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Application of Fundamental Models for Creep Rupture Prediction of Sanicro 25 (23Cr25NiWCoCu)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China.ORCID iD: 0000-0002-8348-1633
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-8494-3983
2019 (English)In: Crystals, ISSN 2073-4352, Vol. 9, no 12, article id 638Article in journal (Refereed) Published
Abstract [en]

Creep rupture prediction is always a critical matter for materials serving at high temperatures and stresses for a long time. Empirical models are frequently used to describe creep rupture, but the parameters of the empirical models do not have any physical meanings, and the model cannot reveal the controlling mechanisms during creep rupture. Fundamental models have been proposed where no fitting parameters are involved. Both for ductile and brittle creep rupture, fundamental creep models have been used for the austenitic stainless steel Sanicro 25 (23Cr25NiWCoCu). For ductile creep rupture, the dislocation contribution, solid solution hardening, precipitation hardening, and splitting of dislocations were considered. For brittle creep rupture, creep cavitation models were used taking grain boundary sliding, formation, and growth of creep cavities into account. All parameters in the models have been well defined and no fitting is involved. MatCalc was used for the calculation of the evolution of precipitates. Some physical parameters were obtained with first-principles methods. By combining the ductile and brittle creep rupture models, the final creep rupture prediction was made for Sanicro 25. The modeling results can predict the experiments at long-term creep exposure times in a reasonable way.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 12, article id 638
Keywords [en]
creep, fundamental models, Sanicro 25, creep cavitation, austenitic stainless steels
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-267183DOI: 10.3390/cryst9120638ISI: 000506676000033Scopus ID: 2-s2.0-85075873852OAI: oai:DiVA.org:kth-267183DiVA, id: diva2:1391221
Note

QC 20200204

Available from: 2020-02-04 Created: 2020-02-04 Last updated: 2020-02-19Bibliographically approved

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He, JunjingSandström, Rolf

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