC alloy attained the peak hardness with restrained age-hardening kinetics. The discontinuous precipitates initiated at the grain boundaries and then continuous precipitates occurred in the grain interior. The LPSC alloy exhibits higher mechanical properties in both as-cast and heat-treated alloys compared with the gravity casting (GC) process alloy.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"161 - 168"},"PeriodicalIF":1.4,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44697643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-02DOI: 10.1080/13640461.2022.2149361
D. Dey, Abhijit Bhowmik, A. Biswas
ABSTRACT Present investigation aims at the fabrication of aluminium matrix composites reinforced with different weight percentages of titanium diboride (TiB2) particles and characterisation of their tribological behaviour. Wear tests are carried out on a pin-on-disc tribotester with four different process parameters viz. wt-% of reinforcement, load, sliding velocity and sliding distance. For assessing the tribological performance of composites, grey relational analysis is adopted. The percentage significance of all the parameters on tribological performance has also been evaluated by analysis of variance. Based on Grey-Taguchi approach, the optimal parametric combination is 9 wt-% of reinforcement, 10 N load, 2 m s−1 sliding velocity and 1000 m sliding distance. The optimal parametric combination based on the highest ranking of grey relational grade is validated by a confirmation experiment. Based on the results, it can be concluded that Grey-Taguchi method is an effective tool used for optimising the tribological performance of Al2024-TiB2 composites.
摘要:本研究旨在制备不同重量百分比的二硼化钛(TiB2)颗粒增强铝基复合材料，并表征其摩擦学性能。在销盘式摩擦试验机上进行了磨损试验，试验采用了四种不同的工艺参数，即增强率、载荷、滑动速度和滑动距离。采用灰色关联分析法对复合材料的摩擦学性能进行评价。所有参数对摩擦学性能的百分比显著性也通过方差分析进行了评估。基于gray - taguchi方法，优化参数组合为9 wt-%配筋、10 N荷载、2 m s - 1滑动速度和1000 m滑动距离。通过验证实验验证了基于灰色关联度最高排序的最优参数组合。结果表明，gray - taguchi方法是优化Al2024-TiB2复合材料摩擦学性能的有效工具。
{"title":"Tribological performance Optimization of Al2024-TiB2 composites using Grey-Taguchi approach","authors":"D. Dey, Abhijit Bhowmik, A. Biswas","doi":"10.1080/13640461.2022.2149361","DOIUrl":"https://doi.org/10.1080/13640461.2022.2149361","url":null,"abstract":"ABSTRACT Present investigation aims at the fabrication of aluminium matrix composites reinforced with different weight percentages of titanium diboride (TiB2) particles and characterisation of their tribological behaviour. Wear tests are carried out on a pin-on-disc tribotester with four different process parameters viz. wt-% of reinforcement, load, sliding velocity and sliding distance. For assessing the tribological performance of composites, grey relational analysis is adopted. The percentage significance of all the parameters on tribological performance has also been evaluated by analysis of variance. Based on Grey-Taguchi approach, the optimal parametric combination is 9 wt-% of reinforcement, 10 N load, 2 m s−1 sliding velocity and 1000 m sliding distance. The optimal parametric combination based on the highest ranking of grey relational grade is validated by a confirmation experiment. Based on the results, it can be concluded that Grey-Taguchi method is an effective tool used for optimising the tribological performance of Al2024-TiB2 composites.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"144 - 151"},"PeriodicalIF":1.4,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44872613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-02DOI: 10.1080/13640461.2023.2172519
Han Ye, Quan Li, Jia Gu, Xiang-jie Yang, Mengxin Long, R. Zeng, Ming-Hsuan Yang, Y. Gao, Shilin Li, Fusheng Zhu
ABSTRACT For the current, the thermal analysis sample cups used to predict the carbon and silicon content of cast iron melts are relatively large and take a long time for each measurement, a smaller cylindrical thermal analysis sample cup with an inner diameter of 25 mm and a height of 55 mm was studied for the analysis of carbon and silicon. The thermal analysis system can quickly measure the temperature characteristic values of the liquidus temperature TL and the eutectic temperature TE of the temperature curves related to carbon equivalent, carbon content and silicon content within 2 min, and mathematical models for the prediction of carbon equivalent CEL (3.2–4.7), carbon content C% (3.0–4.0%) and silicon content Si% (1.0–2.5%) was established by multiple linear regression in combination with optical emission spectroscopy: We had checked the accuracy, the average error of carbon equivalent and carbon content and silicon content did not exceed 0.05%.
