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Volume 14
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10.3390/ma14237461
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Article

Strengthening Mechanism and Carbide Precipitation Behavior of Nb-Mo Microalloy Medium Mn Steel

by
Chunquan Liu
1,*,
Fen Xiong
1,
Yong Wang
1,
Yuxin Cao
1,
Xinbin Liu
1,
Zhengliang Xue
2,*,
Qichun Peng
2 and
Longsheng Peng
3
1
Hunan Institute of Technology, Hengyang 421002, China
2
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
3
Hunan Lifang Roll Co., Ltd., Hengyang 421600, China
*
Authors to whom correspondence should be addressed.
Materials 2021, 14(23), 7461; https://doi.org/10.3390/ma14237461
Submission received: 1 November 2021 / Revised: 26 November 2021 / Accepted: 1 December 2021 / Published: 5 December 2021
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Abstract

This study investigates the strengthening mechanism and carbide precipitation behavior of medium Mn steel with Nb-Mo microalloy after cyclic quenching and austenite reverse transformation treatment. The results show that the Nb/Mo element not only precipitates (Nb,Mo)C in the grains, hindering the movement of dislocations and increases the strength, but also segregates at the austenite/ferrite grain boundary, thus delaying the transformation from austenite to ferrite. In addition, a large amount of nano-scale cementite is retained after cyclic quenching and austenite reverse transformation, which has a positive effect on the proportion of retained austenite in medium Mn steel. Moreover, the carbides with small size and low Mn content are dissolved, and the decomposed C and Mn content are beneficial to the nucleation of austenite during the intercritical annealing process at a temperature of 690 °C.
Keywords: medium Mn steel; strength mechanism; nanometer-sized carbide; precipitation medium Mn steel; strength mechanism; nanometer-sized carbide; precipitation

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MDPI and ACS Style

Liu, C.; Xiong, F.; Wang, Y.; Cao, Y.; Liu, X.; Xue, Z.; Peng, Q.; Peng, L. Strengthening Mechanism and Carbide Precipitation Behavior of Nb-Mo Microalloy Medium Mn Steel. Materials 2021, 14, 7461. https://doi.org/10.3390/ma14237461

AMA Style

Liu C, Xiong F, Wang Y, Cao Y, Liu X, Xue Z, Peng Q, Peng L. Strengthening Mechanism and Carbide Precipitation Behavior of Nb-Mo Microalloy Medium Mn Steel. Materials. 2021; 14(23):7461. https://doi.org/10.3390/ma14237461

Chicago/Turabian Style

Liu, Chunquan, Fen Xiong, Yong Wang, Yuxin Cao, Xinbin Liu, Zhengliang Xue, Qichun Peng, and Longsheng Peng. 2021. "Strengthening Mechanism and Carbide Precipitation Behavior of Nb-Mo Microalloy Medium Mn Steel" Materials 14, no. 23: 7461. https://doi.org/10.3390/ma14237461

APA Style

Liu, C., Xiong, F., Wang, Y., Cao, Y., Liu, X., Xue, Z., Peng, Q., & Peng, L. (2021). Strengthening Mechanism and Carbide Precipitation Behavior of Nb-Mo Microalloy Medium Mn Steel. Materials, 14(23), 7461. https://doi.org/10.3390/ma14237461

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