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A Grain Boundary Engineering Approach to Materials Reliability

Published online by Cambridge University Press:  10 February 2011

G. Palumbo,
E. M. Lehockey,
P. Lin,
U. Erb and
K. T. Aust
G. Palumbo
Affiliation:
Materials Technology Department, Ontario Hydro Technologies, 800 Kipling Avenue, KR270, Toronto, Canada, M8Z 5S4
E. M. Lehockey
Affiliation:
Materials Technology Department, Ontario Hydro Technologies, 800 Kipling Avenue, KR270, Toronto, Canada, M8Z 5S4
P. Lin
Affiliation:
Materials Technology Department, Ontario Hydro Technologies, 800 Kipling Avenue, KR270, Toronto, Canada, M8Z 5S4Dept. of Metallurgy and Materials Science, University of Toronto, Toronto, Canada M5S 1A4
U. Erb
Affiliation:
Materials Technology Department, Ontario Hydro Technologies, 800 Kipling Avenue, KR270, Toronto, Canada, M8Z 5S4Dept. of Materials and Metallurgical Engineering, Queen's University, Kingston, Canada K7L, 3N6
K. T. Aust
Affiliation:
Dept. of Metallurgy and Materials Science, University of Toronto, Toronto, Canada M5S 1A4
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Abstract

Intergranular degradation processes, (e.g., corrosion, stress corrosion, cracking, creep cracking) are a frequent cause of premature and unpredictable service failure of engineering components. Recent advances in (1) understanding structure-property relationships for grain boundaries, and (2) characterization techniques for grain boundaries in polycrystalline materials, have provided the means for improved component lifetime prediction, and the opportunity to engineer intergranular-degradation resistant microstructures.

In this work, we present our previously developed geometric models for grain boundary structure and grain size effects on intergranular degradation susceptibility. Specific examples are presented of the successful application of the ‘grain boundary engineering’ approach to the prediction and mitigation of intergranular corrosion, stress corrosion cracking, and creep cracking in Ni-based materials.

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References

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