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Volume 14
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10.3390/met14030293
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Article

Low-Temperature Impact Fracture Behavior of Medium Manganese Steel with Bcc-fcc Duplex Microstructures

by
Yu Du
1,2,*,
Xiuhua Gao
2,*,
Xiaonan Wang
1,*,
Hongyan Wu
2,
Chao Sun
3,
Guosheng Sun
4 and
Linxiu Du
2
1
School of Iron and Steel, Soochow University, Suzhou 215021, China
2
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
3
Nanjing Iron & Steel Co., Ltd., Nanjing 210035, China
4
Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
*
Authors to whom correspondence should be addressed.
Metals 2024, 14(3), 293; https://doi.org/10.3390/met14030293
Submission received: 1 February 2024 / Revised: 25 February 2024 / Accepted: 27 February 2024 / Published: 29 February 2024
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Abstract

Impact fracture behavior at low temperatures was investigated in medium manganese steel with bcc-fcc duplex microstructures. The impact energy was above 150 J (−80~20 °C) and the fractography showed dimples for inter-critical annealing at 630 °C (QHA) because of the high retained austenite stability and low martensite dislocation density. The impact energy was from 180 J (20 °C) to 60 J (−80 °C) and the fractography was intergranular for inter-critical annealing at 610 °C (QLA) because of the low stability of RA and carbides precipitated at the prior austenite grain boundaries. The impact energy was below 60 J (−80~20 °C) and the fractography showed cleavage for direct quenching (DQ) because of the high dislocation density of martensite.
Keywords: medium manganese steel; Charpy impact; low-temperature impact fracture behavior; retained austenite medium manganese steel; Charpy impact; low-temperature impact fracture behavior; retained austenite

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MDPI and ACS Style

Du, Y.; Gao, X.; Wang, X.; Wu, H.; Sun, C.; Sun, G.; Du, L. Low-Temperature Impact Fracture Behavior of Medium Manganese Steel with Bcc-fcc Duplex Microstructures. Metals 2024, 14, 293. https://doi.org/10.3390/met14030293

AMA Style

Du Y, Gao X, Wang X, Wu H, Sun C, Sun G, Du L. Low-Temperature Impact Fracture Behavior of Medium Manganese Steel with Bcc-fcc Duplex Microstructures. Metals. 2024; 14(3):293. https://doi.org/10.3390/met14030293

Chicago/Turabian Style

Du, Yu, Xiuhua Gao, Xiaonan Wang, Hongyan Wu, Chao Sun, Guosheng Sun, and Linxiu Du. 2024. "Low-Temperature Impact Fracture Behavior of Medium Manganese Steel with Bcc-fcc Duplex Microstructures" Metals 14, no. 3: 293. https://doi.org/10.3390/met14030293

APA Style

Du, Y., Gao, X., Wang, X., Wu, H., Sun, C., Sun, G., & Du, L. (2024). Low-Temperature Impact Fracture Behavior of Medium Manganese Steel with Bcc-fcc Duplex Microstructures. Metals, 14(3), 293. https://doi.org/10.3390/met14030293

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