Effect of deep cryogenic treatment on microstructure and corrosion resistance of 440C martensitic stainless steel

doi:10.13251/j.issn.0254-6051.2022.08.025

Abstract

Abstract: Effect of deep cryogenic treatment on microstructure and corrosion resistance of 440C martensitic stainless steel was investigated. The results show that the hardness of the 440C stainless steel can be increased by 2.3 HRC after liquid nitrogen cryogenic treatment, the retained austenite content is reduced by 11.7%, and there is no obvious pitting on the surface after 72 h neutral salt spray test. The retained austenite content of the 440C stainless steel increases significantly when the room temperature retention time is more than 2 h after quenching, and the hardness and corrosion resistance decrease. It is suggested that the retention time at room temperature after quenching is less than 2 h if the 440C steel is subjected to liquid nitrogen cryogenic treatment.

Key words: 440C martensitic stainless steel, deep cryogenic treatment, retained austenite, corrosion resistance

CLC Number:

TG156

Li Huidong, Zhang Qinyi, Liu Wei, Sun Wei, Wu Dong. Effect of deep cryogenic treatment on microstructure and corrosion resistance of 440C martensitic stainless steel[J]. Heat Treatment of Metals, 2022, 47(8): 152-157.

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