Effects of Hot rolling Reduction on Microstructural Evolution and Mechanical Properties of 1.25Cr-1Mo-0.5V-0.3C Steel for High-Speed Rail Brake Discs
In this study, the effect of rolling of 1.25Cr-1Mo-0.5V-0.3C American Iron and Steel Institute 4340 modified steel for highspeed railway brake discs on the microstructure and mechanical properties was investigated. The materials were hot-rolled at 0%, 51%, and 66% reduction ratios, and then analyzed...
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| Format: | Article |
| Language: | English |
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Polish Academy of Sciences
2024-04-01
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| Series: | Archives of Metallurgy and Materials |
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| Online Access: | https://journals.pan.pl/Content/130925/PDF/AMM-2024-1-23-Byoungkoo%20Kim.pdf |
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| author | Hyo-Seong Kim Moonseok Kang Minha Park Byung Jun Kim Yong-Shin Kim Tae Young Lee Byoungkoo Kim Yong-Sik Ahn |
| author_facet | Hyo-Seong Kim Moonseok Kang Minha Park Byung Jun Kim Yong-Shin Kim Tae Young Lee Byoungkoo Kim Yong-Sik Ahn |
| author_sort | Hyo-Seong Kim |
| collection | DOAJ |
| description | In this study, the effect of rolling of 1.25Cr-1Mo-0.5V-0.3C American Iron and Steel Institute 4340 modified steel for highspeed railway brake discs on the microstructure and mechanical properties was investigated. The materials were hot-rolled at 0%, 51%, and 66% reduction ratios, and then analyzed by optical microscopy, scanning electron microscopy, and electron backscattering diffraction (EBSD). needle-shaped ferrite block morphology in bainite varied with the rolling ratio. EBSD analysis reveals dynamic recovery and dynamic recrystallization, affected ferrite block boundaries and dislocation densities during rolling. Mechanical tests showed that hardness, toughness and elongation increase at higher rolling reduction ratio, while strength remained relatively constant. In particular, the impact toughness increased almost twice from the level of 70 J in S1 (0% reduction) to the level of 130 J in S3 (66% reduction). These results showed that the hot rolling can significantly improve the strength and toughness combination of cast brake discs material. |
| format | Article |
| id | doaj-art-8da0ecdb2fc4407cbca34f2c121d5cf0 |
| institution | OA Journals |
| issn | 2300-1909 |
| language | English |
| publishDate | 2024-04-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Metallurgy and Materials |
| spelling | doaj-art-8da0ecdb2fc4407cbca34f2c121d5cf02025-08-20T02:00:52ZengPolish Academy of SciencesArchives of Metallurgy and Materials2300-19092024-04-01vol. 69No 1113116https://doi.org/10.24425/amm.2024.147797Effects of Hot rolling Reduction on Microstructural Evolution and Mechanical Properties of 1.25Cr-1Mo-0.5V-0.3C Steel for High-Speed Rail Brake DiscsHyo-Seong Kim0https://orcid.org/0000-0002-9965-5925Moonseok Kang1https://orcid.org/0000-0002-8208-2438Minha Park2https://orcid.org/0000-0001-6229-185XByung Jun Kim3https://orcid.org/0000-0002-7205-0045Yong-Shin Kim4Tae Young Lee5Byoungkoo Kim6https://orcid.org/0000-0002-5392-5862Yong-Sik Ahn7https://orcid.org/0000-0002-5250-1689Korea Institute of Industrial Technology, 46938, Busan, Republic of KoreaKorea Institute of Industrial Technology, 46938, Busan, Republic of KoreaKorea Institute of Industrial Technology, 46938, Busan, Republic of KoreaKorea Institute of Industrial Technology, 46938, Busan, Republic of KoreaKATEM, 51395, Changwon, Republic of KoreaKATEM, 51395, Changwon, Republic of KoreaKorea Institute of Industrial Technology, 46938, Busan, Republic of KoreaPukyong National University, Department of Materials Science and Engineering, 48547, Busan, Republic of KoreaIn this study, the effect of rolling of 1.25Cr-1Mo-0.5V-0.3C American Iron and Steel Institute 4340 modified steel for highspeed railway brake discs on the microstructure and mechanical properties was investigated. The materials were hot-rolled at 0%, 51%, and 66% reduction ratios, and then analyzed by optical microscopy, scanning electron microscopy, and electron backscattering diffraction (EBSD). needle-shaped ferrite block morphology in bainite varied with the rolling ratio. EBSD analysis reveals dynamic recovery and dynamic recrystallization, affected ferrite block boundaries and dislocation densities during rolling. Mechanical tests showed that hardness, toughness and elongation increase at higher rolling reduction ratio, while strength remained relatively constant. In particular, the impact toughness increased almost twice from the level of 70 J in S1 (0% reduction) to the level of 130 J in S3 (66% reduction). These results showed that the hot rolling can significantly improve the strength and toughness combination of cast brake discs material.https://journals.pan.pl/Content/130925/PDF/AMM-2024-1-23-Byoungkoo%20Kim.pdfhot rollingrolling reductiontoughnessmedium carbon steelebsd |
| spellingShingle | Hyo-Seong Kim Moonseok Kang Minha Park Byung Jun Kim Yong-Shin Kim Tae Young Lee Byoungkoo Kim Yong-Sik Ahn Effects of Hot rolling Reduction on Microstructural Evolution and Mechanical Properties of 1.25Cr-1Mo-0.5V-0.3C Steel for High-Speed Rail Brake Discs Archives of Metallurgy and Materials hot rolling rolling reduction toughness medium carbon steel ebsd |
| title | Effects of Hot rolling Reduction on Microstructural Evolution and Mechanical Properties of 1.25Cr-1Mo-0.5V-0.3C Steel for High-Speed Rail Brake Discs |
| title_full | Effects of Hot rolling Reduction on Microstructural Evolution and Mechanical Properties of 1.25Cr-1Mo-0.5V-0.3C Steel for High-Speed Rail Brake Discs |
| title_fullStr | Effects of Hot rolling Reduction on Microstructural Evolution and Mechanical Properties of 1.25Cr-1Mo-0.5V-0.3C Steel for High-Speed Rail Brake Discs |
| title_full_unstemmed | Effects of Hot rolling Reduction on Microstructural Evolution and Mechanical Properties of 1.25Cr-1Mo-0.5V-0.3C Steel for High-Speed Rail Brake Discs |
| title_short | Effects of Hot rolling Reduction on Microstructural Evolution and Mechanical Properties of 1.25Cr-1Mo-0.5V-0.3C Steel for High-Speed Rail Brake Discs |
| title_sort | effects of hot rolling reduction on microstructural evolution and mechanical properties of 1 25cr 1mo 0 5v 0 3c steel for high speed rail brake discs |
| topic | hot rolling rolling reduction toughness medium carbon steel ebsd |
| url | https://journals.pan.pl/Content/130925/PDF/AMM-2024-1-23-Byoungkoo%20Kim.pdf |
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