EFFECTS OF ULTRASONIC NANOCRYSTAL SURFACE MODIFICATION ON RESIDUAL STRESS, MICROSTRUCTURE AND LOCAL PROPERTIES OF WELDED 304 STAINLESS STEEL

摘要

In this study Ultrasonic Nano-crystal Surface Modification (UMSM) of welded stainless steel 304 samples was carried out. On the outer surface, UNSM effectively eliminates the tensile stress generated by the welding process and imparts beneficial compressive residual stress. In addition, UNSM can effectively refine the grains at the material surface, which is also beneficial to material corrosion performance. Material hardness significantly increased after UNSM. UNSM can significantly improve component corrosion resistance.