|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Creep, Fatigue and Environmental Interactions and Their Effect on Crack Growth in Superalloys
||Jack Telesman, Tim Gabb, Louis Ghosn
|On-Site Speaker (Planned)
To gain an understanding of the complex creep/fatigue/environmental interactions in superalloys, a study of dwell and cyclic fatigue crack growth behavior was conducted on a powder metallurgy disk alloy given various heat treatments to vary creep resistance. Testing was conducted at elevated temperatures both in air and in vacuum. It was shown that environmental embrittlement was the dominant mechanism of crack advancement with creep crack growth having only a secondary effect. However crack tip stress relaxation did have a major, yet indirect, effect on the dwell crack growth by controlling the magnitude of the remaining crack tip tensile stresses which governed crack growth. A simple, empirically based correction to the linear elastic stress intensity factor was developed by considering the crack tip stress relaxation behavior.
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