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

• Autorzy: Kim Hyo-Seong , Kang Moonseok , Park Minha , Kim Byung Jun , Kim Yong-Shin , Lee Tae Young , Kim Byoungkoo , Ahn Yong-Sik

Identyfikatory

DOI

10.24425/amm.2024.147797

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

hot rolling; rolling reduction; toughness; medium carbon steel; EBSD

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2024
• Tom: Vol. 69, iss. 1
• Strony: 113--116
• Opis fizyczny: Bibliogr. 11 poz., fot., rys., tab.

Twórcy

autor

Kim Hyo-Seong

• Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea
• Pukyong National University, Department of Materials Science and Engineering, 48547, Busan, Republic of Korea
• HD Korea Shipbuilding & Offshore Engineering, 44032, Ulsan, Republic of Korea

• https://orcid.org/0000-0002-9965-5925

autor

Kang Moonseok

• Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0002-8208-2438

autor

Park Minha

• Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0001-6229-185X

autor

Kim Byung Jun

• Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0002-7205-0045

autor

Kim Yong-Shin

• KATEM, 51395, Changwon, Republic of Korea

autor

Lee Tae Young

• KATEM, 51395, Changwon, Republic of Korea

autor

Kim Byoungkoo

• Korea Institute of Industrial Technology, 46938, Busan, Republic of Korea

• https://orcid.org/0000-0002-5392-5862

autor

Ahn Yong-Sik

• Pukyong National University, Department of Materials Science and Engineering, 48547, Busan, Republic of Korea

• https://orcid.org/0000-0002-5250-1689

Bibliografia

• [1] H.-S. Kim, M. Jo, J.Y. Park, B.J. Kim, H.C. Kim, D. Nam, B. Kim, Y.-S. Ahn, Mater. Sci. Eng. A. 857, 144125 (2022).
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• [7] E.I. Poliak, Procedia Manuf. 50, 362-367 (2020).
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• [9] P. Thirathipviwat, G. Song, J. Bednarcik, U. Kühn, T. Gemming, K. Nielsch, J. Han, Compositional complexity dependence of dislocation density and mechanical properties in high entropy alloy systems, Prog. Nat. Sci.: Mater. 30 (4), 545-551 (2020).
• [10] H.-T.J. No-Jin Park, Texture Analysis Program System, Seoul 2011.
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Uwagi

The materials of this study was supported by the “Development Break Disk for KTX San Cheun Korean Type High-Speed Train” project of the Ministry of SMEs and Startups’ Purchase Conditional New Product Development Project [grant number SE210021]. And the analysis device and hire was supported by the “Development of 100 Ton or More Eccentric Drive Shaft Manufacturing Technology for Ultra-Large Industrial Machinery to Enter the Global Market” project of the Ministry of Trade, Industry and Energy’s Global Flagship Industry Quality Response Root Technology Development Project [grant number KM220140].