Mechanism-based modeling of thermal and irradiation creep behavior:An application to ferritic/martensitic HT9 steel

Wen, W. and Kohnert, A. and Arul Kumar, M. and Capolungo, L. and Tomé, C.N. (2020) Mechanism-based modeling of thermal and irradiation creep behavior:An application to ferritic/martensitic HT9 steel. International Journal of Plasticity, 126. ISSN 0749-6419

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In this work, the creep behavior of HT9 steel in both thermal and irradiation environments is predicted using an integrated modeling framework. Multiple physical mechanisms such as diffusional creep and dislocation climb are incorporated into crystal plasticity calculations using the Visco-Plastic Self-Consistent (VPSC) approach. Climb velocities are informed by mean field rate theory laws in place of empirical power law formulations. More interestingly, the climb velocities explicitly consider the contribution of irradiation-induced point defects, i.e., stress induced preferential absorption (SIPA) effect. The developed expressions are shown to apply under conventional thermal creep and to the more complex irradiation conditions as well. This physically-informed, mechanism-based model is used to simulate the creep strain evolution of HT9 pressurized tubes under various loading conditions. It is demonstrated that the experimental behavior of this material reported in the literature is well described by this theoretical framework. The role of each relevant mechanism is discussed.

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Journal Article
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International Journal of Plasticity
Additional Information:
This is the author’s version of a work that was accepted for publication in International Journal of Plasticity. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Plasticity, 126, 2020 DOI: 10.1016/j.ijplas.2019.11.012
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17 Feb 2020 12:30
Last Modified:
15 Sep 2023 01:04