Effect of tempering temperature on mechanical properties and fracture morphology of 3Cr3Mo2NiW steel

doi:10.13251/j.issn.0254-6051.2020.06.005

Abstract

Abstract: The changes of mechanical properties and fracture morphology of 3Cr3Mo2NiW steel with tempering temperature were studied. The results show that with the increase of tempering temperature, the hardness of the experimental steel decreases, the toughness increases, and the secondary hardening occurs when tempered at 550 ℃. When the tempering temperature being above 600 ℃, the hardness decreases significantly, and the toughness increases greatly. The impact tested specimen tempered at 700 ℃ is not broken completely. After water quenching, the matrix structure gradually transforms into tempered martensite, tempered troostite and tempered sorbite as the tempering temperature increases. The fracture mode of tempered specimens in the temperature range of 300 ℃ to 600 ℃ is quasi-cleavage fracture, and the fracture mode of high temperature tempered specimen is ductile fracture. The microstructure and carbides obtained by tempering at different temperatures have a great influence on the impact toughness.

Key words: 3Cr3Mo2NiW steel, tempering temperature, mechanical properties, fracture morphology, fracture mode

CLC Number:

Li Pu, Wei Shizhong, Zhang Cheng, Wang Xiaodong, Luo Cheng. Effect of tempering temperature on mechanical properties and fracture morphology of 3Cr3Mo2NiW steel[J]. Heat Treatment of Metals, 2020, 45(6): 22-27.

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