Applications of orientation imaging analysis to microstructural control of intergranular stress corrosion cracking
- 1 September 1995
- journal article
- research article
- Published by Taylor & Francis in Canadian Metallurgical Quarterly
- Vol. 34 (3) , 147-154
- https://doi.org/10.1016/0008-4433(95)00008-l
Abstract
Arguably, there is no more serious materials engineering problem than intergranular stress corrosion cracking (ISCC). Considerable evidence now exists to support the view that various aspects of grain boundary (GB) geometry, its distribution and spatial placement can be altered by processing to achieve beneficial reductions in ISCC susceptibility in some alloy systems. Orientation imaging microscopy (OIM) provides an important new tool to rapidly and quantitatively reveal those aspects of grain boundary geometry in polycrystalline materials that may be relevant to ISCC. Applications of the method of orientation imaging are briefly reviewed, with an emphasis on measuring the distribution of interface geometry.A new probabilistic model for crack propagation through a GB network is proposed. The process of crack advance across GB segments is modeled by a Markov chain. By assigning strengths to the GBs, the transition probability of a crack proceeding from one segment to another is calculated. From th...Keywords
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