Effect of sensitization temperature on precipitation behavior and mechanical properties of high carbon austenitic stainless steel

doi:10.13251/j.issn.0254-6051.2022.12.020

Abstract

Abstract: Effect of sensitization temperature on quantity, morphology and distribution of precipitates in a high carbon austenitic stainless steel was studied by means of metallographic microscope, scanning electron microscope, energy dispersive spectrometer and transmission electron microscope. The effect of precipitate on mechanical properties of the tested steel at different sensitization temperatures was analyzed by means of tensile testing machine, impact testing machine and Brinell hardness tester. The results show that microstructure of the specimens sensitized at different temperatures is austenite, while with the increase of sensitization temperature, the precipitation of Cr-rich carbides on the austenite grain boundaries increases and exists in granular and strip forms, and the size of precipitates on the grain boundaries is in the range of 100-400 nm. After sensitizing treatment at 650 ℃ for 2 h, the strength and toughness of the specimen match well, and the comprehensive mechanical properties are excellent.

Key words: sensitization treatment, high carbon austenitic stainless steel, precipitates, mechanical properties

CLC Number:

TG506.7⁺1

Xing Mengnan, Zhang Haiming, Sui Songyan, Hu Xinming, Ouyang Xin, Wang Chu, Jia Chuntang, Liu Chenxi. Effect of sensitization temperature on precipitation behavior and mechanical properties of high carbon austenitic stainless steel[J]. Heat Treatment of Metals, 2022, 47(12): 115-119.

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