Microstructure evolution and corrosion resistance in simulated CGHAZ of X80 high-deformability pipeline steel  

作　　者：赵伟 邹勇 邹增大 夏佃秀 

机构地区：[1]Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials Ministry of Education, Shandong University, Jinan, 250061. [2]School of Mechanical Engineering, Jinan University, Jinan, 250022.

出　　处：《China Welding》2015年第4期39-45,共7页中国焊接（英文版）

基　　金：This work was supported by The National Natural Science Foundation of China （No. 51271099）.

摘　　要：In this study, the microstructure evolution and corrosion resistance in O. 5 M Na2CO3 - 1 M NaHCO3 solution of X80 high-deformability （ X8OHD ） pipeline steel coarse-grained heat-affected zone （CGHAZ） with several heat input levels were investigated. It is shown that the microstructure of CGHAZ changes from bainite ferrite to granular bainite as the heat input increasing. In addition, the corrosion resistance and the stability of passive film of base material are better than those of CGHAZ with several heat input levels. Too small or too big heat input is inadvisable and better corrosion resistance of CGHAZ is attained when heat input is 30 kJ/cm.In this study, the microstructure evolution and corrosion resistance in O. 5 M Na2CO3 - 1 M NaHCO3 solution of X80 high-deformability （ X8OHD ） pipeline steel coarse-grained heat-affected zone （CGHAZ） with several heat input levels were investigated. It is shown that the microstructure of CGHAZ changes from bainite ferrite to granular bainite as the heat input increasing. In addition, the corrosion resistance and the stability of passive film of base material are better than those of CGHAZ with several heat input levels. Too small or too big heat input is inadvisable and better corrosion resistance of CGHAZ is attained when heat input is 30 kJ/cm.

关 键 词：X80HD pipeline steel coarse-grained heat-affected zone （CGHAZ） corrosion resistance high-pH solution 

分 类 号：TG457.11[金属学及工艺—焊接] TM912.1[电气工程—电力电子与电力传动]