Typical fracture and cause analysis of 35CrMnSiA ultra-high strength steel

doi:10.13251/j.issn.0254-6051.2022.12.047

Abstract

Abstract: In order to investigate the fracture mechanism and fracture causes of the low percentage reduction of area of the 35CrMnSiA ultra-high strength steel tensile specimens, four common types of fractures were observed and analyzed by means of scanning electron microscope and energy dispersive spectrometer. The results show that the fish-eye defect caused by the combined action of a certain amount of hydrogen and tensile stress is the main reason for the low percentage reduction of area of conventional plastic fracture. Brittle-plastic mixed fracture is caused by hydrogen embrittlement around large inclusions, which leads to the decrease of the percentage reduction of area of the steel. The pencil-tip shaped fracture is mainly caused by large particle inclusions or hydrogen damage defects in steel. Brittle fracture is caused by mechanical damage to the material or the formation of micro-cracks caused by hydrogen accumulation on the damaged surface.

Key words: 35CrMnSiA steel, fracture analysis, fracture mechanism, fracture reason, inclusion, hydrogen embrittlement

CLC Number:

TG142.33

Wang Chunyan, Zhang Fa, Jie Ruihua, Wang Chunmei. Typical fracture and cause analysis of 35CrMnSiA ultra-high strength steel[J]. Heat Treatment of Metals, 2022, 47(12): 284-288.

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