A mechanism for transgranular stress-corrosion cracking View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1993-03

AUTHORS

W. F. Flanagan, Lijun Zhong, B. D. Lichter

ABSTRACT

A model is proposed to explain transgranular-stress corrosion cracking (T-SCC) in face-centered cubic (fcc) materials. Crack propagation is shown to be anisotropic, in that growth near {110} < 001> is discontinuous due to crack arrest by dislocation blunting whereas growth away from this growth orientation is continuous. For the former case, renucleation of arrested cracks involves active dissolution of shear bands at the crack tip, which changes the stress state at Lomer-Cottrell locks, causing them to fail by cleavage. Once the crack is nucleated, its instantaneous macroscopic crack-growth velocity is considered to be comprised of multiple nucleation of microcracks with intervening arrests. This microcracking results from the interaction of the stress fields from neighboring cracks which are forming simultaneously, the crack-opening constraint due to ligaments which act as “bridges” behind the crack front, and the localized dissolution at the microcrack tip which affectsKIC and leads to the “cobblestone” appearance. Experimental evidence and theoretical considerations are presented to support the model. The system studied was Cu-25 at. pct Au in 0.6 M NaCl solution at potentials between 300 and 400 mV (sce), which precludes hydrogen embrittlement. More... »

PAGES

553-559

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02656625

DOI

http://dx.doi.org/10.1007/bf02656625

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1046543588


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