激光冲击处理对GH3039高温合金表面完整性的影响  

Effect of Laser Shock Peening on Surface Integrity of GH3039 Superalloys

作　　者：周文 葛茂忠 王太明 项建云 Zhou Wen;Ge Maozhong;Wang Taiming;Xiang Jianyun(School of Mechanical Engineering,Jiangsu University of Technology,Changzhou,Jiangsu 213001,China;China Airlines Changzhou Lanxiang Machinery Co.,Ltd.,Changzhou,Jiangsu 213022,China;School of Modern Equipment Manufacturing,Changzhou Institute of Industry Technology,Changzhou,Jiangsu 213164,China)

机构地区：[1]江苏理工学院机械工程学院,江苏常州213001 [2]中国航发常州兰翔机械有限责任公司,江苏常州213022 [3]常州工业职业技术学院现代装备制造学院,江苏常州213164

出　　处：《激光与光电子学进展》2021年第3期195-202,共8页Laser & Optoelectronics Progress

基　　金：江苏省科技成果转化项目(BA2018070);江苏省自然科学基金面上项目(BK20151171);江苏省研究生实践创新计划项目(20820111943)。

摘　　要：为了研究激光冲击处理对GH3039高温合金表面完整性的影响,对GH3039高温合金试样进行了不同次数的激光冲击。采用表面轮廓仪、显微硬度计及X射线衍射仪等表征了激光冲击前后GH3039高温合金的表面粗糙度、显微硬度、残余应力、微观结构及物相组成。结果表明:与母材相比,在激光一次、二次和三次冲击后,试样的表面粗糙度平均值分别增加了28.5%、54.1%和109.1%,表面显微硬度分别增加了21.4%、26.5%和28.6%,试样的近表层平均晶粒尺寸分别减小了54.5%、57.1%和59.3%;激光冲击处理将试样表面的残余应力由拉应力(75 MPa)转变为压应力(一次冲击后为-275 MPa、二次冲击后为-302.4 MPa和三次冲击后为−335 MPa);激光冲击试样的变形层深度由1.2 mm左右(一次冲击)增加到1.5 mm左右(三次冲击);随着冲击次数的增加,衍射峰的半峰全宽明显增大,这归因于晶粒细化和微观应变的增加。In order to study the effect of laser shock peening(LSP)on the surface integrity of GH3039 superalloys,the GH3039 superalloy samples have been treated by LSP for different times.The surface roughness,microhardness,residual stress,microstructure and phase composition of GH3039 superalloys before and after LSP were characterized by the surface profiler,microhardness tester and X-ray diffractometer.The results indicate that compared with those of the base metal,after one,two,and three impacts,the surface roughness of LSP samples is increased by 28.5%,54.1%,and 109.1%,the surface microhardness is increased by 21.4%,26.5%,and 28.6%,and the average grain size in the near surface layer is decreased by 54.5%,57.1%,and 59.3%,respectively.The residual stress of the sample surface is transformed from tensile stress(75 MPa)into compressive stress(−275 MPa for one impact,−302.4 MPa for two impacts,and−335 MPa for three impacts).The deformation layer depth of the LSP sample increases from around 1.2 mm(for one impact)to around 1.5 mm(for three impacts).With the increase in the number of impacts,the full widths at half maximum of diffraction peaks increase obviously,which is attributed to grain refinement and micro-strain enhancement.

关 键 词：激光技术 GH3039 激光冲击处理 表面完整性 

分 类 号：TN249[电子电信—物理电子学]