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

O’Hara, E., Harrison, N., Polomski, B., Barrett, R., & Leen, S. (2017). Fatigue damage characterisation of MarBN steel for high temperature flexible operating conditions. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 231(1–2), 23–37. https://doi.org/10.1177/1464420716667759

Abstract

This article is concerned with the high temperature low cycle fatigue behaviour of a new nano-strengthened martensiticferritic steel, MarBN. A range of strain-controlled, low cycle fatigue tests are presented on MarBN at 600 degrees C and 650 degrees C, 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.

Funder

Irish Research Council
GE Power

Publisher

SAGE Publications

Rights

Attribution-NonCommercial-NoDerivs 3.0 Ireland

cbn

Collections

Mechanical Engineering (Scholarly Articles)