The low utilization rate of steel slag in China has exposed serious environmental and social problems. In the present work, the basic oxygen furnace (BOF) slag was modified by blast furnace (BF) slag and then beaded by the means of gas quenching. The gas-quenching rate, bead formation rate, physical properties, microscopic characteristics and free lime (f-CaO) of gas-quenched slag beads were analyzed to broaden the utilization of BOF slag. The results show that the more BF slag is added, the higher the gas-quenching rate is, and the lower the bead formation rate becomes. When no BF slag is added, the beads are mainly composed of magnetite, limonite and melilite. After BF slag is added, a large amount of glass phase and a little amount of Ca2 SiO4 and MgO are found in beads. The content of f-CaO beads decreases after the modified slag is gas quenched at high temperature. Moreover, the more BF slag is added, the higher the elimination rate of f-CaO becomes. Considering the industry standard of steel slag sand in China as well as the gas-quenching rate, physical and chemical properties, the gas-quenched steel slag beads with 5 and 15% BF slag better meet the medium sand standard, which can be used as fine aggregate.
{"title":"Preparation and performance analysis of gas-quenched steel slag beads","authors":"Hui Wang, Zhang Wei, Chao Liu, Hongwei Xing, Guo Chen, Yuzhu Zhang","doi":"10.1051/metal/2019073","DOIUrl":"https://doi.org/10.1051/metal/2019073","url":null,"abstract":"The low utilization rate of steel slag in China has exposed serious environmental and social problems. In the present work, the basic oxygen furnace (BOF) slag was modified by blast furnace (BF) slag and then beaded by the means of gas quenching. The gas-quenching rate, bead formation rate, physical properties, microscopic characteristics and free lime (f-CaO) of gas-quenched slag beads were analyzed to broaden the utilization of BOF slag. The results show that the more BF slag is added, the higher the gas-quenching rate is, and the lower the bead formation rate becomes. When no BF slag is added, the beads are mainly composed of magnetite, limonite and melilite. After BF slag is added, a large amount of glass phase and a little amount of Ca2 SiO4 and MgO are found in beads. The content of f-CaO beads decreases after the modified slag is gas quenched at high temperature. Moreover, the more BF slag is added, the higher the elimination rate of f-CaO becomes. Considering the industry standard of steel slag sand in China as well as the gas-quenching rate, physical and chemical properties, the gas-quenched steel slag beads with 5 and 15% BF slag better meet the medium sand standard, which can be used as fine aggregate.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"22 1","pages":"105"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79910782","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 toughness property of the coarse grained heat affected zone had become much worse since the large heat input welding was applied in HSLA for improving welding efficiency and reducing welding costs. Unlike previous investigations of the decreasing fracture toughness with heating time, the toughness of coarse grained heat affected zone increases in long heating time. Based on microstructure and mechanical properties, very remarkable impact toughness was obtained when the t8/5 was 80 s: toughness of 171 J. The toughness improvement initiates not from inclusions but directly from the microstructure of substrate. The microstructure type and inclusion level will compete to dominate the toughness of the 5% Ni steel.
{"title":"Abnormal toughness characteristics and fracture model in simulated welding HAZ of 5%Ni Steel","authors":"D. Min","doi":"10.1051/metal/2020037","DOIUrl":"https://doi.org/10.1051/metal/2020037","url":null,"abstract":"The toughness property of the coarse grained heat affected zone had become much worse since the large heat input welding was applied in HSLA for improving welding efficiency and reducing welding costs. Unlike previous investigations of the decreasing fracture toughness with heating time, the toughness of coarse grained heat affected zone increases in long heating time. Based on microstructure and mechanical properties, very remarkable impact toughness was obtained when the t8/5 was 80 s: toughness of 171 J. The toughness improvement initiates not from inclusions but directly from the microstructure of substrate. The microstructure type and inclusion level will compete to dominate the toughness of the 5% Ni steel.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"28 1","pages":"410"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84512811","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 purpose of the present paper is the diagnostic method of the steady state tearing tests in thin steel sheets. The camera-based contactless system was used in the experimental research. The MATLAB software was used for the processing of real-time images. The data collected in the experiments were used to establish the R-curves in terms of the CTOD (crack tip opening displacement) based resistance curves. The innovative techniques allow extracting a large amount of geometrical information about the entire tearing process and the crack tip development. The steady state tearing was evaluated using automotive steel sheets and the tearing resistance was determined for three grades of thin sheets. The paper describes a comprehensive method of obtaining the material properties necessary for modelling and simulation. The proposed methodology for the testing and evaluation of the steady state tearing is applicable to thin sheets. The measurement method within the test for the determination of the tearing resistance was based on the image analysis.
