Fe-Mn-Al-C系低密度钢及其强韧化机制研究进展

doi:10.11896/cldb.21050094

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Abstract With the rapid development of automotive industry, the problems of energy consumption and environmental pollution have been more and more serious, and the development of high-strength and lightweight automotive steel is of great significance to energy saving and emission reduction. The third generation of advanced high-strength steels currently under development include lightweight steels, Q&P (Quenching and partitioning) steels and medium manganese steels (with Mn mass fraction of 5%—10%). Among them, due to the addition of Al elements, Fe-Mn-Al-C low-density high-strength steels get reduced density, while maintaining good mechanical properties, which meets the lightweight requirements of third generation automotive steel. At the same time, owing to the addition of a large amount of Al, Mn and C elements, the smelting and continuous casting, microstructure, deformation mechanism, processing process and application properties of Fe-Mn-Al-C low-density steels are quite different from those of traditional steel grades.
This paper systematically describes the composition design of Fe-Mn-Al-C low-density steels and the role of alloy elements, and introduces the microstructural characteristics of low density steels.The discussion focuses on various strengthening mechanisms of single ferrite, austenitic, austenitic-based dual-phase and ferritic-based dual-phase steels, including solid solution strengthening, fine grain strengthening, precipitation strengthening, and their unique strain hardening mechanisms,such as phase transformation induced plasticity (TRIP), twinning induced plasticity (TWIP), microband induced plasticity (MBIP), shear band induced plasticity (SIP), dynamic slip band refinement (DSBR), etc. The effect of stacking fault energy (SFE) on the deformation mechanism of austenitic steels is summarized. Finally, the study of the strengthening mechanism of Fe-Mn-Al-C low density steels is prospected to provide a reference for the work of subsequent researchers.

Key words： Fe-Mn-Al-C low-density steel strengthening mechanism stacking fault energy microstructure

Published: 10 March 2023 Online: 2023-03-14

CLC number:

TG142.1

Fund:National Natural Science Foundation of China (51674004) and Natural Science Foundation of Anhui Province(2108085ME143).

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	Articles by authors
	LIN Fangmin
	XING Mei
	TANG Lizhi
	WU Xuejun
	ZHANG Xiaofeng
	HUANG Zhenyi

Cite this article:

LIN Fangmin,XING Mei,TANG Lizhi, et al. Research Progress of Fe-Mn-Al-C Low-density Steels and Their Strengthening Mechanisms[J]. Materials Reports, 2023, 37(5): 21050094-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21050094 OR http://www.mater-rep.com/EN/Y2023/V37/I5/21050094

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