Modelling intergranular stress corrosion cracking in simulated three-dimensional microstructures

A. P. Jivkov, N. P C Stevens, T James Marrow

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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.
    Original languageEnglish
    Pages (from-to)1019-1022
    Number of pages4
    JournalKey Engineering Materials
    Volume345-346
    DOIs
    Publication statusPublished - 2007

    Keywords

    • Crack bridging
    • Finite element analysis
    • Grain boundaries
    • Microstructure
    • Stress corrosion cracking

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