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Grain Boundary Structure Control for Intergranular Stress-Corrosion Resistance

Published online by Cambridge University Press:  25 February 2011

G. Palumbo,
P. J. King,
P. C. Lichtenberger,
K. T. Aust and
U. Erb
G. Palumbo
Affiliation:
Ontario Hydro Research Division, 800 Kipling Avenue, Toronto, Canada M8Z 5S4
P. J. King
Affiliation:
Ontario Hydro Research Division, 800 Kipling Avenue, Toronto, Canada M8Z 5S4
P. C. Lichtenberger
Affiliation:
Ontario Hydro Research Division, 800 Kipling Avenue, Toronto, Canada M8Z 5S4
K. T. Aust
Affiliation:
Dept. of Metallurgy and Materials Science, University of Toronto, Toronto, Canada M5S 1A4
U. Erb
Affiliation:
Dept. of Materials and Metallurgical Engineering, Queen's University, Kingston, Canada K7L 3N6
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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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References

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