Creep-Fatigue Life and Cyclic Constitutive Relation of MAR-M247 Directionally Solidified Superalloy at High Temperature
This paper describes the effect of solidification direction on creepfatigue life of Mar-M247 directionally solidified (DS) superalloy. The specimen of which axis agrees to the solidification direction exhibited the maximum life, while the specimen which has 45° against the solidification direction exhibits the minimum life. Transversely directed specimen had the intermediate life. The difference in creep-fatigue life due to the loading direction was resulted from the anisotropy of Young’s modulus. A life prediction method for DS superalloy, considering the anisotropy of the Young’s modulus, was proposed and successfully applied to the creep-fatigue data.
KeywordsFatigue Furnace Anisotropy
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