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| Effect of Quenched-tempered Heat Treatment on Microstructure and Precipitation of High Strength Low Alloy Steel Containing Copper After Being Hot Rolled at Different Temperatures |
WANG Henglin1, DING Hanlin1( ), CHAI Feng2, LUO Xiaobing2, WANG Zijian1, XIANG Chongchen1 |
1.School of Iron and Steel, Soochow University, Suzhou 215006, China
2.Department of Structure Steels, Central Iron and Steel Research Institute, Beijing 100081, China |
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Cite this article:
WANG Henglin, DING Hanlin, CHAI Feng, LUO Xiaobing, WANG Zijian, XIANG Chongchen. Effect of Quenched-tempered Heat Treatment on Microstructure and Precipitation of High Strength Low Alloy Steel Containing Copper After Being Hot Rolled at Different Temperatures. Chinese Journal of Materials Research, 2025, 39(6): 401-412.
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Abstract The effect of heat treatments including quenching and tempering on the microstructure and mechanical properties of Cu-bearing high strength low alloy steel after being hot rolled at different temperatures were studied by SEM, TEM, STEM-HAADF and SASX. The results show that after being hot rolled at different temperatures, the test steels presented a microstructure of ferrite + bainite, however, which after quenching and tempering transformed to tempered martensite and a large amount of dispersed nano precipitates as their primary microstructure characteristics. The nano precipitates mainly consist of Cu-rich particles and Cr carbides. The results of TEM observation show that two types of precipitation modes, i.e. 9R precipitates with or without twins, can be found for the precipitation of Cu-rich particles in the test steel. The ambient temperature yield strength and low temperature impact toughness (especially at -84 oC) of the test steel can be significantly improved by quenching and tempering treatment, while the ultimate tensile strength is slightly decreased. The improvement in comprehensive mechanical properties of the test steel may be mainly ascribed to the precipitation of Cu-rich particles.
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Received: 31 May 2024
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| Fund: National Natural Science Foundation of China(52174367);Postgraduate Research & Practice Innovation Program of Jiangsu Province(KYCX23_3239) |
Corresponding Authors:
DING Hanlin, Tel: 18896736263, E-mail: dinghanlin@suda.edu.cn
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