Effect of quenching temperature on microstructure and precipitation behavior of 40Si2Ni2CrMoV steel

doi:10.13251/j.issn.0254-6051.2022.10.023

Abstract

Abstract: Microstructure and mechanical properties of 40Si2Ni2CrMoV steel quenched at different temperatures (840, 860, 880, 900 ℃) and tempered at 300 ℃were studied by means of OM, SEM and TEM, and the precipitates in the steel were qualitatively and quantitatively characterized by phase analysis method. The results show that when quenched at 800-900 ℃, the microstructure of the tested steel is lath martensite and shows a trend of first refining and then coarsening with the increase of quenching temperature. When the quenching temperature is 880 ℃, the steel has the finest and most uniform microstructure, and the precipitates are dispersed in the martensite matrix. As the quenching temperature increases, the precipitates gradually dissolve into the matrix. Combining with the mechanical properties, it is considered that 880 ℃ is a suitable quenching temperature for the tested steel.

Key words: quenching temperature, 40Si2Ni2CrMoV steel, microstructure, precipitate

CLC Number:

TG156.5

Zhang Weifeng, He Xiaofei, Yu Wenchao, Li Li, Wang Maoqiu. Effect of quenching temperature on microstructure and precipitation behavior of 40Si2Ni2CrMoV steel[J]. Heat Treatment of Metals, 2022, 47(10): 139-146.

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