FRACTURE FAILURE ANALYSIS OF A AUTO HIGH STRENGTH ASSEMBLING BOLT

LAN XiuQiong; CHEN JianHua

doi:10.16579/j.issn.1001.9669.2018.05.042

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FRACTURE FAILURE ANALYSIS OF A AUTO HIGH STRENGTH ASSEMBLING BOLT

更新时间：2022-09-22

- FRACTURE FAILURE ANALYSIS OF A AUTO HIGH STRENGTH ASSEMBLING BOLT
- Journal of Mechanical Strength Vol. 40, Issue 5, Pages: 1263-1265(2018)
- 作者机构：
  
  1. 重庆工业职业技术学院机械工程学院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2018.05.042
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LAN XiuQiong, CHEN JianHua. FRACTURE FAILURE ANALYSIS OF A AUTO HIGH STRENGTH ASSEMBLING BOLT. [J]. 40(5):1263-1265(2018)
DOI：

LAN XiuQiong, CHEN JianHua. FRACTURE FAILURE ANALYSIS OF A AUTO HIGH STRENGTH ASSEMBLING BOLT. [J]. 40(5):1263-1265(2018) DOI： 10.16579/j.issn.1001.9669.2018.05.042.

摘要

针对装配时发生断裂的某型汽车用35钢材质高强度组合螺栓,采用光学显微镜(OM)和扫描电子显微镜(SEM),观察断口微观组织和断口形貌,并利用洛氏硬度计测量螺栓基体硬度,对断裂失效原因进行了综合分析,结果表明:组合螺栓热处理回火工艺满足标准要求,但淬火过程产生的淬火裂纹导致强度降低,装配外力作用使淬火裂纹扩展,从而导致该组合螺栓失稳断裂。

Abstract

Cross section microstructure and fractography of a Auto high strength assembling bolt of 35 steel were observed by optical microscope（ OM） and electron scanning microscope（ SEM）. The hardness of the bolt was measured by HR-150A rockwell hardness tester. The fracture failure of the assembling bolt was analyzed. The results indicate that quenching and tempering treatment on the assembling bolt meet the national standard,but the strength was decreased by the quenching crack generated during quenching. The extension of quenching crack that due to the external force result in the fracture failure.

关键词

组合螺栓断裂断口分析

Keywords

Assembling boltFractureFracture analysis

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