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| Failure Behavior of Differential Bolt |
| Received:August 13, 2018 Revised:November 25, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.11.020 |
| KeyWord:differential bolt failure decarburization fatigue fracture |
| Author | Institution |
| WU Xu-hui |
1. Representative Bureau of Naval Equipment Department in Chongqing, Chongqing , China |
| FU Yang-fan |
2. Southwest Technology and Engineering Research Institute, Chongqing , China |
| WANG Chang-peng |
2. Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| Objective To research the causes for failure of car differential bolt. Methods The failure behavior of car differential bolt was researched based on analysis and test on chemical composition, nonmetallic inclusion, mechanical property, metallographic structure, fracture morphology, etc. to conclude the cause of failure. Results There was no abnormity to the experimental data such as chemical composition, hydrogen content, core hardness, metallographic structure, strength of extension and yield strength. The fracture had apparent fatigue crack. The thread surface had decarburization with a layer depth of 0.07mm. Both sides of the thread were free from decarburization. Both thread surface and crack interior had no corrosion product. Conclusion The surface hardness and fatigue strength of the bolt decline due to the surface decarburization; while stress concentration in the thread root leads to crack of the root and extends the crack further under the action of alternating load and finally leads to fatigue fracture. |
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