回火温度对42CrMo4高强钢力学性能及应力腐蚀敏感性的影响

doi:10.11896/cldb.20040148

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Abstract The effects of tempering temperature on the carbide morphology and distribution in 42CrMo4 microstructure and mechanical properties and stress corrosion sensitivity were researched by the optical microscopy (OM), slow strain tensile testing (SSRT) and transmission electron microscopy (TEM). The results showed that the metallographic structure of 42CrMo4 high-strength steel was tempered sorbite after tempering at 500—650 ℃, with the increase of tempering temperature, the carbide gradually changed from uneven flakes to short rods, and finally became granular and distributed dispersively on the substrate, which was the main reason for the continuous improvement of comprehensive mechanical properties and stress corrosion resistance. As the tempering temperature increased, the impact toughness of 0 ℃ of 42CrMo4 increased and the tensile strength decreased. When the tempering temperature was from 500 ℃ to 600 ℃, the samples had higher stress corrosion sensitivity and under the same heat treatment conditions, the E_H＞E_NaCl, when the tempering temperature was from 620 ℃ to 650 ℃, both E_H and E_NaCl were lower than 25%, which had lower stress corrosion sensitivity.

Key words： 42CrMo4 tempering temperature metallographic microstructure mechanical property stress corrosion slow strain tensile testing

Published: 07 September 2021

CLC number:

TG174

Fund:National Natural Science Foundation Youth Fund of China (51431004) and National Key Research and Development Plan (2016YFB0700404).

About author:: Dubao Zhang,graduated from Nanjing Aerospace University in March 2016 with a master's degree in engineering. After graduating, he joined Plant Life Management Research Center, Suzhou Nuclear Power Research Institute and is mainly engaged in the life assessment of metal materials.
Chengtao Li, member of the Youth Work Committee of the Chinese Society of Corrosion and Protection, and deputy director of life assessment, is mainly engaged in the corrosion mechanism and safety assessment of nuclear power plant materials in high temperature and high pressure environments.

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	ZHANG Dubao
	LI Chengtao
	FANG Kewei
	LUO Kunjie
	WANG Li
	WU Huanchun
	XUE Fei

Cite this article:

ZHANG Dubao,LI Chengtao,FANG Kewei, et al. Effect of Tempering Temperature on Mechanical Properties and Stress Corrosion Sensitivity of 42CrMo4 High-strength Steel[J]. Materials Reports, 2021, 35(16): 16133-16137.

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http://www.mater-rep.com/EN/10.11896/cldb.20040148 OR http://www.mater-rep.com/EN/Y2021/V35/I16/16133

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