Effect of tempering temperature on microstructure and mechanical properties of high nitrogen stainless bearing steel

doi:10.13251/j.issn.0254-6051.2020.11.029

Abstract

Abstract: Annealed high nitrogen stainless bearing steel was subjected to high pressure gas quenching and cryogenic treatment and then tempered at different temperatures and air cooled. The effect of different tempering temperature on microstructure and mechanical properties of the high nitrogen stainless bearing steel was studied by means of optical microscope, X-Ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Rockwell hardness tester and universal material testing machine. The results show that with the tempering temperature increasing from 180 ℃ to 550 ℃, the hardness, tensile strength and yield strength display a trend of increasing after the first falling and then rapidly decreasing. There are no coarse eutectic carbides observed in the structure due to reducing carbon content and increasing nitrogen content in the composition of the tested steel. When the tempering temperature is 500 ℃, the matrix structure is tempered sorbite, and the carbides M₂₃C₆ and nitride Cr₂N are dispersed uniformly and finely. The secondary hardening occurs at 500 ℃, and the strength and hardness reach the peak state, which is related to the strengthening of carbonitride dispersion. Good comprehensive mechanical properties can be obtained by 1050 ℃ high pressure gas quenching for 60 min+cryogenic treatment (-100 ℃×2 h)+500 ℃×2 h air cooling tempering.

Key words: high nitrogen stainless bearing steel, tempering temperature, carbide, nitride, mechanical properties

CLC Number:

TG156

Shi Chengpeng, Liu Ping, Zhang Ke, Li Wei, Yang Qi, Hao Qingguo. Effect of tempering temperature on microstructure and mechanical properties of high nitrogen stainless bearing steel[J]. Heat Treatment of Metals, 2020, 45(11): 157-162.

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