Characterization of Intergranular Corrosion in Heat-affected Zone of Low Carbon 12Cr-Ni Ferritic Stainless Steel
Intergranular corrosion in heat-affected zone of low carbon 12Cr-Ni ferritic stainless steel was investigated by the method of practice Z in ASTM A 763-93. The microstructure of welded joint was characterized using an optical microscope and a scanning electronic microscope. Severe intergranular corrosion (IGC) was only observed in low temperature heat-affected zone (LTHAZ) adjacent to base metals at the back of the welded joints in unstabilized steel. On the other hand, IGC was not observed in the welded joints of stabilized steels. According to the analysis of microstructure, the severe IGC is attributed to both the precipitated phase along the grain boundaries inducing the presence of chromium-depleted zone and the welding residual tensile stress promoting the corrosion. Therefore, stabilized elements addition such as Ti and Nb is required in order to avoid the IGC in welded joint of these steels. Relief residual tensile stress by post weld heat treatment would also be an effective method to avoid the IGC in the welded joints of these steels.
Ferritic stainless steel Heat-affected zone Intergranular corrosion Residual stress
Huaibei ZHENG Xiaoning YE Zheng CAI Laizhu JIANG Zhenyu LIU Guodong WANG Baosen WANG
The State Key Laboratory of Rolling and Automation, Northeastern University,Shenyang 110004, China S Stainless Steel Technology Center, Research Institute, Baoshan Iron & Steel Co., Ltd.,Shanghai 20043 The State Key Laboratory of Rolling and Automation, Northeastern University,Shenyang 110004, China Welding & Surface Technology Division, Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai
国际会议
11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)
青岛
英文
260-268
2010-09-25（万方平台首次上网日期，不代表论文的发表时间）