{"title":"Measurement of the steady state tearing in thin sheets using the contactless system","authors":"Ľ. Ambriško, L. Pešek","doi":"10.1051/metal/2020032","DOIUrl":"https://doi.org/10.1051/metal/2020032","url":null,"abstract":"The purpose of the present paper is the diagnostic method of the steady state tearing tests in thin steel sheets. The camera-based contactless system was used in the experimental research. The MATLAB software was used for the processing of real-time images. The data collected in the experiments were used to establish the R-curves in terms of the CTOD (crack tip opening displacement) based resistance curves. The innovative techniques allow extracting a large amount of geometrical information about the entire tearing process and the crack tip development. The steady state tearing was evaluated using automotive steel sheets and the tearing resistance was determined for three grades of thin sheets. The paper describes a comprehensive method of obtaining the material properties necessary for modelling and simulation. The proposed methodology for the testing and evaluation of the steady state tearing is applicable to thin sheets. The measurement method within the test for the determination of the tearing resistance was based on the image analysis.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"39 1","pages":"310"},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85340248","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 limited life span and huge demand for lithium-ion batteries, environment concerns, and the consumption of rare metals such as lithium and cobalt are the key facts for the worldwide recycling efforts. In this study, the cathode material of discarded lithium-ion batteries was carbothermally reduced using recovered graphite. A comparative evaluation of reduction behavior of single-phase (LiCoO2 ) and mixed-phase (LiCoO2 .LiNi0.5 Mn1.5 O4 .LiMn2 O4 ) cathode materials was investigated under an ambient and inert atmosphere. Processing of single-phase cathode material in inert atmosphere yielded pure metallic cobalt, whereas, higher metallic recoveries and metal purity were obtained by processing of mixed cathode material in ambient conditions. The excellent product obtained under ambient conditions comprises 68% Co, 21% Mn, 2.5% Ni with saturation magnetization: 106 emu/g, and a precursor for the synthesis of cathode material. The process yield is 46.2% and lithium extraction 83%. In terms of metal purity and recovery, graphite was found to be better for reduction than activated charcoal. The process followed is simple, adaptable, and cost-effective for metals recovery from discarded lithium-ion batteries.
{"title":"Evaluation of carbothermic processing for mixed discarded lithium-ion batteries","authors":"Sanjay Pindar, N. Dhawan","doi":"10.1051/metal/2020025","DOIUrl":"https://doi.org/10.1051/metal/2020025","url":null,"abstract":"The limited life span and huge demand for lithium-ion batteries, environment concerns, and the consumption of rare metals such as lithium and cobalt are the key facts for the worldwide recycling efforts. In this study, the cathode material of discarded lithium-ion batteries was carbothermally reduced using recovered graphite. A comparative evaluation of reduction behavior of single-phase (LiCoO2 ) and mixed-phase (LiCoO2 .LiNi0.5 Mn1.5 O4 .LiMn2 O4 ) cathode materials was investigated under an ambient and inert atmosphere. Processing of single-phase cathode material in inert atmosphere yielded pure metallic cobalt, whereas, higher metallic recoveries and metal purity were obtained by processing of mixed cathode material in ambient conditions. The excellent product obtained under ambient conditions comprises 68% Co, 21% Mn, 2.5% Ni with saturation magnetization: 106 emu/g, and a precursor for the synthesis of cathode material. The process yield is 46.2% and lithium extraction 83%. In terms of metal purity and recovery, graphite was found to be better for reduction than activated charcoal. The process followed is simple, adaptable, and cost-effective for metals recovery from discarded lithium-ion batteries.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"183 1","pages":"302"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74653116","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}
In order to utilize niobium concentrate of Bayan Obo effectively, the effect of Nb2 O5 and basicity on the viscosity of CaO-SiO2 -Nb2 O5 -5.0 wt.% CeO2 -5.0 wt.% CaF2 slag system was studied from 1653 to 1813 K in reducing atmosphere by rotating cylinder method. For the same condition, the as-quenched samples were investigated through X-ray diffraction and Raman spectroscopy. The results show that the viscosity, break temperature and activation energy of viscous flow decrease with the increase of Nb2 O5 and basicity. Raman spectra show that the Nb4+ ions exist in the form of [NbO6 ] octahedron with different distortion and little [NbO4 ] tetrahedron in the slags. The Nb2 O5 addition and basicity lower the degree of polymerization, where the complex Si-O network is depolymerized into simple structural units.
