| 吴旭辉,付扬帆,王长朋.差速器螺栓失效行为研究[J].装备环境工程,2018,15(11):109-112. WU Xu-hui,FU Yang-fan,WANG Chang-peng.Failure Behavior of Differential Bolt[J].Equipment Environmental Engineering,2018,15(11):109-112. |
| 差速器螺栓失效行为研究 |
| Failure Behavior of Differential Bolt |
| 投稿时间：2018-08-13 修订日期：2018-11-25 |
| DOI：10.7643/ issn.1672-9242.2018.11.020 |
| 中文关键词: 差速器螺栓 失效 脱碳 疲劳断裂 |
| 英文关键词:differential bolt failure decarburization fatigue fracture |
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| 中文摘要: |
| 目的 研究车辆差速器螺栓失效原因。方法 在化学成分、非金属夹杂物、力学性能、金相组织、断口形貌等检测分析的基础上，研究车辆差速器螺栓的失效行为，推断失效原因。结果 差速器螺栓化学成分、氢含量、心部硬度及金相组织、材料抗拉强度及屈服强度等均未见明显异常，断口有明显的疲劳断裂特征，螺纹表层存在脱碳现象，脱碳层深度约为0.07 mm。裂纹起始于螺纹根部，裂纹两侧无脱碳现象，螺纹表面及裂纹内部均未见腐蚀产物。结论 由于表面脱碳使得差速器螺栓表面硬度及疲劳强度降低，而螺纹根部存在的应力集中使早期裂纹在螺纹根部产生，并在交变载荷作用下进一步扩展，进而最终导致疲劳断裂。 |
| 英文摘要: |
| 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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