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An Accelerated Creep Assessment Method Based on Inelastic Strain Partitioning and Slow Strain Rate Testing
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-8306-3987
2021 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Materials & Design, Vol. 205, article id 109697Article in journal (Refereed) Published
Abstract [en]

A new accelerated creep assessment method to evaluate the creep performance of metals and alloys from high-temperature tensile tests, i.e. slow-strain-rate testing (SSRT), is proposed and evaluated. The method consists of decomposing the inelastic strain into a plastic and creep component by adopting general assumptions on the inelastic strain behaviour of materials, formulated using a state variable formalism and verified by tensile tests with intermediate dwell times at constant stress. Either, the plastic and creep strain components are considered non-interacting and additive, as observed in the stainless steel AISI 316L at 600 °C. Or, as in the case of the ductile cast iron EN-GJS-SiMo5-1 at 500 °C and the nickel-base superalloy Hastelloy X at 800 °C, the components are considered unified, meaning that the effect of inelastic straining is the same irrespective of whether it is caused through creep at constant stress or by plastic deformation due to an instantaneous stress increase. Based on these assumptions, the proposed method is used to assess the creep strain from SSRT in good agreement with conventional creep test results.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 205, article id 109697
Keywords [en]
Creep, Slow-strain-rate testing, Stress relaxation, Constitutive behaviour, Metallic material
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-175764DOI: 10.1016/j.matdes.2021.109697ISI: 000663557800008Scopus ID: 2-s2.0-85104641343OAI: oai:DiVA.org:liu-175764DiVA, id: diva2:1555707
Note

Funding: Swedish Governmental Agency for Innovation SystemsVinnova [2018-04302]; Sandvik Materials Technology

Available from: 2021-05-19 Created: 2021-05-19 Last updated: 2021-07-05Bibliographically approved

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Norman, ViktorCalmunger, Mattias

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