800H焊接接头激光改性性能及数值模拟研究  

Laser Strengthening and Numerical Simulation Study of 800H Superalloy Welded Joint

作　　者：李静[1] 张书响 Li Jing;Zhang Shuxiang(School of Intelligent Manufacturing,Xinziang Vocational and Technical College,Xinziang 453000,Henan,China;School of Mechanical and Electrical Engineering,Henan Institute of Science and Technology,Xinriang 453000,Henan,China)

机构地区：[1]新乡职业技术学院智能制造学院,河南新乡453000 [2]河南科技学院机电学院,河南新乡453000

出　　处：《应用激光》2023年第9期68-74,共7页Applied Laser

基　　金：2019年度河南省高等职业学校青年骨干教师培训计划(2019GZGG112)。

摘　　要：采用激光对800H高温合金焊接接头进行表面冲击强化,研究激光冲击对近表面组织演变及残余应力的影响。结果表明,激光冲击强化可显著细化焊接接头的晶粒尺寸,有效改善焊接接头近表面残余应力分布,由焊态下的拉应力165~216 MPa,转变为-212~-98 MPa。采用Abaqus对焊接激光冲击后进行数值模拟,试验的应力分布趋势与数值分析结果基本相符;在厚度方向上,数值模拟云图呈一定层次分布,与激光冲击产生的冲击波在材料内部传播的特征相符;激光冲击数值分析结果可为激光冲击焊件提供参考依据。Surface modification of 8ooH high temperature alloy welded joint was carried out by laser shock strengthening process.The influence of microstructure evolution and residual stress on welded joint was studied,and numerical simulation of welding and laser shock was carried out by Abaqus.Results show that laser shock strengthening can significantly refine the grain size of welded joints.Impact strengthening can effectively improve the residual stress distribution near welded joint surface,and stress distribution changes from 165~216 MPa to-212~-98 MPa.The stress distribution trend after impact strengthening is basically consistent with the numerical analysis results.The numerical analysis results can provide reference for laser impact weldment.

关 键 词：激光技术 800H高温合金 微观组织 残余应力 

分 类 号：TG456.7[金属学及工艺—焊接]