中锰钢微观结构调控与强韧化机制研究进展

汽车工业的迅猛发展对汽车用钢的综合性能提出了更高的要求。高强高塑和低合金是现代汽车用钢开发的主要目标。本文主要介绍了国内外非均质结构中锰钢的研究现状，系统总结了合金元素和临界退火工艺对组织的影响，并对非均质结构中锰钢的强化机制进行了分析。在传统强化机制的基础上，异质结构通过异质变形诱导(HDI)强化、多阶段相变诱导塑性(TRIP)效应与TRIP/TWIP综合效应进行协同强化，大大提高了中锰钢的强度与伸长率。最后提出了非均质结构中锰钢发展中需解决的问题。

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

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.