{"title":"Use a smaller cylindrical thermal analysis sample cup to rapidly predict carbon and silicon content in cast iron","authors":"Han Ye, Quan Li, Jia Gu, Xiang-jie Yang, Mengxin Long, R. Zeng, Ming-Hsuan Yang, Y. Gao, Shilin Li, Fusheng Zhu","doi":"10.1080/13640461.2023.2172519","DOIUrl":"https://doi.org/10.1080/13640461.2023.2172519","url":null,"abstract":"ABSTRACT For the current, the thermal analysis sample cups used to predict the carbon and silicon content of cast iron melts are relatively large and take a long time for each measurement, a smaller cylindrical thermal analysis sample cup with an inner diameter of 25 mm and a height of 55 mm was studied for the analysis of carbon and silicon. The thermal analysis system can quickly measure the temperature characteristic values of the liquidus temperature TL and the eutectic temperature TE of the temperature curves related to carbon equivalent, carbon content and silicon content within 2 min, and mathematical models for the prediction of carbon equivalent CEL (3.2–4.7), carbon content C% (3.0–4.0%) and silicon content Si% (1.0–2.5%) was established by multiple linear regression in combination with optical emission spectroscopy: We had checked the accuracy, the average error of carbon equivalent and carbon content and silicon content did not exceed 0.05%.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"181 - 186"},"PeriodicalIF":1.4,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47021036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-02DOI: 10.1080/13640461.2023.2173855
S. Kotiadis, A. Zimmer, A. Elsayed
ABSTRACT Aluminium alloys with Fe and Ni show potential as high castability alloys with high strength and high electrical/thermal conductivities for electric vehicle powertrains. Permanent mould castings of Al-Fe-Ni alloys with additions of Mg and Si were prepared to assess hot tearing susceptibility and mechanical properties. The electrical conductivity of the Al-Fe-Ni alloys was measured, and the Wiedemann-Franz law was used to estimate the thermal conductivity. The results show that a hot tear resistant Al-Fe-Ni alloy with composition Al-1.2Fe-0.5Mg-0.3Si-0.2Ni had an electrical conductivity of 50.91 ±0.29%IACS with yield strength, ultimate tensile strength, and elongation of 60.5 MPa, 141 MPa and 7.9%, respectively. The microstructure of the Al-Fe-Ni alloys contained primary Al, Al9FeNi and Mg2Si. The short freezing ranges and fine intermetallics allowed for good castability. The prepared Al-Fe-Ni alloys are potential new castable Al alloys that have thermal and electrical conductivity nearing wrought (6061 and 6101) compositions.
{"title":"Hot tearing and mechanical properties of high electrical and thermal conductivity Al-Fe-Mg-Si-Ni Alloys","authors":"S. Kotiadis, A. Zimmer, A. Elsayed","doi":"10.1080/13640461.2023.2173855","DOIUrl":"https://doi.org/10.1080/13640461.2023.2173855","url":null,"abstract":"ABSTRACT Aluminium alloys with Fe and Ni show potential as high castability alloys with high strength and high electrical/thermal conductivities for electric vehicle powertrains. Permanent mould castings of Al-Fe-Ni alloys with additions of Mg and Si were prepared to assess hot tearing susceptibility and mechanical properties. The electrical conductivity of the Al-Fe-Ni alloys was measured, and the Wiedemann-Franz law was used to estimate the thermal conductivity. The results show that a hot tear resistant Al-Fe-Ni alloy with composition Al-1.2Fe-0.5Mg-0.3Si-0.2Ni had an electrical conductivity of 50.91 ±0.29%IACS with yield strength, ultimate tensile strength, and elongation of 60.5 MPa, 141 MPa and 7.9%, respectively. The microstructure of the Al-Fe-Ni alloys contained primary Al, Al9FeNi and Mg2Si. The short freezing ranges and fine intermetallics allowed for good castability. The prepared Al-Fe-Ni alloys are potential new castable Al alloys that have thermal and electrical conductivity nearing wrought (6061 and 6101) compositions.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"187 - 205"},"PeriodicalIF":1.4,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48168594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-23DOI: 10.1080/13640461.2022.2115724
Muhammad Shahzad Aslam
ABSTRACT The existing sequential probability ratio under classical statistics is applied for testing the null hypothesis when all observations in the data are exact, precise and uncertain. In complex situations, the observations in the data may be imprecise and noted in the intervals. In this case, the existing sequential probability ratio cannot be applied for testing the hypothesis. This paper introduces the sequential probability ratio under neutrosophic statistics to deal with the data having imprecise and uncertain data. The statistic of the proposed test is introduced and applied for testing the hypothesis of alloy melting points data. From the alloy data analysis, simulation study and comparative study, it is concluded that the proposed neutrosophic sequential probability is adequate, informative and suitable to be applied in uncertainty.
