Characterisation of crack growth behaviour for W-added 12%Cr ferritic heat resistant steel under the creep-fatigue interaction conditions

The W-added 12%Cr ferritic heat resistant steel has been developed as a turbine rotor material which is used under high temperature creep-fatigue conditions. In this study, crack growth tests using C(T) specimen under the creep-fatigue interaction conditions were conducted under various conditions o...

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Bibliographic Details
Published in:Materials at high temperatures 2015-05, Vol.32 (3), p.280-288
Main Authors: Fukuda, T., Sugiura, R., Toshimitsu Yokobori, A., Matsuzaki, T.
Format: Article
Language:English
Subjects:
Alloys
Ceramics
Crack growth behaviour
Crack growth life
Crack initiation
Crack propagation
Creep (materials)
Creep-fatigue
Ferritic stainless steels
Heat
Heat resistant steels
High temperature
Martensitic stainless steels
Mechanical properties
Metal fatigue
Non-equilibrium science
Steels
Stresses
Three dimensional
Turbines
W-added 12%Cr steel
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Summary:The W-added 12%Cr ferritic heat resistant steel has been developed as a turbine rotor material which is used under high temperature creep-fatigue conditions. In this study, crack growth tests using C(T) specimen under the creep-fatigue interaction conditions were conducted under various conditions of stress holding time, applied stress and temperatures. As a result, the effect of load frequency on crack growth behaviour and its life for this steel was characterised by the three-dimensional curved surface based on the concept of non-equilibrium science. Furthermore, a predictive law of crack growth life under the creep-fatigue interaction conditions was derived based on the concept of Q* with the transition function of crack growth life from fatigue to creep.
ISSN:0960-3409
1878-6413
DOI:10.1179/0960340914Z.00000000069