Research progress on microstructure regulation and strengthening and toughening mechanism of medium Mn steel

doi:10.13251/j.issn.0254-6051.2023.04.005

Abstract

Abstract: With the rapid development of automobile industry, higher requirements are put forward for the comprehensive performance of automobile steel. High strength and ductility and low alloy are the main targets of modern automobile steel development. Research status of manganese steel with heterostructure at home and abroad was mainly introduced, and the effects of alloying elements and critical annealing process on microstructure were systematically summarized. The strengthening mechanism of manganese steel in heterostructure was analyzed. On the basis of the traditional strengthening mechanism, the strength and elongation of medium manganese steel were greatly improved by the synergistic strengthening of heterostructure through heterogeneous deformation induced (HDI) strengthening, multi-stage transformation induced plasticity (TRIP) effect and TRIP/TWIP comprehensive effect. Finally, the problems to be solved in the development of the heterogeneous medium manganese steel were put forward.

Key words: medium Mn steel, microstructure, intercritic annealing, synergistic strengthening

CLC Number:

TG142.1

Du Yifei, Yan Jiahe, Feng Yunli. Research progress on microstructure regulation and strengthening and toughening mechanism of medium Mn steel[J]. Heat Treatment of Metals, 2023, 48(4): 28-34.

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