{"title":"Alloy melting points data analysis using uncertainty-based sequential probability ratio test","authors":"Muhammad Shahzad Aslam","doi":"10.1080/13640461.2022.2115724","DOIUrl":"https://doi.org/10.1080/13640461.2022.2115724","url":null,"abstract":"ABSTRACT The existing sequential probability ratio under classical statistics is applied for testing the null hypothesis when all observations in the data are exact, precise and uncertain. In complex situations, the observations in the data may be imprecise and noted in the intervals. In this case, the existing sequential probability ratio cannot be applied for testing the hypothesis. This paper introduces the sequential probability ratio under neutrosophic statistics to deal with the data having imprecise and uncertain data. The statistic of the proposed test is introduced and applied for testing the hypothesis of alloy melting points data. From the alloy data analysis, simulation study and comparative study, it is concluded that the proposed neutrosophic sequential probability is adequate, informative and suitable to be applied in uncertainty.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"139 - 143"},"PeriodicalIF":1.4,"publicationDate":"2022-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49301896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/13640461.2022.2099095
Guangyu Li, Wenming Jiang, Feng Guan, Zeyu Zhang, Junlong Wang, Z. Fan
ABSTRACT The effect of surface morphologies of Al insert, including smooth surface (SS), straight knurling (SK) and hatching knurling (HK) on interfacial microstructure, mechanical properties and fracture behaviour of Al/Mg bimetallic composites by a novel compound casting was studied in this work. The thicknesses of the interface layers of the SK-s and HK-s bimetallic composites, respectively, increased by 11.5% and 4.8% than that of the SS’s composite. The interfacial phase compositions were similar for all the bimetallic composites, mainly consisting of eutectic layer (EU) and intermetallic compound layer (IMC). Therein, the proportion of the EU layer in the entire interface layer for the SK’s and HK’s bimetallic composites was larger than that of the SS’s sample. The EU layer had a lower hardness than the IMC layer. The shear strengths of the SK’s and HK’s bimetallic composites increased by 34.2% and 50.2%, respectively, compared to that of the SS’s bimetallic composite.
{"title":"Interfacial characteristics, mechanical properties and fracture behaviour of Al/Mg bimetallic composites by compound casting with different morphologies of Al insert","authors":"Guangyu Li, Wenming Jiang, Feng Guan, Zeyu Zhang, Junlong Wang, Z. Fan","doi":"10.1080/13640461.2022.2099095","DOIUrl":"https://doi.org/10.1080/13640461.2022.2099095","url":null,"abstract":"ABSTRACT The effect of surface morphologies of Al insert, including smooth surface (SS), straight knurling (SK) and hatching knurling (HK) on interfacial microstructure, mechanical properties and fracture behaviour of Al/Mg bimetallic composites by a novel compound casting was studied in this work. The thicknesses of the interface layers of the SK-s and HK-s bimetallic composites, respectively, increased by 11.5% and 4.8% than that of the SS’s composite. The interfacial phase compositions were similar for all the bimetallic composites, mainly consisting of eutectic layer (EU) and intermetallic compound layer (IMC). Therein, the proportion of the EU layer in the entire interface layer for the SK’s and HK’s bimetallic composites was larger than that of the SS’s sample. The EU layer had a lower hardness than the IMC layer. The shear strengths of the SK’s and HK’s bimetallic composites increased by 34.2% and 50.2%, respectively, compared to that of the SS’s bimetallic composite.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"84 - 101"},"PeriodicalIF":1.4,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44036826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/13640461.2022.2104515
Hongjun Liu, Guoliang Su, Yaming Li
ABSTRACT An extrusion-based additive manufacturing process for investment casting shell mould is introduced in this paper. This process uses silica sol bauxite slurry to build shell mould. The shell mould is made up of thin walls around the casting cavity, and its additive manufacturing process is actually the building process of walls. The effect of process parameters on the dimensional accuracy of the bauxite shell mould was investigated. Taguchi’s design and Analysis of Variance (ANOVA) approach was used to evaluate and optimise the process parameters viz. wall thickness, wall height and filling pattern for dimensional accuracy. The results indicate the wall thickness, filling pattern and wall thickness are the most significant parameters affecting the dimensional accuracy in X, Y and Z directions, respectively. It is suggested that the wall thickness is set as 10 mm and the filling pattern is set as rectilinear for shell mould.
