喷丸强化对2XXX铝合金疲劳寿命的影响  

Influence of Shot Peening on Fatigue Life of 2XXX Aluminum Alloy

作　　者：周松[1,2] 谢里阳[1] 回丽[2] 张啸尘[1] 许良[2] 

机构地区：[1]东北大学机械工程与自动化学院,沈阳110004 [2]沈阳航空航天大学航空制造工艺数字化国防重点学科实验室,沈阳110136

出　　处：《材料工程》2014年第12期86-91,共6页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51175072);高等学校博士学科点专项科研基金资助(20110042130003)

摘　　要：研究喷丸对2XXX铝合金拉-拉疲劳性能的影响。对未喷丸试样和喷丸强化试样的微观组织、显微硬度、残余应力和拉-拉疲劳性能进行对比分析。结果表明:喷丸处理后,试样的组织和微结构未发现明显变化,但其粗糙度、残余压应力和显微硬度有所提高,分别是未喷丸试样的6.25倍,3.85倍和1.12倍;拉-拉疲劳性能显著提高,其中值疲劳寿命是未喷丸的1.67倍。在99.9%存活率下,喷丸试样的安全寿命是未喷丸试样的1.45倍。且表面喷丸强化后疲劳裂纹源由多个变为一个。The influence of shot peening on the tension-tension fatigue properties of 2XXX aluminum alloy was studied. The microstructure, microhardness, residual stress and tension-tension fatigue per- formance of the specimens were analyzed, before and after shot peening. The results show that the structure and microstructure of the specimens have no obvious change, but the roughness, residual compressive stress and microhardness increase obviously, which are 6.25, 3.85, 1. 12 times respec- tively of samples without shot peening. The tension-tension fatigue properties improve greatly,aver- age life of the shot peening specimens is 1.67 times of that specimens without shot peening. Under 99.9% survival rate, the safety life of specimens after shot peening is 1.45 times Of that specimens without shot peening. After shot peening, the fatigue crack source on the surface changes to one source from multi sources.

关 键 词：铝合金 疲劳 喷丸 微观组织 残余应力 

分 类 号：TG178[金属学及工艺—金属表面处理] V261[金属学及工艺—金属学]