Preparation and mechanical properties of 304 stainless steel with heterogeneous lamella structure

doi:10.13251/j.issn.0254-6051.2022.02.016

Abstract

Abstract: 304 austenitic stainless steel with heterogeneous lamella structure (HLS) was fabricated by deformation induced martensite annealing reversion process. Microstructure was characterized by scanning electron microscope (SEM) and phase composition was analyzed by means of X-ray diffractometer (XRD). The mechanical properties of the 304 stainless steel with different grain sizes were studied systematically by means of quasi-static uniaxial tensile test at room temperature. The results show that after hot rolling with deformation of 34%, cold rolling with deformation of 75% and annealing at 700 ℃ for 12 min, the martensite in the tested steel reversely transforms to austenite, and part of the retained austenite is recrystallized. The original coarse grain structure is morphed into heterogeneous lamella structure, which is composed of nano/ultrafine grains, a proper amount of recrystallized grain clusters and retained austenite grains. Recrystallized grain clusters and retained austenite grains are sandwiched by nano/ultrafine grains. It is especially noted that a high yield strength of 940.1 MPa and a good percentage total extension at fracture of 43.1% can be simultaneously obtained for the HLS specimen with superior strength-ductility synergy.

Key words: 304 stainless steel, heterogeneous lamella structure(HLS), microstructure, mechanical properties, work hardening

CLC Number:

TG142.1

Yu Chonghao, Liu Jia, Deng Xiangtao, Wang Zhaodong. Preparation and mechanical properties of 304 stainless steel with heterogeneous lamella structure[J]. Heat Treatment of Metals, 2022, 47(2): 86-90.

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