Moisture-induced embrittlement of Fe sub 3 Al
Recent tests at ORNL indicate that the ductility of iron aluminides is very sensitive to the test environment. It is believed that the loss of ductility observed in moist air environments is associated with a hydrogen embrittlement phenomenon as a result of dissociation of water vapor and the intake of atomic hydrogen into the aluminide matrix. This possibility will be investigated in a series of tests under controlled environmental conditions. Compact specimens will be tested under controlled stress intensity conditions. Crack growth rates as a function of the applied stress intensity will be measured with the direct-current potential drop technique. Initial tests will be conducted in moist air and in vacuum at room temperature. In an additional series of tests the temperature of the moist air will be varied to permit the determination of an activation energy for the embrittlement process. Fractographic examination of the fracture surfaces will also be performed. It is anticipated that this series of test will increase our understanding of the environmentally-induced embrittlement of iron aluminide alloys. 2 refs., 1 fig.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6998941
- Report Number(s):
- CONF-900546-9; ON: DE90012413
- Resource Relation:
- Conference: 4. conference on fossil energy materials, Oak Ridge, TN (USA), 15-17 May 1990
- Country of Publication:
- United States
- Language:
- English
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Measurement of the critical level of moisture for initiation of water-vapor-induced environmental embrittlement in a Fe{sub 3}Al-based alloy
Measurement of the critical level of moisture for initiation of water-vapor-induced environmental embrittlement in a Fe[sub 3]Al-based alloy
Related Subjects
36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CRACK PROPAGATION
CHROMIUM ALLOYS
IRON BASE ALLOYS
NIOBIUM ALLOYS
CHARPY TEST
DUCTILITY
EMBRITTLEMENT
INTERMETALLIC COMPOUNDS
MOISTURE
ALLOYS
DESTRUCTIVE TESTING
IMPACT TESTS
IRON ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
TENSILE PROPERTIES
TESTING
010400* - Coal
Lignite
& Peat- Processing
360103 - Metals & Alloys- Mechanical Properties