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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。
Gas cylinder with 6061A aluminum alloy cold spinning aluminum tube at both ends of the mouth, the overall location of the mouth fracture. In this paper, the fracture morphology and microstructure of the aluminum tube were observed. The chemical composition of the aluminum tube was examined. Thermal simulation test was carried out to determine the fracture properties of the aluminum tube. The causes of the fracture were comprehensively analyzed. The results show that the aluminum tube is the intergranular fracture mode, which is mainly related to the excessive burning of the alloy caused by the overheating of the aluminum tube. It is suggested to strictly control the heating temperature at both ends of the aluminum pipe and to change the heating mode when the aluminum pipe is closed under the conditions permitting to prevent the brittle failure of the aluminum pipe.