Tensile properties of V-Cr-Ti alloys after exposure in oxygen-containing environments
- Argonne National Lab., IL (United States)
A systematic study was conducted to evaluate the oxidation kinetics of V-4Cr-4Ti (44 alloy) and V-5Cr-5Ti alloys (55 alloy) and to establish the role of oxygen ingress on the tensile behavior of the alloys at room temperature and at 500 C. The oxidation rate of the 44 alloy is slightly higher than that of the 55 alloy. The oxidation process followed parabolic kinetics. Maximum engineering stress for 55 alloy increased with an increase in oxidation time at 500 C. The maximum stress values for 55 alloy were higher at room temperature than ta 500 C for the same oxidation treatment. Maximum engineering stresses for 44 alloy were substantially lower than those for 55 alloy in the same oxidation {approx}500 h exposure in air at 500 C; the same values were 4.8 and 6.1%, respectively, at 500 C after {approx}2060 h oxidation in air at 500 C. Maximum engineering stress for 44 alloy at room temperature was 421.6--440.6 MPa after {approx}250 h exposure at 500 C in environments with a pO{sub 2} range of 1 {times} 10{sup {minus}6} to 760 torr. The corresponding uniform and total elongation values were 11--14.4% and 14.5--21.7%, respectively. Measurements of crack depths in various specimens showed that depth is independent of pO{sub 2} in the preexposure environment and was of 70--95 {micro}m after 250--275 h exposure at 500 C.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- OSTI ID:
- 335377
- Report Number(s):
- DOE/ER-0313/23; ON: DE98004697; TRN: 99:005167
- Resource Relation:
- Other Information: PBD: Mar 1998; Related Information: Is Part Of Fusion materials semiannual progress report for the period ending December 31, 1997; Burn, G. [ed.] [comp.]; PB: 390 p.
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION
THERMONUCLEAR REACTOR MATERIALS
VANADIUM BASE ALLOYS
CHROMIUM ALLOYS
TITANIUM ALLOYS
OXIDATION
TEMPERATURE DEPENDENCE
PRESSURE DEPENDENCE
TENSILE PROPERTIES
AMBIENT TEMPERATURE
TEMPERATURE RANGE 0400-1000 K
EXPERIMENTAL DATA
MICROSTRUCTURE
CRACK PROPAGATION