Interface between fatigue, creep and stress-corrosion cracking on Ti6246 titanium alloy
The influence of mean stress on the fatigue crack growth behavior of a Ti6246 alloy has been studied in the near-threshold area at room temperature and at 500 C. Tests were performed at various constant K{sub max} levels in ambient air, high vacuum and humidified Argon. Conditions for the occurrence of an abnormal behavior consisting in the disappearance of the threshold for sufficiently high K{sub max} level, are discussed with respect to environment and temperature. This effect is observed in air and in vacuum for K{sub max} higher than 52 MPa{radical}m, and is related to an intrinsic creep damage process which appears more efficient at room temperature than at 500 C and more accentuated in air than in vacuum. In humidified Argon, the critical Kmax level is reduced at 22 MPa{radical}m at 500 C, such a detrimental effect being related to a Stress Corrosion Cracking process induced by water vapor.
- Research Organization:
- ENSMA, Futuroscope (FR)
- OSTI ID:
- 20013323
- Resource Relation:
- Conference: TMS Fall Meeting '98, Symposium on Fatigue Behavior of Titanium Alloys, Chicago, IL (US), 10/11/1998--10/15/1998; Other Information: PBD: 1999; Related Information: In: Fatigue behavior of titanium alloys, by Boyer, R.R.; Eylon, D.; Luetjering, G. [eds.], 382 pages.
- Country of Publication:
- United States
- Language:
- English
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