Fracture failure analysis of 60Si2Mn spring steel

doi:10.13251/j.issn.0254-6051.2021.08.047

Abstract

Abstract: 60Si2Mn spring steel fractured during normal service, and part of the original workpiece was lost after the fracture, the fracture origin position was determined according to the mechanics of materials and combined with the characteristics of the fracture. Microstructure, macro and micro fracture morphology and chemical composition of the remained fractured parts were analyzed by means of optical microscope, scanning electron microscope, stereo microscope, direct reading spectrometer, etc. to determine the origin and characteristics of the fracture. The results show that due to improper operation of the production process, there are micro-cracks on the surface of the spring. At the same time, due to the improper shot peening process, a deep stress line is formed on the surface of the spring, and then develops into cracking and shedding along the stress line. These microcracks, cracks and shedding act as the source of fatigue fracture of the spring, and cause the spring to fracture.

Key words: spring steel, failure analysis, microcrack, stress line, shot peening, fracture

CLC Number:

TH135

Nie Xiaolong, Gao Jiaqiang, Meng Kairen, Wang Junyi, Liu Xinkuan. Fracture failure analysis of 60Si2Mn spring steel[J]. Heat Treatment of Metals, 2021, 46(8): 246-249.

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