喷丸处理对SAF2507铁素体-奥氏体双相不锈钢显微组织和残余应力的影响  

Effect of Shot Peening on Microstructure and Residual Stress of SAF2507 Ferritic-Austenitic Duplex Stainless Steel

作　　者：时旭 陈明 姜传海[2] SHI Xu;CHEN Ming;JIANG Chuanhai(AECC Shenyang Liming Aero-Engine Co.,Ltd.,Shenyang 110043,China;School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]中国航发沈阳黎明航空发动机有限责任公司,沈阳110043 [2]上海交通大学材料科学与工程学院,上海200240

出　　处：《机械工程材料》2019年第7期59-63,共5页Materials For Mechanical Engineering

摘　　要：对SAF2507铁素体-奥氏体双相不锈钢进行表面喷丸处理,采用X射线应力分析和衍射线形分析方法研究了喷丸对试验钢表面粗糙度、显微组织、残余应力的影响。结果表明:喷丸后铁素体相内位错较少,奥氏体相内出现大量位错缺陷,试验钢表面粗糙度增大,表层晶粒细化,显微畸变和位错密度增大;喷丸在试验钢的近表层引入了较高的残余压应力,奥氏体相和铁素体相中的最大压应力均出现在次表层,其值分别为915MPa和763MPa。SAF2507ferrite-austenite duplex stainless steel surface was treated by shot peening.Effects of shot peening on surface roughness,microstructure and residual stress of the tested steel were studied by X-ray stress analysis and diffraction line-profile analysis.The results show that after shot peening,there were fewer dislocations in ferrite phase,a large number of dislocations in austenite phase,and the surface roughness of tested steel increased.The surface grain of the tested steel was refined,the micro-distortion and dislocation density increased.High residual compressive stress was introduced in the near surface layer of the tested steel by shot peening. The maximum compressive stress in austenite phase and ferrite phase appeared in the subsurface layer,with values of 915 MPa and 763MPa,respectively.

关 键 词：喷丸 双相不锈钢 X射线应力分析 线形分析 

分 类 号：TG178[金属学及工艺—金属表面处理]