激光喷丸对TC17钛合金疲劳强度的影响  

Effect of Laser Peening on Fatigue Strength of TC17 Titanium Alloys

作　　者：黄帅[1] 朱颖[2] 郭伟[2] 彭鹏[2] 刁训刚[1] 

机构地区：[1]北京航空航天大学物理科学与核能工程学院,北京100191 [2]北京航空航天大学机械工程及自动化学院,北京100191

出　　处：《激光与光电子学进展》2017年第11期232-238,共7页Laser & Optoelectronics Progress

基　　金：国家国际科技合作专项(2013DFR50590)

摘　　要：为了研究激光喷丸(LP)对TC17钛合金疲劳强度的影响,采用两次LP工艺对TC17钛合金进行了强化处理,并使用升降法测试比较了LP前后材料的疲劳强度。结果显示,LP可在TC17钛合金表面形成深度为11.7μm的微凹坑,产生的残余压应力为LP前的2.46倍。残余压应力的增大引起了裂纹源位置的变化及疲劳条带的细化,TC17钛合金的疲劳强度提高了3.9%。In order to study the effect of laser peening （LP） on the fatigue strength of TC17 titanium alloys, the alloys are processed by LP for two times, and the fatigue strength of the materials before and after LP are tested and compared with the lifting and lowering method. The results show that the 11.7 btm deep micropits form on the surface of TC17 titanium alloys after LP and the produced residual compressive stress is 2.46 times that before LP. The increase of the residual compressive stress leads to the location change of crack sources and the refinement of fatigue strips, and the fatigue strength of TC17 titanium alloys is increased by 3.9%.

关 键 词：激光技术 激光喷丸 TC17钛合金 疲劳强度 残余压应力 

分 类 号：TN249[电子电信—物理电子学]