对AISI304不锈钢氩弧焊缝表面进行了喷丸处理,通过光学显微镜和扫描电镜对材料表面及断口的微观组织进行了观察,用X射线应力衍射仪测试了喷丸处理前后试样的残余应力,并进行了在NaCl水溶液中的应力腐蚀试验.结果表明：喷丸处理前,AISI304不锈钢焊缝在NaCl溶液中具有明显的应力腐蚀开裂敏感性,应力腐蚀裂纹断口表现为脆性断裂,属于穿晶型裂纹:喷丸处理后表面获得了组织细化的硬化层,残余压应力有极大提高,有效地降低了不锈钢焊缝的应力腐蚀开裂倾向.

The welding line surface of AISI304 stainless steel was processed by shot-peening treatment,the microstructures of the material surface were observed with optical microscope and scanning electron microscope.The residual stresses of the sample by peening treatment were measured with X-ray stress tester, and the stress corrosion experiment in NaCl aqueous solution was processed.The results show that welding line of AISI304 stainless steel has obvious crack sensitivity of stress corrosion in NaCl aqueous solution;the crack is behaved with brittle rupture,which is transgranular crack;the refined hardened-layer is acquired on the welding line surface of AISI304 stainless steel by shot-peening treatment,and the compressive residual stress has greatly increased,which effectively decreases the stainless steel crack in stress corrosion.