Causes of abnormal double shear fracture of TC4 titanium alloy high-lock bolt
摘 要
某TC4钛合金高锁螺栓在双剪试验过程中发生异常断裂。采用宏观观察、显微组织观察、断口分析和双剪试验,分析了该高锁螺栓发生异常双剪断裂的原因。结果表明:在该高锁螺栓的热处理过程中,其在真空炉中未被及时取出,使螺栓在炉中长时间保温,形成较厚的表面污染层和显微裂纹;通过分析高锁螺栓的加工工艺可知,在热处理后的精车工序中,加工余量较小,导致螺栓表面污染层未被完全去除,在双剪试验过程中受弯矩作用,显微裂纹沿着脆而硬的表面污染层快速扩展,直至螺栓断裂。
Abstract
A TC4 titanium alloy high-lock bolt was abnormally fractured during the double shear test.Through macroscopic observation,microstructure observation,fracture analysis and double shear test,the reasons for the abnormal double shear fracture of high-lock bolt were analyzed.The results showed that during the heat treatment process of high-lock bolt,they were not taken out in time in the vacuum furnace,so that the bolt were kept warm in the furnace for a long time,resulting in a thicker surface contamination layer and micro cracks.It could be seen from the processing technology of high-lock bolt that in the finishing process after heat treatment,the small machining allowance led to incomplete removal of the bolt surface contamination layer.During double shear test,the micro cracks spreaded rapidly along the brittle and hard,surface contamination layer under the action of bending moment until the bolt fractured.
中图分类号 TG115 DOI 10.11973/lhjy-wl202203018
所属栏目 质量控制与失效分析
基金项目
收稿日期 2021/4/22
修改稿日期
网络出版日期
作者单位点击查看
备注许永春(1982-),男,高级工程师,主要从事航空航天紧固件检测技术研究和失效分析工作,xuyc1120@163.com
引用该论文: XU Yongchun,ZHOU Jie,SHEN Peng,SUN Xiaojun,ZHANG Qinying,ZHU Pengfei. Causes of abnormal double shear fracture of TC4 titanium alloy high-lock bolt[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2022, 58(3): 66~69
许永春,周杰,沈鹏,孙晓军,张钦莹,朱鹏飞. TC4钛合金高锁螺栓发生异常双剪断裂原因[J]. 理化检验-物理分册, 2022, 58(3): 66~69
共有人对该论文发表了看法,其中:
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】董瑞峰,李金山,唐斌,等.航空紧固件用钛合金材料发展现状[J].航空制造技术,2018,61(4):86-91.
【2】李蒙,凤伟中,关蕾,等.航空航天紧固件用钛合金材料综述[J].有色金属材料与工程,2018,39(4):49-53.
【3】胡隆伟,叶文君.紧固件材料手册[M].北京:中国宇航出版社,2014.
【4】朱李云,程全士,胡庆宽,等.Ti-6Al-4V航空紧固件热成形温度对显微组织的影响研究[J].金属加工(热加工),2016(23):15-17.
【5】张庆云,陆业航,李众城,等.TC4钛合金紧固件的α污染层[J].中国有色金属学报,2010,20(S1):1013-1015.
【6】高守林,黄重国,雷鹍,等.热处理对TC4钛合金富氧α层的影响[J].热加工工艺,2018,47(20):243-246.
【7】陈容,刘兆华,张达富,等.α污染层对Ti-6Al-4V铸造钛合金组织与性能的影响[J].钢铁钒钛,2017,38(4):48-52.
【2】李蒙,凤伟中,关蕾,等.航空航天紧固件用钛合金材料综述[J].有色金属材料与工程,2018,39(4):49-53.
【3】胡隆伟,叶文君.紧固件材料手册[M].北京:中国宇航出版社,2014.
【4】朱李云,程全士,胡庆宽,等.Ti-6Al-4V航空紧固件热成形温度对显微组织的影响研究[J].金属加工(热加工),2016(23):15-17.
【5】张庆云,陆业航,李众城,等.TC4钛合金紧固件的α污染层[J].中国有色金属学报,2010,20(S1):1013-1015.
【6】高守林,黄重国,雷鹍,等.热处理对TC4钛合金富氧α层的影响[J].热加工工艺,2018,47(20):243-246.
【7】陈容,刘兆华,张达富,等.α污染层对Ti-6Al-4V铸造钛合金组织与性能的影响[J].钢铁钒钛,2017,38(4):48-52.
相关信息