Abstract
A geometric model for intergranular stress corrosion cracking (IGSCC) is presented and used to evaluate the influence of grain boundary structure on the IGSCC resistance of polycrystalline materials. Preliminary observations regarding the structure of intergranular fracture paths in Alloy 600 C-ring specimens exposed to high temperature caustic media are noted to be consistent with the general predictions of the proposed geometric model and demonstrate that significant enhancement to bulk IGSCC resistance may be achieved through material processing considerations which result in (1) moderate increases in the frequency of structurally ’special’ grain boundaries (i.e., interfaces close to low Σ CSL’s) and (2) refinement in grain size.
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Acknowledgements
The authors would like to thank Ontario Hydro for permission to publish this work. Assistance with EBSP measurements provided by Dr. Ross Underhill and the Alcan Kingston Research and Development Laboratories is also gratefully acknowledged. Several of the authors (GP, PJK, PCL) would also like to thank their colleagues in the Metallurgical Research Department of Ontario Hydro for assistance with this study. Financial support (UE, KTA) from the Natural Sciences and Engineering Research Council of Canada is also gratefully acknowledged.
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Palumbo, G., King, P.J., Lichtenberger, P.C. et al. Grain Boundary Structure Control for Intergranular Stress-Corrosion Resistance. MRS Online Proceedings Library 238, 311–316 (1991). https://doi.org/10.1557/PROC-238-311
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DOI: https://doi.org/10.1557/PROC-238-311