| 20MnTiB钢螺栓断裂失效分析 |
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| 引用本文： | 王弘,高庆,戴振羽.20MnTiB钢螺栓断裂失效分析[J].理化检验(物理分册),2003,39(8):426-429. |
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| 作者姓名： | 王弘 高庆 戴振羽 |
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| 作者单位： | 西南交通大学应用力学与工程系,成都,610031 |
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| 摘 要： | 应用扫描电子显微镜、光学显微镜、显微硬度仪和电子探针X射线显微分析仪，对发射架20MnTiB高强度螺栓断裂件的金相组织、显微硬度、断口微观形貌和合金元素分布状态进行了分析。结果表明，断裂螺栓金相组织正常，力学性能符合技术要求；螺栓断裂失效是由于在螺栓根部存在因加工不当产生的初始裂纹，在初始裂纹尖端的应力集中和露天使用环境中水介质的共同作用下，螺栓发生应力腐蚀开裂。应力腐蚀开裂的方式是阳极溶解型。
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| 关 键 词： | 螺栓 断裂 失效分析 结构钢 显微硬度仪 光学显微镜 应力腐蚀 断口分析 |
| 文章编号： | 1001-4012(2003)08-0426-04 |
| 修稿时间： | 2002年10月21 |
FRACTURE ANALYSIS OF 20MnTiB STEEL BOLT |
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| WANG Hong,GAO Qing,DAI Zhen yu.FRACTURE ANALYSIS OF 20MnTiB STEEL BOLT[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2003,39(8):426-429. |
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| Authors: | WANG Hong GAO Qing DAI Zhen yu |
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| Abstract: | The microstructure, micro hardness, micrograph of fracture surface and the element distribution of alloy of a failed high strength bolt which was made of 20MnTiB steel was analyzed by scanning electron microscopy (SEM), optical microscopy, micro hardness and Electron Probe Microanalysis (EPMA). The results showed that microstructure of failed bolt is normal, and mechanical property meet the technology criterion. Failure of bolt is due to original crack brought on manufacture, both stress concentration of original crack tip and corrosion condition of the open air caused the stress corrosion cracking of bolt. Corrosion is anodic oxidation. |
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| Keywords: | MnTiB Bolt Fracture Stress corrosion Failure analysis |
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