6061A冷旋压铝管断裂失效分析  

Fracture analysis of cold spun 6061A aluminum alloy tube

作　　者：程琴[1] 曾蓉[2] 何玉怀[1] 

机构地区：[1]中航工业北京航空材料研究院中国航空工业集团公司失效分析中心航空材料检测与评价北京市重点实验室,北京100095 [2]萍乡学院材料与化学工程系,江西萍乡337055

出　　处：《金属热处理》2015年第11期197-201,共5页Heat Treatment of Metals

摘　　要：气瓶用6061A铝合金冷旋压铝管两端在收口时,在收口位置出现整体断裂。本文对铝管的断口形态以及组织进行了观察,检测了铝管的化成成分,并对其进行热模拟试验,确定了铝管的断裂性质,对其断裂原因进行了综合分析。研究结果表明,铝管为沿晶断裂模式,主要与铝管收口的超温导致合金过烧有关。建议严格控制铝管两端收口加热温度,在条件允许的情况下改变铝管收口时的加热方式,可以预防铝管脆性失效。6061A cold spun aluminum alloy tube fractured integrally on the mouth when closed up during manufacturing.Macro and micro fracture observation,microstructure examination,chemical composition analysis and thermal simulation were carried out to find out the cracking mode and cause of the failure.The results show that the crack mode is intergranular fracture,which is caused by over-heating in the process of closing up the 6061 A cold spun aluminum alloy tube.It is suggested that during closing up the tube mouth,the heating temperature should be strictly controlled in the both ends to avoid the failure.

关 键 词：6061A铝合金 沿晶断裂 过烧 

分 类 号：TG166[金属学及工艺—热处理]