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Influence of morphological parameter on the mechanical properties in a heterostructured medium Mn steel

Zhang Yu, Li Huaying, Zhou Xuedong, Jiang Zhouhua, Ding Hua

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 3

art. no. e189, 2023

The heterostructured medium Mn steels with different volume fractions of heterostructure are fabricated via partially austenite reversed transformation (PART), and the influence of morphological parameter on the mechanical properties of the investigated steel is discussed. The PART samples exhibit the enhanced yield strength and ultimate tensile strength without sacrificing the ductility in comparison with their homogeneous counterpart. The double heterogeneities of microstructure and composition are found in the PART samples, which should be responsible for the enhancement in the mechanical properties. The yield strength and the ultimate tensile strength of the PART samples decrease with the increasing holding time at the partially austenized temperature, which is associated with the enhanced grain size and the elevated volume fraction of the lath-type microstructure.

Effect of High-Temperature Annealing on the Cross-Tension Property of Resistance Spot Welded Medium-Mn Steel

Zhao Bingge, Wang Yuanfang, Sun Chenyu, Ding Kai, Wu Guanzhi, Wei Tao, Pan Hua, Gao Yulai

Archives of Metallurgy and Materials

2022

Vol. 67, iss. 4

1293--1298

As one of the most promising 3rd generation advanced high strength steels (AHSS), medium Mn steels attract much attention because of their exceptional mechanical property and reasonable cost. However, their application in the modern automotive industry is limited by poor weldability. In this study, 7Mn steel was welded by resistance spot welding (RSW), which was followed by high-temperature annealing to increase the cross-tension property. With this effort, enhanced cross-tension strength (CTS) with a partial interfacial fracture (PIF) mode was realized. During the annealing after RSW that produced martensite, austenitization was realized and then evolved into martensite by the following air cooling. This process produced structure homogeneity across the joint. With respect to the RSW joint, martensite remained the dominant structure after annealing while the diffusion of C and Mn solutes was triggered. With the increase of annealing temperature, the diffusion was enhanced, and the grain boundary embrittlement was reduced, leading to higher CTS.