Degradation models for hydrogen embrittlement

Mohsen Dadfarnia, Petros Sofronis, Brian P. Somerday, Dorian K. Balch, Philip Schembri

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

In this chapter, we present a solid mechanics modeling and simulation effort to elucidate the linking of the macroscopic embrittlement phenomenology to the features of the microstructural degradation mechanisms ahead of a crack tip in the austenitic Fe-Ni-Co alloy IN903. In general, we find that the deformation and hydrogen fields in the fracture process depend strongly on the initial and boundary conditions, thus reflecting the variety of fracture modes. In particular, for intergranular crack growth in wedge opening load specimens in hydrogen gas we predict fracture process zones that are large in comparison to the typical characteristic diffusion distances. For ductile cracking in gaseous environments, we find that the process is controlled by the average spacing of the carbides.

Original languageEnglish
Title of host publicationGaseous Hydrogen Embrittlement of Materials in Energy Technologies
Subtitle of host publicationMechanisms, Modelling and Future Developments
PublisherElsevier Inc.
Pages326-377
Number of pages52
ISBN (Electronic)9780857095367
DOIs
Publication statusPublished - Jan 1 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Dadfarnia, M., Sofronis, P., Somerday, B. P., Balch, D. K., & Schembri, P. (2012). Degradation models for hydrogen embrittlement. In Gaseous Hydrogen Embrittlement of Materials in Energy Technologies: Mechanisms, Modelling and Future Developments (pp. 326-377). Elsevier Inc.. https://doi.org/10.1533/9780857095374.2.326