Effect of quenching without holding on microstructure and mechanical properties of 40Cr steel

doi:10.13251/j.issn.0254-6051.2020.08.020

Abstract

Abstract: Microstructure and properties of the 40Cr steel quenched at different temperatures without holding were studied. The results show that when quenched in the range of 850-910 ℃ without holding and tempered at 550 ℃, the hardness, tensile strength and impact absorbed energy of the 40Cr steel increase first and then decrease with the increase of quenching temperature. The highest hardness, tensile strength and impact absorbed energy can be obtained when quenched at 890 ℃ without holding and tempered at 550 ℃, and these properties are better than that by traditional quenching with holding. The property improvement of the 40Cr steel after quenching without holding is related to its fine lath martensite, austenite grain refinement and non-uniform distribution of carbon concentration in austenite.

Key words: 40Cr steel, quenching without holding, microstructure, properties

CLC Number:

TG15

Kang Xueqin, Xu Zhengmao, Lin Enbo, Chen Liang. Effect of quenching without holding on microstructure and mechanical properties of 40Cr steel[J]. Heat Treatment of Metals, 2020, 45(8): 105-107.

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