| 不锈钢螺栓断裂原因分析 |
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| 引用本文： | 董唯莉,付金鹏,张浩,张俊生,康凯.不锈钢螺栓断裂原因分析[J].失效分析与预防,2014,9(1):43-47. |
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| 作者姓名： | 董唯莉 付金鹏 张浩 张俊生 康凯 |
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| 作者单位： | 中航工业沈阳飞机工业（集团）有限公司,沈阳 110850 |
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| 摘 要： | 飞机在飞行一段时间后，输油管卡箍上的螺栓发生断裂。通过宏观检查、基体材料化学成分分析、断口宏观微观分析、能谱分析、硬度测试和金相检验等方法对断裂螺栓进行了分析。结果表明:螺栓的断裂性质为应力腐蚀；环境介质和工作应力的共同作用，使螺栓在应力集中的T型连接处产生应力腐蚀断裂；未按要求状态进行最终热处理导致螺栓组织异常、硬度偏高，从而增加了螺栓的应力腐蚀敏感性，对断裂的发生起到了促进作用。
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| 关 键 词： | 螺栓 不锈钢 热处理 应力腐蚀 |
| 收稿时间： | 2013-10-09 |
Fracture Analysis of Stainless Steel Bolt |
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| DONG Wei-li,FU Jin-peng,ZHANG Hao,ZHANG Jun-sheng,KANG Kai.Fracture Analysis of Stainless Steel Bolt[J].Failure Analysis and Prevention,2014,9(1):43-47. |
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| Authors: | DONG Wei-li FU Jin-peng ZHANG Hao ZHANG Jun-sheng KANG Kai |
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| Affiliation: | ( AVIC Shengyang Aircraft Industy (Group) Ltd., Shenyang 110850, China) |
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| Abstract: | A stainless steel bolt of the clamp of an aircraft oil pipeline fractured after serving for a while. The failure mode and cause of the bolt were analyzed by macro and micro observation, chemical composition analysis, energy spectrum analysis. hardness testing and metallographic examination. The results show that the fracture mode of the bolt is stress corrosion. The co- effect of environmental media and work stress led to the stress corrosion fracture of the bolt at the T root, where stress concentration existed. Improper heat treatment led to abnormal microstructure and high hardness, which increased the susceptibility to stress corrosion and promoted the fracture of the bolt. |
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| Keywords: | bolt stainless steel heat treatment stress corrosion |
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