Influence of microstructures on thermal fatigue property of a nickel-base superalloy

Abstract

Effect of microstructures such as the distribution and shape of carbide and γ′ phase on thermal fatigue property of a superalloy was investigated experimentally. The resistance of thermal fatigue of the studied alloy decreases with the rising upper temperature. For the as-cast alloy, the thermal fatigue crack mostly origins from carbide at low upper temperature and results from oxidation at high upper temperature. The thermal fatigue crack of the heat treated alloy is mainly initiated by the oxidized cavity and then propagates through the join of the oxidized cavity. The orientation of crack propagation and direction of dendrite growth of alloy have the angle of 45°. There is γ′ denuded region near the thermal fatigue crack because of oxidation.

Keywords

nickel-base superalloy / thermal fatigue / microstructure / crack

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Higher Education Press and Springer-Verlag Berlin Heidelberg