Failure Analysis on 42CrMo Steel Bolt Fracture

Fracture behaviors of 42CrMo ultrahigh strength steel-based bolt have been experimentally studied including macroscopic and microscopic fracture observation, metallographic test, mechanical property testing, and energy spectrum analysis. The results show that a large amount of structure defects, suc...

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Bibliographic Details
Published in:Advances in materials science and engineering 2019, Vol.2019 (2019), p.1-8
Main Authors: Li, Congdong, Liu, Jingshun, Qu, Ting, Zhao, Zengqi, He, Zhihui, Zhang, Ru, Yan, Jianwei, Hongfei, Guo, Wan, Ming
Format: Article
Language:English
Subjects:
Chromium molybdenum steels
Crack propagation
Defects
Depletion
Energy spectra
Engineering
Failure analysis
Fatigue failure
Fatigue strength
Fracture mechanics
Fracture strength
Grain size
Growth rate
Heat treating
High strength steels
Impact tests
Inclusions
Materials fatigue
Mechanical properties
Mechanics
Metal fatigue
Morphology
Spectrum analysis
Steel
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Summary:Fracture behaviors of 42CrMo ultrahigh strength steel-based bolt have been experimentally studied including macroscopic and microscopic fracture observation, metallographic test, mechanical property testing, and energy spectrum analysis. The results show that a large amount of structure defects, such as sulfide inclusions, band, and carbon depletion, appear in the fracture origin region and matrix of the bolt. Such defects reduce fatigue strength of materials and easily yields fatigue fracture origin. In addition, sulfide inclusions provide easy access to crack growth, gradually reducing the effective cross section of the bolt accompanying with increasing stress and finally causes fracture when stress exceeds the material fracture strength. The fracture mechanism is also explored based on fracture failure criterion and fatigue crack growth curve.
ISSN:1687-8434
1687-8442
DOI:10.1155/2019/2382759