High temperature creep in a <001> single crystal nickel-base superalloy
- Swedish Inst. for Metals Research, Stockholm (Sweden)
Creep data at 982 C and 950 C have been presented for the single crystal alloy CMSX-4. At these temperatures the creep rate is initially very low and 50% of the creep life is consumed in reaching {approximately}1% strain. Some steady-state creep occurred at 950 C. Low strains are important; plots of log, strain rate versus log, strain give more weight to low strains and also showed that tertiary creep is strain controlled. A linear strain softening approach described the increase in creep rate reasonably well. Creep curves, where time had been normalized with respect to the rupture life, could be superimposed at a given temperature, in spite of widely differing rupture lives. Normalized creep curves can only be superimposed if primary creep is negligible, but could be used as a means of estimating the rupture life of a long term test after a few millistrains have been reached.
- OSTI ID:
- 529523
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 4 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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