7075铝合金循环载荷下残余应力松弛的实验研究  

Experimental Study of Residual Stress Relaxation of 7075 Aluminum Alloy under Cyclic Loading

作　　者：胡永会[1] 吴运新[1] 郭俊康[1] 

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《中国材料进展》2010年第6期50-54,共5页Materials China

基　　金：国家重点基础研究发展规划项目973项目(2005CB623708)

摘　　要：采用淬火和喷砂2种强化工艺引入残余应力,分析循环应力作用下7075铝合金应力松弛现象。基于应力松弛机理讨论了2种不同强化工艺下残余应力松弛规律的异同。结果表明,加载应力状态与大小、残余应力的初始分布和冷作硬化是影响残余应力松弛的主要因素。Residual stresses of 7075 aluminum alloy were introduced by quenching and shot peening strengthening processes in order to clarify the residual stress relaxation mechanism and laws. And differences of residual stress relaxations under different strengthening technologies were discussed. The resuhs show that state and magnitude of the applied stress, initial distribution of the residual stress and cold working have great influences on stress relaxation. Structural residual stress introduced by quenching relaxes a little under cyclic loading while the stress induced by shot peening relaxes a lot on the same cyclic stress scale.

关 键 词：7075铝合金 残余应力 应力松弛 淬火强化 喷砂强化 

分 类 号：TG115.5[金属学及工艺—物理冶金] TG146[金属学及工艺—金属学]