Exploratory time-dependent fatigue behavior of 2 1/4 Cr-1 Mo and modified 9 Cr-1 Mo steel. Status report
We review various aspects of time-dependent fatigue behavior of 2 1/4 Cr-1 Mo steel. Specifically, the roles of dynamic strain aging, environmental interaction, and classical creep damage (voidage) are discussed. Examples of results from exploratory test efforts show the strong waveform-environment synergism that occurs in this material. Plans are presented for future exploratory time-dependent fatigue testing of 2 1/4 Cr-1 Mo steel. Results indicate that the continuous-cycle fatigue resistance of modified 9 Cr-1 Mo is superior to that of standard 9 Cr-1 Mo steel and annealed 2 1/4 Cr-1 Mo steel in the high-cycle region. Limited results from time-dependent fatigue tests on modified 9 Cr-1 Mo steel have indicated that compressive hold periods are more damaging than tensile holds and that cyclic waveform effects similar to those seen in 2 1/4 Cr-1 Mo steel also occur in modified 9 Cr-1 Mo steel. 26 figures, 5 tables.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 706535
- Report Number(s):
- ORNL/TM-7699
- Resource Relation:
- Other Information: PBD: Jun 1981
- Country of Publication:
- United States
- Language:
- English
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