Data-based selection of creep constitutive models for high-Cr heat-resistant steel.
106 Metallic materials
404 Materials informatics / Genomics
Creep constitutive equation
bayesian free energy
grade 91 steel
model selection method
steady-state creep
theta method
Journal
Science and technology of advanced materials
ISSN: 1468-6996
Titre abrégé: Sci Technol Adv Mater
Pays: United States
ID NLM: 101614420
Informations de publication
Date de publication:
2020
2020
Historique:
received:
09
08
2019
revised:
25
12
2019
accepted:
19
01
2020
entrez:
4
6
2020
pubmed:
4
6
2020
medline:
4
6
2020
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 32489481
doi: 10.1080/14686996.2020.1738268
pii: 1738268
pmc: PMC7241477
doi:
Types de publication
Journal Article
Langues
eng
Pagination
219-228Informations de copyright
© 2020 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.