Effect of partitioning process on microstructure and mechanical properties of 301 austenitic stainless steel

doi:10.13251/j.issn.0254-6051.2020.02.027

Abstract

Abstract:

A new heat treatment process of quenching and partitioning was proposed to replace the cold deformation hardening process, so as to improve the mechanical properties of metastable austenitic stainless steel. Taking 301 stainless steel as the research object, the effect of partitioning heat treatment processes on its microstructure and mechanical properties was studied by using the metallographic microscope, scanning electron microscope, X-ray diffractometer, ferrite measuring instrument, universal test machine and hardness tester. The results show that the microstructure of the 301 metastable austenitic stainless steel is mainly composed of martensite, austenite and trace carbide after different quenching-partitioning treatments; the mechanical properties are not sensitive enough to the partitioning temperature, but continue to be optimized with the extension of the partitioning time. After partitioning at 450 ℃ for 30 min, the comprehensive mechanical properties of the steel are optimal, and the yield strength, tensile strength, elongation and hardness are 432.37 MPa, 1212 MPa, 44.28% and 193.16 HV0.2, respectively.

Key words: quenching-partitioning, metastable austenitic stainless steel, microstructure, mechanical properties

CLC Number:

TG161

Li Yunong, Zou Dening, Zhou Yuqing, Pang Yang, Zhao Bifang. Effect of partitioning process on microstructure and mechanical properties of 301 austenitic stainless steel[J]. HTM, 2020, 45(2): 138-142.

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