Intergranular embrittlement of hydrogen in Fe-Si alloy and bicrystals and effects of the mobility of segregated hydrogen atoms
Effects of the mobility of segregated hydrogen atoms in intergranular embrittlement was tested in Fe-2.7wt.%Si bicrystals, and it is being tested in a Fe-Si alloy. Mechanical tests, including tensile tests, time dependent crack growth tests and measurements of J{sub IC} at ambient and cryogenic temperatures for specimens with and without hydrogen charging are conducted. The ductility or the brittleness of the interface at different temperatures, and thus, with various mobilities of the segregated hydrogen atoms, is evaluated. The results thus far support the interpretation that grain boundary segregation of hydrogen causes modest embrittlement at lower temperatures, but that the embrittlement is much greater when the hydrogen is mobile, as at the higher temperatures, and can move to the stressed interface during the separation process. This is consistent with theoretical models of the cohesion reduction by segregants, which predict far greater embrittlement when the chemical potential is constant during the fracture process than when the amount of segregant is constant.
- OSTI ID:
- 127776
- Report Number(s):
- CONF-920376-; ISSN 0003-0503; CNN: Contract DMR-89-20490; TRN: 95:007049-0032
- Journal Information:
- Bulletin of the American Physical Society, Vol. 37, Issue 9; Conference: Meeting of the American Physical Society, Indianapolis, IN (United States), 16-20 Mar 1992; Other Information: PBD: Dec 1992
- Country of Publication:
- United States
- Language:
- English
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