Fatigue damage characterisation of MarBN steel for high temperature flexible operating conditions

This article is concerned with the high temperature low cycle fatigue behaviour of a new nano-strengthened martensitic-ferritic steel, MarBN. A range of strain-controlled, low cycle fatigue tests are presented on MarBN at 600 ℃ and 650 ℃, and compared with previously published data for a current sta...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part L, Journal of materials, design and applications Journal of materials, design and applications, 2017-02, Vol.231 (1-2), p.23-37
Main Authors: O’Hara, EM, Harrison, NM, Polomski, BK, Barrett, RA, Leen, SB
Format: Article
Language:English
Subjects:
Constitutive models
Damage
Fatigue failure
Fatigue tests
Ferritic stainless steels
Fracture mechanics
Heat resistant steels
High temperature
Life prediction
Low cycle fatigue
Martensitic stainless steels
Mathematical models
Metal fatigue
Microstructural analysis
Optimization
Parameter identification
Strain rate
Viscoplasticity
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Summary:This article is concerned with the high temperature low cycle fatigue behaviour of a new nano-strengthened martensitic-ferritic steel, MarBN. A range of strain-controlled, low cycle fatigue tests are presented on MarBN at 600 ℃ and 650 ℃, and compared with previously published data for a current state-of-the-art material, P91 steel, including microstructural analysis of the fracture mechanisms. A modified Chaboche damage law, incorporating Coffin–Manson life prediction, is implemented within a hyperbolic sine unified cyclic viscoplastic constitutive model. Calibration and validation of the model with respect to the effects of strain-rate and strain-range is performed based on an optimisation procedure for identification of the material parameters. The cyclic viscoplasticity model with damage successfully predicts fatigue damage evolution and life in the cyclically softening materials, MarBN and P91.
ISSN:1464-4207
2041-3076
DOI:10.1177/1464420716667759