{"title":"Influence of Nb2O5 and basicity on the viscosity and structure of CaO-SiO2-Nb2O5-CeO2-CaF2 slag system","authors":"Zhuang Ma, Zengwu Zhao, Wentao Guo, Z. Wang","doi":"10.1051/metal/2020023","DOIUrl":"https://doi.org/10.1051/metal/2020023","url":null,"abstract":"In order to utilize niobium concentrate of Bayan Obo effectively, the effect of Nb2 O5 and basicity on the viscosity of CaO-SiO2 -Nb2 O5 -5.0 wt.% CeO2 -5.0 wt.% CaF2 slag system was studied from 1653 to 1813 K in reducing atmosphere by rotating cylinder method. For the same condition, the as-quenched samples were investigated through X-ray diffraction and Raman spectroscopy. The results show that the viscosity, break temperature and activation energy of viscous flow decrease with the increase of Nb2 O5 and basicity. Raman spectra show that the Nb4+ ions exist in the form of [NbO6 ] octahedron with different distortion and little [NbO4 ] tetrahedron in the slags. The Nb2 O5 addition and basicity lower the degree of polymerization, where the complex Si-O network is depolymerized into simple structural units.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"25 1","pages":"307"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83403924","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 present work is dealing with the modelling of boriding kinetics of AISI 316 steel in the temperature range 1123–1273 K. A diffusion model based on the integral method was used in order to investigate the kinetics of formation of FeB and Fe2 B layers and that of diffusion zone formed on AISI 316 steel by considering the presence of boride incubation times. By using a particular solution of the resulting differential algebraic system, the diffusion coefficients in FeB, Fe2 B and diffusion zone (DZ) were estimated as well as the corresponding values of activation energies. Finally, this present diffusion model has been experimentally validated for two additional boriding conditions (1243 K for 3 and 5 h of treatment). A good concordance was observed between the experimental and the simulated results in terms of layers’ thicknesses.
{"title":"Application of integral method for investigating the boriding kinetics of AISI 316 steel","authors":"Chaima Zouzou, M. Keddam","doi":"10.1051/metal/2020011","DOIUrl":"https://doi.org/10.1051/metal/2020011","url":null,"abstract":"The present work is dealing with the modelling of boriding kinetics of AISI 316 steel in the temperature range 1123–1273 K. A diffusion model based on the integral method was used in order to investigate the kinetics of formation of FeB and Fe2 B layers and that of diffusion zone formed on AISI 316 steel by considering the presence of boride incubation times. By using a particular solution of the resulting differential algebraic system, the diffusion coefficients in FeB, Fe2 B and diffusion zone (DZ) were estimated as well as the corresponding values of activation energies. Finally, this present diffusion model has been experimentally validated for two additional boriding conditions (1243 K for 3 and 5 h of treatment). A good concordance was observed between the experimental and the simulated results in terms of layers’ thicknesses.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"6 1","pages":"202"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73289229","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}
Shun-cheng Wang, Huilan Huang, Zhibo Zhang, K. Zheng
Microstructure uniformity and grain refining efficiency of Al-5Ti-1B alloy rod prepared by powder extruded process and continuous casting and rolling process are investigated in detail by X ray diffractometer, scanning electron microscope and electron probe. It is found that TiB2 and TiAl3 particles are uniformly distributed in the powder extruded Al-5Ti-1B alloy via gas atomization and hot extrusion process. The samples with 0.2% powder extruded Al-5Ti-1B alloy rod holding for 2 min consist of equiaxed grains with an average diameter of 183 µm. Even the holding time extended to 180 min, the average diameter is still stable (229 µm). Al-5Ti-1B alloy rod prepared by the powder extruded process presents better grain refinement and stronger resistance to grain coarsening.
