Thermal stress relieving of dilute uranium alloys
The kinetics of thermal stress relieving of uranium - 2.3 wt. % niobium, uranium - 2.0 wt. % molybdenum, and uranium - 0.75 wt. % titanium are reported and discussed. Two temperature regimes of stress relieving are observed. In the low temperature regime (T < 300/sup 0/C) the process appears to be controlled by an athermal microplasticity mechanism which can be completely suppressed by prior age hardening. In the high temperature regime (300/sup 0/C < T < 550/sup 0/C) the process appears to be controlled by a classical diffusional creep mechanism which is strongly dependent on temperature and time. Stress relieving is accelerated in cases where it occurs simultaneously with age hardening. The potential danger of residual stress induced stress corrosion cracking of uranium alloys is discussed. It is shown that the residual stress relief which accompanies age hardening of uranium - 0.75% titanium more than compensates for the reduction in K/sub ISCC/ caused by aging. As a result, age hardening actually decreases the susceptibility of this alloy to residual stress induced stress corrosion cracking.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6748474
- Report Number(s):
- SAND-80-1441C; CONF-801061-5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
ACTINIDE ALLOYS
AGE HARDENING
ALLOYS
CHEMICAL REACTIONS
CORROSION
HARDENING
KINETICS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
RELAXATION
STRESS CORROSION
STRESS RELAXATION
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS
URANIUM ALLOYS
URANIUM BASE ALLOYS