Thermo-mechanical fatigue of the monocrystalline nickel-base superalloy CMSX-6
- Univ. Erlangen-Nuernberg, Erlangen (Germany). Inst. fuer Werkstoffwissenschaften
Total strain-controlled thermo-mechanical fatigue (TMF) tests were performed between 600 and 1,100 C on as-grown near to [001]-orientated specimens of the {gamma}{prime} precipitate-strengthened monocrystalline nickel-base superalloy CMSX-6. The strain-temperature cycle (in-phase, out-of-phase, diamond) has a strong influence on the mechanical and microstructural events occurring during TMF. For given temperature intervals, the fatigue lives were shortest for out-of-phase tests and longest for in-phase tests, respectively. For all cycle shapes applied, the maximum tensile stress level was concluded to be the lifetime-limiting factor. The failure mode of the investigated alloy depends also on the conducted strain-temperature history. While strongly localized crystallographic shearing along {l_brace}111{r_brace} planes was dominant for in- and out-of-phase cycling, creep-induced damage occurred in diamond cycle tests. The evolution and coarsening of the microstructure were also studied. The latter is compared with the formation of stress-, strain- and diffusion-induced coarsened raft-like structures found in creep testing of similar materials.
- OSTI ID:
- 531467
- Report Number(s):
- CONF-941159-; ISBN 0-8031-2001-X; TRN: IM9743%%3
- Resource Relation:
- Conference: 2. symposium on thermomechanical fatigue behavior of materials, Phoenix, AZ (United States), 14-15 Nov 1994; Other Information: PBD: 1996; Related Information: Is Part Of Thermomechanical fatigue behavior of materials: Second volume; Verrilli, M.J. [ed.] [NASA Lewis Research Center, Cleveland, OH (United States)]; Castelli, M.G. [ed.] [NYMA, Inc., Brook Park, OH (United States)]; PB: 384 p.; ASTM special technical publication, 1263
- Country of Publication:
- United States
- Language:
- English
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