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G. Tressia¹, L.H. Dias Alves², H. Goldenstein³, C.R. Grandini⁴, M. Mohtadi-Bonab⁵ and M. Masoumi⁶

¹ITV, Instituto Tecnológico Vale, Ouro Preto, Brazil
²Industrial Engineering Department, Federal University of Juiz de Fora, Brazil
³Department of Metallurgical and Material Engineering, University of São Paulo, Brazil
⁴Laboratório de Anelasticidade e Biomateriais, Universidade Estadual Paulista, Bauru, Brazil
⁵Department of Mechanical Engineering, University of Bonab, Iran
⁶Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Santo Andre, Brazil

doi:10.4203/ccc.7.20.2

G. Tressia, L.H. Dias Alves, H. Goldenstein, C.R. Grandini, M. Mohtadi-Bonab, M. Masoumi, "Optimizing Pearlitic Rail Steel Durability: Low-Temperature Annealing and Nanoscale Carbide Innovations", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 20.2, 2024, doi:10.4203/ccc.7.20.2

Keywords: pearlitic steel, nanoscale carbide formation, wear resistance improvement, rail steel durability, rail, movable crossing.

Abstract

This study investigates the impact of low-temperature annealing treatment at 200 degrees Celsius on the wear resistance and mechanical properties of eutectoid pearlitic steel, commonly used in railway applications. Our research primarily focused on understanding the microstructural changes and their correlation with mechanical hardness and wear resistance. Microhardness testing indicated that the hardness of the initial pearlitic microstructure increased from 370 HV to 400 HV following the low-temperature annealing treatment. This increase in hardness was linked to a substantial improvement in wear resistance, evidenced by a 27 percent decrease in wear rate. High-resolution Transmission Electron Microscopy analysis post-treatment revealed the emergence of nanoscale transition carbides. These needle-type transition carbides, with a hexagonal structure, contributed to an increased hardness of the pearlitic structure. Our findings suggest that the low-temperature annealing process not only enhances the hardness and wear resistance of pearlitic steel but also induces favourable microstructural changes that could significantly extend the service life of railway components.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 7 PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 20.2 Optimizing Pearlitic Rail Steel Durability: Low-Temperature Annealing and Nanoscale Carbide Innovations G. Tressia¹, L.H. Dias Alves², H. Goldenstein³, C.R. Grandini⁴, M. Mohtadi-Bonab⁵ and M. Masoumi⁶ ¹ITV, Instituto Tecnológico Vale, Ouro Preto, Brazil ²Industrial Engineering Department, Federal University of Juiz de Fora, Brazil ³Department of Metallurgical and Material Engineering, University of São Paulo, Brazil ⁴Laboratório de Anelasticidade e Biomateriais, Universidade Estadual Paulista, Bauru, Brazil ⁵Department of Mechanical Engineering, University of Bonab, Iran ⁶Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas, Universidade Federal do ABC, Santo Andre, Brazil doi:10.4203/ccc.7.20.2 Full Bibliographic Reference for this paper G. Tressia, L.H. Dias Alves, H. Goldenstein, C.R. Grandini, M. Mohtadi-Bonab, M. Masoumi, "Optimizing Pearlitic Rail Steel Durability: Low-Temperature Annealing and Nanoscale Carbide Innovations", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 20.2, 2024, doi:10.4203/ccc.7.20.2 Keywords: pearlitic steel, nanoscale carbide formation, wear resistance improvement, rail steel durability, rail, movable crossing. Abstract This study investigates the impact of low-temperature annealing treatment at 200 degrees Celsius on the wear resistance and mechanical properties of eutectoid pearlitic steel, commonly used in railway applications. Our research primarily focused on understanding the microstructural changes and their correlation with mechanical hardness and wear resistance. Microhardness testing indicated that the hardness of the initial pearlitic microstructure increased from 370 HV to 400 HV following the low-temperature annealing treatment. This increase in hardness was linked to a substantial improvement in wear resistance, evidenced by a 27 percent decrease in wear rate. High-resolution Transmission Electron Microscopy analysis post-treatment revealed the emergence of nanoscale transition carbides. These needle-type transition carbides, with a hexagonal structure, contributed to an increased hardness of the pearlitic structure. Our findings suggest that the low-temperature annealing process not only enhances the hardness and wear resistance of pearlitic steel but also induces favourable microstructural changes that could significantly extend the service life of railway components. download the full-text of this paper (PDF, 14 pages, 968 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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