Thermo-Chemical Process of Aluminizing of the Nickel-Base Superalloy
The thermo-chemical treatment routes for Renè77 superalloy were developed comprising low activity and high activity aluminizing by CVD method. The influence of the treatment on the oxidation resistance in air and creep resistance of the alloy was examined. The cyclic oxidation tests at 1100°C for 500 cycles were carried out. Creep tests were performed at 982°C at the stress level of 124 and 151.7MPa. The chemical and phase composition of the surface layer was analyzed after aluminizing. It was found that aluminide coating enhanced oxidation resistance of the Renè77 superalloy without deterioration of its mechanical properties.
M. Poręba et al., "Thermo-Chemical Process of Aluminizing of the Nickel-Base Superalloy", Materials Science Forum, Vol. 674, pp. 81-88, 2011