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There are two types of creep constitutive equation, one with a steady-state term (steady-state type) and the other with no steady-state term (non-steady-state type). We applied the Bayesian inference framework in order to examine which type is supported by experimental creep curves for a Grade 91 (Gr.91) steel. The Bayesian free energy was significantly lower for the steady-state type under all the test conditions in the ranges of 50–90 MPa at 923 K, 90–160 MPa at 873 K and 170–240 MPa at 823 K, leading to the conclusion that the posterior probability was virtually 1.0. These findings mean that the experimental data supported the steady-state-type equation. The dependence of the evaluated steady-state creep rate on the applied stress indicates that there is a transition in the mechanism governing creep deformation around 120 MPa.

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• Creative Commons BY Attribution 4.0 International
  

  Creative Commons BY Attribution 4.0 International

Keyword: theta method, Creep constitutive equation, model selection method, bayesian free energy, steady-state creep, grade 91 steel

Date published: 2020-01-31

Publisher: Taylor & Francis

Journal:

• Science and Technology of Advanced Materials (ISSN: 14686996) vol. 21 issue. 1 p. 219-228

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1080/14686996.2020.1738268

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Updated at: 2024-01-05 22:12:23 +0900

Published on MDR: 2022-10-31 11:55:49 +0900