摘要
利用激光冲击强化对12Cr2Ni4A不锈钢焊接接头进行处理,比较了激光冲击一次和二次前后焊接接头拉伸性能、显微硬度和表面残余应力.结果表明,12Cr2Ni4A焊接试件经过二次激光冲击强化后,显微硬度提高了50%,抗拉强度由818.5 MPa提升至863.8 MPa,并且断裂区域由焊接热影响区转移至基体处,焊接试件的拉伸性能显著提高.激光冲击强化消除的焊接残余拉应力是焊接接头拉伸性能提高的主要原因.
The welded specimen of 12Cr2Ni4A stainless steel was shocked by pulse laser shock processing(LSP) as a post weld treatment technology once and twice,and the Erichsen test,surface residual stress and hardness of the welding joints of 12Cr2Ni4A stainless steel were compared before and after LSP treated.The results indicate that the microhardness of the joints is improved by 50% after twice laser shock treated,the tension strength is enhanced from 818.5 MPa to 863.8 MPa,and the position of fracture transfers from hear-affected zone to parent material.The LSP treatment can improve the tensile strength of the joints effectively,and the eliminating of residual compressive stress makes great contributions to the improvement in fatigue properties of welding joints.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2011年第4期52-54,58,共4页
Transactions of The China Welding Institution
关键词
激光冲击强化
表面处理
焊接接头
拉伸性能
laser shock processing
surface treatment
welding joints
tensile strength
