Gao Lingqing, Zhang Xinyao, Zha Xiaoqin, Zhang Xinyu
Luoyang Ship Material Research Institute, Luoyang 471023, China.
Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments, Luoyang 471023, China.
Materials (Basel). 2022 Apr 29;15(9):3230. doi: 10.3390/ma15093230.
Pneumatic chipping hammer and ultrasonic impact peening were used to relieve the welding residual stress of 2205 duplex stainless steel by manual argon arc welding, and the influences of these mechanical shock treatment technologies on the residual stress, microstructure, and corro-sion resistance of the welding seam were studied. Results showed that after pneumatic chipping hammer or ultrasonic impact peening, a small amount of plastic deformation occurred in the welded joint of 2205 duplex stainless steel, which led to an increase in the dislocation density in the microstructure. Meanwhile, the stress state of the welded joint changed from the residual tensile stress to the residual compressive stress. The maximum residual compressive stress could reach -579 MPa. The combined action of the two effectively improved the corrosion resistance of the welded joint. Among them, the best overall effect was the ultrasonic impact peening tech-nology.
采用风铲锤击和超声冲击喷丸方法对2205双相不锈钢手工氩弧焊焊接残余应力进行消除，并研究这些机械冲击处理工艺对焊缝残余应力、微观组织及耐蚀性的影响。结果表明，风铲锤击或超声冲击喷丸后，2205双相不锈钢焊接接头发生少量塑性变形，导致微观组织中位错密度增加。同时，焊接接头应力状态由残余拉应力转变为残余压应力，最大残余压应力可达-579 MPa。二者共同作用有效提高了焊接接头的耐蚀性，其中超声冲击喷丸工艺的综合效果最佳。
