飞机盖板螺栓断裂失效分析

doi:10.13251/j.issn.0254-6051.2023.10.046

金属热处理 ›› 2023, Vol. 48 ›› Issue (10): 297-301.DOI: 10.13251/j.issn.0254-6051.2023.10.046

飞机盖板螺栓断裂失效分析

殷小健^1,2, 许永春^1,2, 张兵³, 冯德荣^1,2, 孙晓军^1,2, 张钦莹^1,2

1.河南省紧固连接技术重点实验室, 河南信阳 464000;
2.河南航天精工制造有限公司, 河南信阳 464000;
3.中国航发北京航空材料研究院, 北京 100095

收稿日期:2023-04-21 修回日期:2023-07-28 出版日期:2023-10-25 发布日期:2023-12-07
作者简介:殷小健(1971—),男,研究员,主要研究方向为航天航空紧固件研发,E-mail:15937629598@139.com

Fracture failure analysis of cover plate bolt of aircraft

Yin Xiaojian^1,2, Xu Yongchun^1,2, Zhang Bing³, Feng Derong^1,2, Sun Xiaojun^1,2, Zhang Qinying^1,2

1. Henan Key Laboratory of Fastening Connection Technology, Xinyang Henan 464000, China;
2. Henan Aerospace Precision Machining Co., Ltd., Xinyang Henan 464000, China;
3. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

Received:2023-04-21 Revised:2023-07-28 Online:2023-10-25 Published:2023-12-07

摘要/Abstract

摘要： 某飞机服役一段时间后,机翼盖板1根螺栓发生断裂。通过外观痕迹和断口形貌观察、显微组织检查、硬度测试、能谱成分分析、氢含量测试以及氢脆试验,对螺栓的断裂性质和原因进行了分析。结果表明,螺栓断裂性质为氢致延迟脆性断裂。材料强度偏高,氢脆敏感性较大是螺栓发生氢脆断裂的内因,表面局部腐蚀吸氢是导致螺栓氢脆断裂的直接原因。调整热处理工艺,在满足设计要求的前提下适当降低螺栓的强度,同时加强螺栓的腐蚀防护,可以有效预防氢脆断裂的发生。

关键词: 螺栓, ML30CrMnSiA钢, 氢脆, 断裂, 腐蚀

Abstract: A bolt for the wing cover plate of an aircraft fractured after service for some time. In order to find out the fracture mode and cause of the bolt, observation on appearance and fracture surface, metallographic structure examination, hardness testing, energy dispersive X-ray spectroscopy (EDS) analysis, hydrogen content testing and hydrogen embrittlement test were carried out. The results show that the fracture mode of the bolt belongs to delayed brittle cracking induced by hydrogen embrittlement. High material strength of the bolt leads to high sensitivity to hydrogen embrittlement, which is the internal cause for the hydrogen embrittlement fracture. Local surface corrosion leads to hydrogen absorption, which is the direct cause for the hydrogen embrittlement fracture. Such failure can be effectively prevented by adjusting the heat treatment process of the bolts so as to properly reduce their strength under the premise of meeting the design requirements as well as strengthening the corrosion protection for the bolts.

Key words: bolt, ML30CrMnSiA steel, hydrogen embrittlement, fracture, corrosion

中图分类号:

TG115

殷小健, 许永春, 张兵, 冯德荣, 孙晓军, 张钦莹. 飞机盖板螺栓断裂失效分析[J]. 金属热处理, 2023, 48(10): 297-301.

Yin Xiaojian, Xu Yongchun, Zhang Bing, Feng Derong, Sun Xiaojun, Zhang Qinying. Fracture failure analysis of cover plate bolt of aircraft[J]. Heat Treatment of Metals, 2023, 48(10): 297-301.

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飞机盖板螺栓断裂失效分析

Fracture failure analysis of cover plate bolt of aircraft

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