Affiliation: | ( Liu Jie, Liu Jinming and Du Dongfang, College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024. Fan Guangwei and Li Guoping, Taiyuan Iron and Steel (Group) Company Ltd. , Taiyuan, 030003. Han Peide, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024. Liu Jie, Corresponding author, E-mail: liujie630812@ 126. com) |