{"title":"Enhancement of microstructure uniformity and grain refining efficiency of Al-5Ti-1B alloy via powder extrusion","authors":"Shun-cheng Wang, Huilan Huang, Zhibo Zhang, K. Zheng","doi":"10.1051/metal/2020069","DOIUrl":"https://doi.org/10.1051/metal/2020069","url":null,"abstract":"Microstructure uniformity and grain refining efficiency of Al-5Ti-1B alloy rod prepared by powder extruded process and continuous casting and rolling process are investigated in detail by X ray diffractometer, scanning electron microscope and electron probe. It is found that TiB2 and TiAl3 particles are uniformly distributed in the powder extruded Al-5Ti-1B alloy via gas atomization and hot extrusion process. The samples with 0.2% powder extruded Al-5Ti-1B alloy rod holding for 2 min consist of equiaxed grains with an average diameter of 183 µm. Even the holding time extended to 180 min, the average diameter is still stable (229 µm). Al-5Ti-1B alloy rod prepared by the powder extruded process presents better grain refinement and stronger resistance to grain coarsening.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"43 1","pages":"621"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73847669","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 paper presents results of physical and numerical modeling of liquid slag entrainment during continuous casting of steel slabs process. The main aim of this work was to determine the critical casting speed and also to specify, which entrainment mechanism is most responsible for transport of slag droplets into steel volume. Physical modeling was based on water-oil model of mould, made on reduced linear scale of Sl = 0.4. In mathematical modeling, Realizable k-e and LES WALE models were used to describe turbulent motion of water and oil, whereas Volume of Fluid model was used to take into account interactions between phases. It was found, that the main cause of slag entrainment is the formation of von Karman vortex in the vicinity of submerged entry nozzle. The results of laboratory experiments and numerical simulations were compared each other. Both method are a useful tools for modeling of slag entrainment. Great agreement was found between laboratory experiments and numerical simulation carried out using LES WALE model, regarding the shape of the oil and oil entrainment as a result of vortex structures formation. However, in the simulation case using Realizable k-e model, the oil entrainment hasn’t been modeled for the conditions under consideration.
本文介绍了钢坯连铸过程液渣夹带的物理和数值模拟结果。这项工作的主要目的是确定临界铸造速度，并确定哪种夹带机制是导致渣滴进入钢体的主要原因。物理建模以模具的水-油模型为基础，按Sl = 0.4的线性缩减比例制作。在数学建模中，采用Realizable k-e和LES WALE模型来描述水和油的湍流运动，而采用Volume of Fluid模型来考虑相之间的相互作用。研究发现，在水下入口喷口附近形成的冯·卡门涡是导致夹渣的主要原因。对室内实验结果和数值模拟结果进行了比较。这两种方法都是模拟夹渣过程的有效工具。利用LES WALE模型进行的数值模拟结果与室内实验结果非常吻合，关于油的形状和油的夹带是涡结构形成的结果。然而，在使用Realizable k-e模型的模拟案例中，并没有根据考虑的条件对携油量进行建模。
{"title":"Physical and numerical modeling of liquid slag entrainment in mould during slabs casting","authors":"M. Bielnicki, J. Jowsa","doi":"10.1051/metal/2020055","DOIUrl":"https://doi.org/10.1051/metal/2020055","url":null,"abstract":"The paper presents results of physical and numerical modeling of liquid slag entrainment during continuous casting of steel slabs process. The main aim of this work was to determine the critical casting speed and also to specify, which entrainment mechanism is most responsible for transport of slag droplets into steel volume. Physical modeling was based on water-oil model of mould, made on reduced linear scale of Sl = 0.4. In mathematical modeling, Realizable k-e and LES WALE models were used to describe turbulent motion of water and oil, whereas Volume of Fluid model was used to take into account interactions between phases. It was found, that the main cause of slag entrainment is the formation of von Karman vortex in the vicinity of submerged entry nozzle. The results of laboratory experiments and numerical simulations were compared each other. Both method are a useful tools for modeling of slag entrainment. Great agreement was found between laboratory experiments and numerical simulation carried out using LES WALE model, regarding the shape of the oil and oil entrainment as a result of vortex structures formation. However, in the simulation case using Realizable k-e model, the oil entrainment hasn’t been modeled for the conditions under consideration.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"160 1","pages":"509"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75786944","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 : 2020-01-01DOI: 10.37904/metal.2020.3667
B. Behrens, J. Uhe, H. Wester, E. Stockburger
A possible alternative to the established press hardening steel 22MnB5 are hot formed martensitic chromium steels. Both strength and ductility of the martensitic chromium steels can reach very high values with appropriate heat treatments. Therefore, car body parts with high crash safety can be produced by hot forming martensitic chromium steels. To identify the formability of a sheet metal, forming limit curves are state of the art. Conventional forming limit curves are recorded at room temperature and do not adequately describe the forming capacity for hot sheet metal forming as it strongly depends on temperature. Therefore, in this paper, an experimental-numerical method for determining quasi-isothermal FLC at high forming temperatures is applied to the martensitic chromium steel AISI 420C (X46Cr13) for forming temperatures between 7501,050 °C according to its process route. The results show an increase of the formability with rising forming temperature with the highest at 1,050 °C.
