Nonequilibrium Grain Boundary Segregation of Sulfur and Its Effect on Intergranular Corrosion for 304 Stainless Steel  

作　　者：WANG Kai XU Ting-dong SHAO Chong YANG Chun 

机构地区：[1]Superalloy Department, Central Iron and Steel Research Institute, Beijing 100081, China [2]National Analysis Center of Iron and Steel, Central Iron and Steel Research Institute, Beijing 100081, China

出　　处：《Journal of Iron and Steel Research International》2011年第6期61-66,共6页

基　　金：Item Sponsored by National Natural Science Foundation of China(50771036,51001030)

摘　　要：The data obtained by bending tests for intergranular embrittlement after 45 h and 450 h exposure to Strauss solution have been reported for 304 stainless steel. The results show that an embrittlement peak appears at 650℃ for all samples quenched from 1260℃ and then sensitized for 150 h at 480, 565, 650, 730, 815 and 900℃ respectively. The temperature corresponding to the embrittlement peak is decreased to 565℃ when the sensitizing time is prolonged to 1 500 h. In this paper, these data are analyzed with an isothermal kinetic model of nonequilibrium grain boundary segregation, indicating that the embrittlement peak is related to the critical time for nonequilibrium grain boundary segregation of sulfur.The data obtained by bending tests for intergranular embrittlement after 45 h and 450 h exposure to Strauss solution have been reported for 304 stainless steel. The results show that an embrittlement peak appears at 650℃ for all samples quenched from 1260℃ and then sensitized for 150 h at 480, 565, 650, 730, 815 and 900℃ respectively. The temperature corresponding to the embrittlement peak is decreased to 565℃ when the sensitizing time is prolonged to 1 500 h. In this paper, these data are analyzed with an isothermal kinetic model of nonequilibrium grain boundary segregation, indicating that the embrittlement peak is related to the critical time for nonequilibrium grain boundary segregation of sulfur.

关 键 词：stainless steel intergranular corrosion nonequilibrium segregation grain boundary SULFUR 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TK124[金属学及工艺—金属材料]