摘要
High strength aluminum alloys of 7xxx series have unacceptable levels of quenching residual stresses from solution heat treatment. The residual stress not only results in machining distortion and dimensional instability, but also increases the possibility of stress corrosion cracks. Therefore, it is necessary to reduce the residual stress to an acceptable level. The crack compliance method was adopted to study the influences of various stress relief methods on residual stress patterns in 7050 aluminum alloy. The results show that 90% residual stress can be eliminated by the cold stretching(Tx51) method. And a lower level of residual stress can be achieved by the uphill quenching(Tx53) method or the cold compression(Tx52). However, there is a very steep residual stress gradient normal to exterior surfaces.
High strength aluminum alloys of 7xxx series have unacceptable levels ofquenching residual stresses from solution heat treatment. The residual stress not only results inmachining distortion and dimensional instability, but also increases the possibility of stresscorrosion cracks. Therefore, it is necessary to reduce the residual stress to an acceptable level.The crack compliance method was adopted to study the influences of various stress relief methods onresidual stress patterns in 7050 aluminum alloy. The results show that 90% residual stress can bee-liminated by the cold stretching (Tx51) method. And a lower level of residual stress can beachieved by the uphill quenching(Tx53) method or the cold compression(Tx52). However, there is avery steep residual stress gradient normal to exterior surfaces.
出处
《中国有色金属学会会刊：英文版》
CSCD
2003年第5期1190-1193,共4页
Transactions of Nonferrous Metals Society of China
基金
Project(5 0 17510 2 )supportedbytheNationalNaturalScienceFoundationofChina
关键词
铝合金
残余应力
应力松弛
评价
破碎可塑性
aluminum alloy
residual stress
stress relief
evaluation
crack compliancemethod
