Effect of heat treatment on mechanical properties and fatigue properties of 51CrMnV spring steel

doi:10.13251/j.issn.0254-6051.2025.01.012

Abstract

Abstract: Microstructure, mechanical properties, and fatigue property of 51CrMnV spring steel under the processes of 900 ℃×30 min quenching+450 ℃×90 min tempering and 900 ℃×30 min+350 ℃×30 min isothermal quenching were investigated by using optical microscopy (OM), scanning electron microscopy (SEM), universal tensile tester, impact tester, and fatigue tester. The results show that after quenching and tempering, the microstructure of the 51CrMnV steel consists of tempered martensite, and after isothermal quenching, the microstructure consists of bainite, martensite and retained austenite. Compared with quenching and tempering, the mechanical properties and fatigue properties of the 51CrMnV steel treated with isothermal quenching are better, with an increase in tensile strength of 53.6 MPa, elongation of 3.1%, impact absorbed energy of 7.3 J, and fatigue limit of 25 MPa.

Key words: isothermal quenching, quenching and tempering, 51CrMnV spring steel, microstructure, mechanical properties, fatigue property

CLC Number:

TG142.1

Huang Weiming, Zhou Haian, Zhao Qiuhong, Xu Wenbing, Yu Xinhong, Feng Yisheng, Zhang Yunshan, Zhao Ertuan. Effect of heat treatment on mechanical properties and fatigue properties of 51CrMnV spring steel[J]. Heat Treatment of Metals, 2025, 50(1): 75-80.

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