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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.