{"title":"Effect of wall structure on the dimensional accuracy of shell mould prepared by slurry extrusion-based additive manufacturing process","authors":"Hongjun Liu, Guoliang Su, Yaming Li","doi":"10.1080/13640461.2022.2104515","DOIUrl":"https://doi.org/10.1080/13640461.2022.2104515","url":null,"abstract":"ABSTRACT An extrusion-based additive manufacturing process for investment casting shell mould is introduced in this paper. This process uses silica sol bauxite slurry to build shell mould. The shell mould is made up of thin walls around the casting cavity, and its additive manufacturing process is actually the building process of walls. The effect of process parameters on the dimensional accuracy of the bauxite shell mould was investigated. Taguchi’s design and Analysis of Variance (ANOVA) approach was used to evaluate and optimise the process parameters viz. wall thickness, wall height and filling pattern for dimensional accuracy. The results indicate the wall thickness, filling pattern and wall thickness are the most significant parameters affecting the dimensional accuracy in X, Y and Z directions, respectively. It is suggested that the wall thickness is set as 10 mm and the filling pattern is set as rectilinear for shell mould.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"102 - 110"},"PeriodicalIF":1.4,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46764770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/13640461.2022.2114669
J. Benavides-Treviño, A. Juárez-Hernández, M. Hernández, N. Garza-Montes-de-Oca, R. Colás
ABSTRACT Manufacturing of plastic goods by rotational moulding relies on aluminium tooling to reduce energy consumption as their thermal and electrical conductivities are enhanced and their weight is reduced. Moulding is carried out at high temperatures, and a considerable amount of energy is consumed by heating up the moulds and hence the interest on the evaluation of the thermophysical properties of potential aluminium alloys. This work reports the results of studies conducted on a series of cast Al-Si-Cu alloys that may be used for producing tooling and moulds. The work contemplated the study of solidification and the way into which the microstructure changes with the chemical composition and how these characteristics affect the thermal diffusivity with respect to temperature, chemical composition and microstructure. The results show that thermal diffusivity can be enhanced by modifying their processing and the corresponding microstructural features.
{"title":"Development of cast aluminium alloys for plastic moulding","authors":"J. Benavides-Treviño, A. Juárez-Hernández, M. Hernández, N. Garza-Montes-de-Oca, R. Colás","doi":"10.1080/13640461.2022.2114669","DOIUrl":"https://doi.org/10.1080/13640461.2022.2114669","url":null,"abstract":"ABSTRACT Manufacturing of plastic goods by rotational moulding relies on aluminium tooling to reduce energy consumption as their thermal and electrical conductivities are enhanced and their weight is reduced. Moulding is carried out at high temperatures, and a considerable amount of energy is consumed by heating up the moulds and hence the interest on the evaluation of the thermophysical properties of potential aluminium alloys. This work reports the results of studies conducted on a series of cast Al-Si-Cu alloys that may be used for producing tooling and moulds. The work contemplated the study of solidification and the way into which the microstructure changes with the chemical composition and how these characteristics affect the thermal diffusivity with respect to temperature, chemical composition and microstructure. The results show that thermal diffusivity can be enhanced by modifying their processing and the corresponding microstructural features.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"121 - 129"},"PeriodicalIF":1.4,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43345605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/13640461.2022.2114668
A. C. González-Castillo, C. Garay-Reyes, J. Hernández-Rivera
ABSTRACT This research is focused on the development of a novel medium Mn steel with V-addition (0.14 wt.%), which belongs to the Advanced High Strength Steels (AHSS). In order to predict the equilibrium phases, thermodynamic simulation was used. The microstructure of the as-cast steel was composed of retained austenite, α´-martensite/α-ferrite and a very small amount of ɛ-martensite. To understand the hot flow behaviour of the as-cast steel, hot compression tests were performed at 800°C and 1000°C with a strain rate of 0.83 s−1 and 0.083 s−1, the results were compared to a V-free steel taken from the literature. A significant increase in the applied stress was observed in the samples deformed at 800°C, especially, at the strain rate of 0.083s−1. Finally, to achieve a better understanding of this behaviour, the microstructure of the V-added steel was studied after hot compression tests.
