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| Nonequilibrium Grain Boundary Segregation of Phosphorus in Ni-Cr-Fe Superalloy |
| WANG Kai, SI Hong, YANG Chun, XU Ting��dong |
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Abstract 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.
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Received: 16 December 2009
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2011, Vol. 18 
