Fatigue Crack Growth Behavior of Powder Metallurgical Nickel-based Superalloy using DCPD Method at Elevated Temperature

Title & Authors
Fatigue Crack Growth Behavior of Powder Metallurgical Nickel-based Superalloy using DCPD Method at Elevated Temperature
Na, Seonghyeon; Oh, Kwangkeun; Kim, Hongkyu; Kim, Donghoon; Kim, Jaehoon;

Abstract
Powder metallurgy nickel based superalloy has been used in a high temperature part of turbine engine for airplane. The fatigue crack growth behavior was investigated using CT specimens for the materials at room temperature(R.T.), $\small{600^{\circ}C}$ and $\small{700^{\circ}C}$. The direct current potential drop(DCPD) method suggested by ASTM E647 was used to measure the crack length during fatigue crack growth at various stress ratios. The fatigue crack growth rate at R=0.5 was faster than that at R=0.1 for all temperature conditions and increased with the increase of stress ratio and temperature. Fractography was conducted for analysis of fracture mechanism.
Keywords
Direct Current Potential Drop;Powder Metallurgy;Nickel Based Superalloy;Fatigue Crack Growth rate;
Language
Korean
Cited by
References
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