Fatigue fracture failure analysis and heat treatment process improvement of high carbon steel spring component

doi:10.13251/j.issn.0254-6051.2024.06.046

Abstract

Abstract: High carbon steel spring component of wireless headphone charger cracked in the fatigue test, for which the fracture mode and cause were determined through observation of the fracture and microstructure, hardness test, and combining with the heat treatment process and fatigue test conditions. The results show that the fracture mode is low stress fatigue fracture, the cause of which is that a lot of undissolved carbides exist in the microstructure after austempering and tempering, leading to stress concentration in the circular arc transition zone of the elastic arm of the spring component in the durability test, then leading to crack initiation, propagation, and finally resulting in fracture. By improving heat treatment process according to the actual production conditions, the optimum heat treatment process is found as: quenching at 830 ℃ for 20 min with carbon potential 0.75%+salt bath austempering at 305 ℃ for 35 min+tempering at 305 ℃ for 90 min. After heat treatment with the improved process, the Vickers hardness of the high carbon steel spring component is 584 HV0.2, and the durability test life is over 90 000 times.

Key words: 1074 carbon steel spring component, fatigue fracture, heat treatment, microstructure, hardness

CLC Number:

TG156

Wang Yameng, Xu Zhiwen, Gao Jinfeng, Xu Jinling. Fatigue fracture failure analysis and heat treatment process improvement of high carbon steel spring component[J]. Heat Treatment of Metals, 2024, 49(6): 295-300.

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