{"title":"High temperature microstructure and mechanical properties of as-cast medium Mn steel with V addition","authors":"A. C. González-Castillo, C. Garay-Reyes, J. Hernández-Rivera","doi":"10.1080/13640461.2022.2114668","DOIUrl":"https://doi.org/10.1080/13640461.2022.2114668","url":null,"abstract":"ABSTRACT This research is focused on the development of a novel medium Mn steel with V-addition (0.14 wt.%), which belongs to the Advanced High Strength Steels (AHSS). In order to predict the equilibrium phases, thermodynamic simulation was used. The microstructure of the as-cast steel was composed of retained austenite, α´-martensite/α-ferrite and a very small amount of ɛ-martensite. To understand the hot flow behaviour of the as-cast steel, hot compression tests were performed at 800°C and 1000°C with a strain rate of 0.83 s−1 and 0.083 s−1, the results were compared to a V-free steel taken from the literature. A significant increase in the applied stress was observed in the samples deformed at 800°C, especially, at the strain rate of 0.083s−1. Finally, to achieve a better understanding of this behaviour, the microstructure of the V-added steel was studied after hot compression tests.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"111 - 120"},"PeriodicalIF":1.4,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45574574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-04DOI: 10.1080/13640461.2022.2093586
Manojkumar V. Sheladiya, S. Acharya, G. Acharya
ABSTRACT In foundries, it becomes necessary to minimise the machining allowance for economic reasons. It will save resources and costs by reducing the energy and expenses incurred on re-melting, machining and tooling. A deeper understanding of the complicated microstructures developed within about 3.5 mm of the mould-metal interface is necessary. The current research work uses a unique experimental design that involves performing surface and subsurface microscopy and spectroscopy at 0.5 mm intervals from the as-cast surface to a depth of up to 3.5 mm for three samples. The objective is on evaluating microstructure for determining graphite flake size, distribution, grouping, pearlite and ferrite percentage, and different elements. All three samples were subjected to a hardness test, which is a measure of machinability. The relationship between hardness as a single response to percentage presence of elements, graphite distribution and pearlite has been established using statistical analysis.
{"title":"Effect of microstructure on the hardness of ASTM A48 class 20 flaked graphite cast iron","authors":"Manojkumar V. Sheladiya, S. Acharya, G. Acharya","doi":"10.1080/13640461.2022.2093586","DOIUrl":"https://doi.org/10.1080/13640461.2022.2093586","url":null,"abstract":"ABSTRACT In foundries, it becomes necessary to minimise the machining allowance for economic reasons. It will save resources and costs by reducing the energy and expenses incurred on re-melting, machining and tooling. A deeper understanding of the complicated microstructures developed within about 3.5 mm of the mould-metal interface is necessary. The current research work uses a unique experimental design that involves performing surface and subsurface microscopy and spectroscopy at 0.5 mm intervals from the as-cast surface to a depth of up to 3.5 mm for three samples. The objective is on evaluating microstructure for determining graphite flake size, distribution, grouping, pearlite and ferrite percentage, and different elements. All three samples were subjected to a hardness test, which is a measure of machinability. The relationship between hardness as a single response to percentage presence of elements, graphite distribution and pearlite has been established using statistical analysis.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"35 1","pages":"73 - 83"},"PeriodicalIF":1.4,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46136909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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