激光冲击处理对GH3039高温拉伸性能的影响  

Effect of Laser Shock Peening on High-Temperature Tensile Property of GH3039 Superalloy

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

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

出　　处：《激光与光电子学进展》2022年第7期261-268,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)。

摘　　要：为了研究激光冲击处理GH3039高温合金的高温拉伸性能,采用高能激光束对GH3039高温合金试样进行冲击处理,对比分析了温度为600℃时不同保温时间下激光冲击处理GH3039的表面残余应力的松弛行为,研究了保温5 h后激光冲击处理GH3039的晶粒尺寸变化特性以及激光冲击前后GH3039的高温拉伸性能和断口。结果表明:经激光冲击处理后,GH3039表层晶粒显著细化,冲击区域表层1.7 mm深度范围内的应力为残余压应力。600℃下保温5 h后,激光冲击处理GH3039的晶粒平均尺寸由20.5μm增大到28.8μm,但远小于母材晶粒平均尺寸47.9μm;随着保温时间的延长,激光冲击处理GH3039的表面残余应力的松弛速率呈持续下降趋势;相比于母材,600℃下激光冲击试样的平均极限抗拉强度提升了7.9%,这归因于激光冲击处理诱导的晶粒细化和残余压应力。In order to study the high-temperature tensile properties of GH3039 superalloy treated by laser shock peening(LSP),the GH3039 superalloy samples are first peened by a high-energy laser beam.Then,the relaxation behavior of residual stress on the surface of LSP GH3039 after exposure at 600 ℃ for different time,the change in grain size of LSP GH3039 after exposure at 600 ℃ for 5 h,and the high-temperature tensile properties and fractures of GH3039 before and after LSP are compared and analyzed.The results show that after LSP impact,the grains in the near surface of GH3039 are significantly refined,and the residual compressive stress is found in the surface layer of the impact area at a depth of around1.7 mm.After exposure at 600 ℃ for 5 h,the average grain size of LSP GH3039 increases from 20.5 μm to 28.8 μm,much smaller than the average grain size(47.9 μm) of the base metal.With the increase of exposure time,the relaxation rate of the surface residual stress of LSP GH3039 decreases,which shows a continuous decreasing trend.Compared with that of the base metal,the average ultimate tensile strength of the laser treated sample at 600 ℃ increases by 7.9%,which is attributed to grain refinement and residual compressive stress induced by laser impact treatment.

关 键 词：材料 激光冲击处理 GH3039高温合金 残余应力热松弛 高温拉伸性能 

分 类 号：TN249[电子电信—物理电子学] TG115.5[金属学及工艺—物理冶金]