{"title":"Hot forming limit curves for numerical press hardening simulation of AISI 420C","authors":"B. Behrens, J. Uhe, H. Wester, E. Stockburger","doi":"10.37904/metal.2020.3667","DOIUrl":"https://doi.org/10.37904/metal.2020.3667","url":null,"abstract":"A possible alternative to the established press hardening steel 22MnB5 are hot formed martensitic chromium steels. Both strength and ductility of the martensitic chromium steels can reach very high values with appropriate heat treatments. Therefore, car body parts with high crash safety can be produced by hot forming martensitic chromium steels. To identify the formability of a sheet metal, forming limit curves are state of the art. Conventional forming limit curves are recorded at room temperature and do not adequately describe the forming capacity for hot sheet metal forming as it strongly depends on temperature. Therefore, in this paper, an experimental-numerical method for determining quasi-isothermal FLC at high forming temperatures is applied to the martensitic chromium steel AISI 420C (X46Cr13) for forming temperatures between 7501,050 °C according to its process route. The results show an increase of the formability with rising forming temperature with the highest at 1,050 °C.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"671 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74751091","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 : 2020-01-01DOI: 10.37904/metal.2020.3481
A. Bartkowska, P. Jurči, M. Hudáková, D. Bartkowski, D. Przestacki, M. Kusý, M. Kuřík
The paper presents the study results of microstructure, phase composition, microhardness and wear resistance of Vanadis-6 tool steel after diffusion boriding and laser processing. In this study the diode laser device was used. As a result of diffusion boriding the obtained surface layers were characterized by needlelike microstructure with good cohesion with the substrate but in the subsurface area delamination and porosity could be observed. Therefore the diffusion boronized layer was processed using laser heat treatment. As a result of influence of the laser beam, three zones were obtained. The remelted zone near the surface, next the heat affected zone and finally steel substrate were observed. The newly created microstructure in the remelted zone consisted of boron-martensite eutectic. Microhardness of boronized layer after laser processing in comparison to the one without laser processing was slightly lower and was approx. from 1300 HV0.1 to 1100 HV0.1. It was found that additional advantage of laser processing of boronized layers was the presence of heat affected zone. This led to obtaining a mild microhardness gradient between the surface and the substrate. The boronized layer after laser processing was characterized by higher wear resistance in comparison to one not subjected to this kind of processing.
{"title":"THE INFLUENCE OF LASER PROCESSING ON MICROSTRUCTURE AND SELECTED PROPERTIES OF THE DIFFUSION BORONIZED LAYERS PRODUCED ON TOOL STEEL FOR METAL FORMING","authors":"A. Bartkowska, P. Jurči, M. Hudáková, D. Bartkowski, D. Przestacki, M. Kusý, M. Kuřík","doi":"10.37904/metal.2020.3481","DOIUrl":"https://doi.org/10.37904/metal.2020.3481","url":null,"abstract":"The paper presents the study results of microstructure, phase composition, microhardness and wear resistance of Vanadis-6 tool steel after diffusion boriding and laser processing. In this study the diode laser device was used. As a result of diffusion boriding the obtained surface layers were characterized by needlelike microstructure with good cohesion with the substrate but in the subsurface area delamination and porosity could be observed. Therefore the diffusion boronized layer was processed using laser heat treatment. As a result of influence of the laser beam, three zones were obtained. The remelted zone near the surface, next the heat affected zone and finally steel substrate were observed. The newly created microstructure in the remelted zone consisted of boron-martensite eutectic. Microhardness of boronized layer after laser processing in comparison to the one without laser processing was slightly lower and was approx. from 1300 HV0.1 to 1100 HV0.1. It was found that additional advantage of laser processing of boronized layers was the presence of heat affected zone. This led to obtaining a mild microhardness gradient between the surface and the substrate. The boronized layer after laser processing was characterized by higher wear resistance in comparison to one not subjected to this kind of processing.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72531959","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}
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