喷丸强化对2XXX铝合金疲劳寿命的影响

材料工程, 2014, (12): 86-91. doi: 10.11868/j.issn.1001-4381.2014.12.015

喷丸强化对2XXX铝合金疲劳寿命的影响

周松 ^1, , 谢里阳 ^2, , 回丽 ^3, , 张啸尘 ^4, , 许良 ^5,

1.东北大学机械工程与自动化学院,沈阳110004;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

2.东北大学机械工程与自动化学院,沈阳,110004

3.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

4.东北大学机械工程与自动化学院,沈阳,110004

5.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

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

关键词：铝合金 , 疲劳 , 喷丸 , 微观组织 , 残余应力

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

Keywords： aluminum alloy , fatigue , shot peening , microstructure , residual stress

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.

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