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采用激光冲击强化的方法改善了316L不锈钢焊接接头的耐腐蚀性能,分析了焊接接头表层的微观结构和残余应力分布。结果表明,激光冲击强化使焊接接头表层残余拉应力显著减小,提高了焊接接头的电极电位,阻碍了腐蚀介质向材料的扩散;同时,激光冲击强化细化了基体晶粒,形成了大量的滑移带和变形孪晶组织,延缓了应力腐蚀裂纹的扩展,增强了316L不锈钢焊接接头的耐腐蚀性能。
The corrosion resistance of 316L stainless steel welded joints was improved by laser shock strengthening, and the microstructure and residual stress distribution of the welded joints were analyzed. The results show that the laser shock strengthens the residual tensile stress of the weld joint significantly, increases the electrode potential of the welded joint and hinders the diffusion of the corrosive medium to the material. At the same time, the laser shock strengthens the matrix grains and forms a large amount of Slip band and deformation twinned structure, delayed the expansion of stress corrosion cracking and enhanced the corrosion resistance of 316L stainless steel welded joints.