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Open AccessFeature PaperArticle

Effects of Cr and Mo on Mechanical Properties of Hot-Forged Medium Carbon TRIP-Aided Bainitic Ferrite Steels

1
Department of Mechanical Systems Engineering, Graduate School of Science and Technology, Shinshu University, Nagano 380-8553, Japan
2
Department of Production Engineering, Sato Press Co., Ltd., Toyota 473-0933, Japan
3
Department of Mechanical Engineering, Graduate School of Science and Engineering, Ibaraki University, Hitachi 316-8511, Japan
4
Department of Metallurgical Engineering, School of Engineering, OP Jindal University, Raigarh 496109, India
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1066; https://doi.org/10.3390/met9101066
Received: 12 September 2019 / Revised: 27 September 2019 / Accepted: 27 September 2019 / Published: 30 September 2019
In this study, the effects of Cr and Mo additions on mechanical properties of hot-forged medium carbon TRIP-aided bainitic ferrite (TBF) steel were investigated. If 0.5%Cr was added to the base steel with a chemical composition of 0.4%C, 1.5%Si, 1.5%Mn, 0.5%Al, and 0.05%Nb in mass%, the developed steel achieved the best combination of strength and total elongation. The best combination of strength and impact toughness was attained by multiple additions of 0.5%Cr and 0.2%Mo to the base steel. The excellent combination of strength and impact toughness substantially exceeded those of quenched and tempered JIS-SCM420 and 440 steels, although it was as high as those of 0.2%C TBF steels with 1.0%Cr and 0.2%Mo. The good impact toughness was mainly caused by uniform fine bainitic ferrite matrix structure and a large amount of metastable retained austenite. View Full-Text
Keywords: hot-forging; microalloying; TRIP-aided bainitic ferrite steel; retained austenite; tensile property; impact toughness hot-forging; microalloying; TRIP-aided bainitic ferrite steel; retained austenite; tensile property; impact toughness
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Sugimoto, K.-I.; Sato, S.-H.; Kobayashi, J.; Srivastava, A.K. Effects of Cr and Mo on Mechanical Properties of Hot-Forged Medium Carbon TRIP-Aided Bainitic Ferrite Steels. Metals 2019, 9, 1066.

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