The roles of microstructure and mechanics in intergranular stress corrosion cracking

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The roles of microstructure and mechanics in intergranular stress corrosion cracking

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Publication Conference Paper, peer reviewed
Title The roles of microstructure and mechanics in intergranular stress corrosion cracking
Author(s) Jivkov, Andrey ; Stevens, N.P.C. ; Marrow, T.J.
Date 2005
English abstract
Previous work on the prediction of intergranular stress corrosion cracking resistance in grain boundary engineered microstructures has used two dimensional percolation models, in which the grain boundaries are assumed to be either resistant or susceptible to cracking, depending on the grain boundary character. One limitation of such models is that they do not necessarily account for the mechanical crack driving force. Further, they cannot capture experimentally observed phenomena such as the formation of isolated ductile bridging ligaments by resistant boundaries. These arise due to the threedimensional character of crack propagation. A new mechanical crack propagation model is presented which, via finite element solutions, addresses these limitations. The model is based on a regular discrete representation of the materials microstructure and is applicable to both 2D and 3D behaviour. Results are reported for 2D-hexagonal microstructures, and are compared with percolation models. The results demonstrate the influence of stress on crack path, as well as the influence of the rupture strain of susceptible boundaries on crack behaviour. Further, the effect of crack bridging, which arises from ductile resistant boundaries is studied.
Host/Issue Simulation of electrochemical processes
Series/Issue WIT transactions on engineering sciences;48
ISSN 1746-4471
ISBN 1845640128
Pages 217-226
Language eng (iso)
Subject(s) Technology
Research Subject Categories::TECHNOLOGY
Note 1st International Conference on the Simulation of Electrochemical processes in Cadiz, Spain, May 2005
Handle http://hdl.handle.net/2043/4830 (link to this page)

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