Evaluating the Critical Temperature of Creep-Fatigue Interaction a Nickel-Based Powder Metallurgy Superalloy

Abstract:

For the components working in high temperature and enduring fatigue loading, the fatigue fracture properties will be reduced remarkably when the working temperature is higher than the critical temperature of creep-fatigue interaction T_c of the material. In consequence, the damage mechanism from creep-fatigue interaction becomes more complex. A method is presented in this paper to determine the T_c of a nickel-based powder metallurgy superalloy. Pure fatigue crack growth and creep-fatigue crack growth tests were conducted in several different elevated temperatures. The fracture mechanism was investigated via observing the fractographic characteristics using scanning electron microscope (SEM). The test results show that the T_c of this superalloy is a little bit lower than a half of the melting temperature T_m.

• Periodical: Key Engineering Materials (Volumes 577-578)
• Pages: 625-628
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.577-578.625
• Online since: September 2013
• Authors: Hao Liu, Rui Bao, Wei Ming Lei, Bin Jun Fei
• Keywords: Crack Growth, Creep Fatigue, Critical Temperature, Superalloy

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