Nonequilibrium Grain Boundary Segregation of Phosphorus in Ni-Cr-Fe Superalloy  

作　　者：WANG Kai SI Hong YANG Chun XU Ting-dong 

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1期61-67,共7页

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

摘　　要：In virtue of Auger electron spectroscopy, the grain boundary concentrations of phosphorus in Ni-Cr-Fe superalloy are measured after solution treatment at 1 180 ℃ for 45 min. The results show that a peak of phosphorus concentration occurs at about 180 min during isothermal ageing at 500 ℃, and a maximum concentration of phosphorus appears also at about 500 ℃ for all specimens aged for 20 min at temperatures of 200, 400, 500, 700 and 800 ℃. The results are analyzed with the laws of nonequilibrium grain boundary segregation. It is found from the analysis that peaks are related to critical time for nonequilibrium grain boundary segregation of phosphorus.In virtue of Auger electron spectroscopy, the grain boundary concentrations of phosphorus in Ni-Cr-Fe superalloy are measured after solution treatment at 1 180 ℃ for 45 min. The results show that a peak of phosphorus concentration occurs at about 180 min during isothermal ageing at 500 ℃, and a maximum concentration of phosphorus appears also at about 500 ℃ for all specimens aged for 20 min at temperatures of 200, 400, 500, 700 and 800 ℃. The results are analyzed with the laws of nonequilibrium grain boundary segregation. It is found from the analysis that peaks are related to critical time for nonequilibrium grain boundary segregation of phosphorus.

关 键 词：nonequilibrium segregation grain boundary PHOSPHORUS nickel based superalloy 

分 类 号：TQ153.19[化学工程—电化学工业] TG146.21[一般工业技术—材料科学与工程]