| 30CrMnSiA钢沉头螺栓断裂失效分析 |
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| 引用本文： | 于海华,严海燕,张敬彤,王宇魁,黄智勇,邬建新,魏振伟.30CrMnSiA钢沉头螺栓断裂失效分析[J].金属热处理,2021,46(3):223-228. |
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| 作者姓名： | 于海华 严海燕 张敬彤 王宇魁 黄智勇 邬建新 魏振伟 |
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| 作者单位： | 1.航空工业陕西飞机工业集团有限公司, 陕西 汉中 723200; 2.中国航发北京航空材料研究院, 北京 100095 |
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| 摘 要： | 某飞机用30CrMnSiA钢沉头螺栓在拆卸过程中发生断裂,同炉批未曾使用的螺栓经磁粉检测也存在裂纹。为查找失效分析原因,通过对断裂件和同炉批开裂的螺栓外观检查、断口宏微观分析、能谱分析、硬度检测、金相分析等方法对断裂和开裂的螺栓进行了分析。结果表明:断裂螺栓和开裂螺栓断裂类型为氢脆,螺栓氢脆断裂主要与抗拉强度和热处理工艺有关,通过改善热处理工艺参数,适当降低螺栓的强度,增加酸洗后的除氢时间降低氢含量,从而避免氢脆发生的可能性。
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| 关 键 词： | 30CrMnSiA钢 沉头螺栓 氢脆 断裂 失效分析 |
| 收稿时间： | 2020-10-27 |
Failure analysis of 30 CrMnSiA steel countersunk bolt |
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| Yu Haihua,Yan Haiyan,Zhang Jingtong,Wang Yukui,Huang Zhiyong,Wu Jianxin,Wei Zhenwei.Failure analysis of 30 CrMnSiA steel countersunk bolt[J].Heat Treatment of Metals,2021,46(3):223-228. |
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| Authors: | Yu Haihua Yan Haiyan Zhang Jingtong Wang Yukui Huang Zhiyong Wu Jianxin Wei Zhenwei |
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| Affiliation: | 1. Avic Shaanxi Aircraft IndustryGroup Corporation Ltd., Hanzhong Shaanxi 723200, China; 2. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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| Abstract: | A 30CrMnSiA steel countersunk bolt used in an aircraft breaks during disassembly,and cracks were also found in the same batch of unused bolts detected by magnetic powder.In order to find out the cause of failure analysis,the broken and cracked bolts were analyzed by means of appearance inspection,macro-microscopic analysis of fracture surface,energy spectrum analysis,hardness test and metallographic analysis.The results show that the fracture type of broken and cracked bolts is hydrogen embrittlement.The hydrogen embrittlement fracture of bolt is mainly related to tensile strength and heat treatment process.By improving the heat treatment process parameters,the strength of bolt is appropriately reduced and the hydrogen content is reduced by increasing the hydrogen removal time after pickling.Thus the possibility of hydrogen embrittlement is avoided. |
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| Keywords: | 30CrMnSiA steel countersunk bolt hydrogen embrittlement fracture failure analysis |
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