Transient Effects in Creep of Sanicro 25 Austenitic Steel and Their Modelling

Transient effects upon stress changes during creep of the new Sanicro 25 steel were investigated experimentally using the helicoid spring specimen technique. The creep behaviour was found to be qualitatively the same as that observed earlier with the creep-resistant 9% Cr ferritic-martensitic P-91 s...

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Bibliographic Details
Published in:Metals (Basel ) 2019-02, Vol.9 (2), p.245
Main Authors: Kloc, Luboš, Sklenička, Václav, Dymáček, Petr
Format: Article
Language:English
Subjects:
Austenitic stainless steels
creep
Creep rate
Creep strength
Creep tests
Experiments
Ferritic stainless steels
Finite element method
high temperature steels
Martensitic stainless steels
Metal fatigue
Modelling
Sanicro 25
Steel
Stress relaxation
Temperature
transient effects
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Summary:Transient effects upon stress changes during creep of the new Sanicro 25 steel were investigated experimentally using the helicoid spring specimen technique. The creep behaviour was found to be qualitatively the same as that observed earlier with the creep-resistant 9% Cr ferritic-martensitic P-91 steel, but the transient strains are considerably smaller. Negative creep rate, which is strain running against the applied stress, was observed with any stress decrease. Parameters for the complex creep model were estimated and model results were compared to the creep rates measured experimentally. The model can be used for the finite element method modelling of the creep and stress relaxation effects in the components made from the Sanicro 25 steel.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9020245