WANG Kai
,
SI Hong
,
YANG Chun
,
XU Tingdong
钢铁研究学报(英文版)
In virtue of Auger electron spectroscopy, the grain-boundary concentrations of phosphorus in Ni-Cr-Fe superalloy after solution-treated at 1180℃ for 45 min are measured, 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 analysed with the laws of non-equilibrium grain-boundary segregation. It is found from the analysis that peaks are relative to critical time for non-equilibrium grain-boundary segregation of phosphorus.
关键词:
Non-equilibrium segregation;Grain boundaries;Phosphorus;Nickel based superalloys
