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International Hydrogen Conference (IHC 2016): Materials Performance in Hydrogen Environments

Editor
B. P. Somerday
B. P. Somerday
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P. Sofronis
P. Sofronis
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ISBN:
9780791861387
No. of Pages:
800
Publisher:
ASME Press
Publication date:
2017

A two-dimensional numerical mesoscale model has been created representing a microstructure of a typical 2205/1.4462 duplex stainless steel to further elucidate the mechanisms of hydrogen-assisted crack initiation and propagation in multiphase non-hydride forming metallic microstructures. Hydrogen-assisted cracking (HAC) was simulated by considering different stress and strain behavior as well as different diffusion behavior in both phases. For simulation of crack initiation and propagation, the element elimination technique has been applied. The model allows the simulation of path-free crack propagation which contributes to a better understanding of the HAC process in two-phase microstructures. As a particular result, the analyses revealed that a global macroscopic elastic deformation might already cause plastic deformation in both phases entailing respective HAC.

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