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.
|Title of host publication||Gaseous Hydrogen Embrittlement of Materials in Energy Technologies|
|Subtitle of host publication||Mechanisms, Modelling and Future Developments|
|Number of pages||52|
|Publication status||Published - Jan 1 2012|
All Science Journal Classification (ASJC) codes