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

doi:10.13251/j.issn.0254-6051.2021.06.002

Abstract

Abstract: Microstructure and mechanical properties of high nitrogen stainless bearing steel Cronidur 30 with different tempering temperature were studied and analyzed by universal tensile testing machine, impact testing machine, OM, X-ray diffraction, SEM and TEM, etc. The results show that the microstructure is tempered martensite, carbonitride and retained austenite after tempering at 150-500 ℃. When the tempering temperature exceeds 550 ℃, the microstructure is tempered sorbite, and the precipitated phase gradually gathers and grows. With the tempering temperature increase, the hardness and the tensile strength first decrease, then increase, finally decrease, the impact toughness behaves on the contrary. Secondary hardening occurs because of M₂₃C₆ and Cr₂N increase when tempered at 450 ℃, and the tensile strength is 2133 MPa. After tempered at 400 ℃, the precipitated phases (σ phases) which riched in Cr-Fe-Mo is observed slightly, reduces impact toughness observably. When tempered at 500 ℃, the impact toughness slightly decreases because of the translation of retained austenite.

Key words: high nitrogen stainless bearing steel Cronidur 30, tempering temperature, secondary hardening, σ phases, retained austenite, properties

CLC Number:

TG156.5

Wang Lingqi, He Yanlin, Pan Le. Effect of tempering temperature on microstructure and mechanical properties of high nitrogen stainless bearing steel[J]. Heat Treatment of Metals, 2021, 46(6): 8-13.

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