On apparent activation energies of creep in nickel-base superalloys
- Univ. Nacional del Centro de la Provincia de Buenos Aires (Argentina). Inst. de Fisica de Materiales Tandil
- Univ. de Buenos Aires (Argentina). Dept. de Fisica
Generally, the steady state is well defined in the creep curve in pure metals and some single-phase alloys. In this case, the diagram log {dot {epsilon}} vs. {epsilon} (where {epsilon} is the plastic strain) shows an extensive range of strain where the steady-state creep rate is maintained approximately constant. However, in those materials which present an unstable substructure, such as the particle strengthened alloys, the strain rate reaches a momentary minimum value instead of a steady-state creep rate. In this way, the minimum creep rate is observed in a regime of unstable transition. In this work, a study of the apparent activation energy of creep for IN-X750 was performed, using the differential temperature step technique. The tests were carried out near the minimum strain rate in order to analyze the influence of the material substructure on the values of the apparent activation energy.
- OSTI ID:
- 691353
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 41; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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