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Modelling Intergranular Stress Corrosion Cracking in Simulated Three-Dimensional Microstructures

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Abstract:

Microstructure can have a significant effect on the resistance to intergranular stress corrosion cracking. Certain grain boundaries are susceptible to corrosion while others have high resistance and may form crack bridging ligaments as the crack deviates around them. To investigate the mechanics of crack bridging, 3D computational model has been previously developed. An extension to the model, to include stress corrosion crack growth kinetics is presented in this paper. An analysis of the effects of resistant grain boundary fraction demonstrates that the bridging ligaments can significantly retard short crack propagation rates. Increasing the fraction of resistant boundaries is shown to improve microstructure resistance by reducing the crack propagation rate.

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Periodical:

Key Engineering Materials (Volumes 345-346)

Pages:

1019-1022

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.345-346.1019

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Cite this paper

Online since:

August 2007

Authors:

Andrey P. Jivkov, Nicholas.P.C. Stevens, T.James Marrow

Keywords:

Crack Bridging, Finite Element Analysis Method, Grain Boundary, Microstructure, Stress Corrosion Cracking (SCC)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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