An evaluation of current models for the propagation of stress-corrosion cracks
The current models for SCC are described and evaluated in terms of existing fractographic evidence. It is concluded that the film-rupture model, which is considered to advocate propagation by continuous anodic dissolution, is consistent with the fractography of the majority of intergranular failures but cannot be reconciled with that of transgranular SCC. The latter appears to occur by discontinuous cleavage and is best accounted for by a bulk-embrittlement mechanism such as hydrogen embrittlement or the model based on selective dissolution. The fractographic evidence suggests that certain intergranular failures may also occur discontinuously, again indicating that a bulk-embrittlement model may be operative. In its present form, the tunnel model does not appear to be consistent with the fractographic observations, nor does the adsorption model seem to have wide application. The tarnish-rupture model, proposed for the brass-ammonia system, is also discarded on the basis of the fractographic evidence.
- Research Organization:
- Univ. of Illinois, Urbana
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 5487990
- Journal Information:
- TMS Pap. Sel.; (United States), Journal Name: TMS Pap. Sel.; (United States); ISSN TMPSA
- Country of Publication:
- United States
- Language:
- English
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