| 17-4PH不锈钢拉杆失效分析 |
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| 引用本文： | 董翠,刘丽玉.17-4PH不锈钢拉杆失效分析[J].失效分析与预防,2010,5(3):182-186. |
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| 作者姓名： | 董翠 刘丽玉 |
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| 作者单位： | 北京航空材料研究院,北京,100095 |
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| 摘 要： | 某安装工程中作为承力构件的17-4PH不锈钢拉杆在使用过程中发生断裂,对失效拉杆进行化学成分分析、断口形貌和金相组织观察以及力学性能测试,并与完好拉杆进行了对比分析。结果表明：不锈钢拉杆是在腐蚀及应力的共同作用下发生了应力腐蚀断裂;由于热处理不当,导致失效拉杆中块状δ-铁素体的大量存在,时效过程中晶界上碳化物的析出造成材料抗腐蚀能力下降,以及材质＂硬脆＂共同导致拉杆发生断裂。
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| 关 键 词： | 不锈钢 拉杆 断口 失效分析 |
Failure Analysis of 17-4PH Stainless Steel Rod |
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| DONG Cui,LIU Li-yu.Failure Analysis of 17-4PH Stainless Steel Rod[J].Failure Analysis and Prevention,2010,5(3):182-186. |
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| Authors: | DONG Cui LIU Li-yu |
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| Affiliation: | (Beijing Institute of Aeronautical Materials,Beijing 100095,China) |
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| Abstract: | A 17-4PH stainless steel rod fractured during service.Chemical composition analysis,fracture surface and microstructure examination and mechanical property testing were carried out on the failed rod,and the results were compared with those of an undamaged one.The results show that the stainless steel rod was stress corrosion fracture under the co-effect of the corrosion and stress.The corrosion resistance was declined because of the carbide precipitating in the grain boundary during aging and the massively existed δ-ferrite block caused by the improper heat treatment,which together with the ＂hard and brittle＂ material resulted in the failure of the rod. |
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| Keywords: | stainless steel rod fracture failure analysis |
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