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A physically-based constitutive model for high temperature microstructural degradation under cyclic deformation

Barrett, Richard A.
; 
O'Donoghue, Padraic E.
; 
Leen, Sean B.
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Publication Date
2017-03-23
Keywords
THERMAL-MECHANICAL FATIGUE, DISLOCATION-BASED MODEL, STRAIN-RATE SENSITIVITY, ANGLE GRAIN-BOUNDARIES, MODIFIED 9CR-1MO STEEL, MARTENSITIC STEEL, THERMOMECHANICAL FATIGUE, P91 STEEL, LIFE PREDICTION, 9CR-ODS STEEL
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Citation
Barrett, Richard A., O'Donoghue, Padraic E., & Leen, Sean B. (2017). A physically-based constitutive model for high temperature microstructural degradation under cyclic deformation. International Journal of Fatigue, 100, 388-406. doi: https://doi.org/10.1016/j.ijfatigue.2017.03.018
Abstract
This paper presents a dislocation-mechanics cyclic viscoplasticity model which incorporates the key physical micro-mechanisms of strengthening and softening for high temperature deformation of 9Cr steels. In particular, these include precipitate and grain boundary strengthening, low-angle boundary dislocation annihilation and martensitic lath width evolution, using dislocation density as a key variable. The new model is applied to P91 steel across a range of strain-rates and strain-ranges in the 400-600 C temperature range, for power plant header applications, to demonstrate the effect of key microstructural parameters on high temperature low cycle fatigue performance. (C) 2017 Elsevier Ltd. All rights reserved.
Funder
Science Foundation Ireland
Publisher
Elsevier
Publisher DOI
10.1016/j.ijfatigue.2017.03.018
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Attribution-NonCommercial-NoDerivs 3.0 Ireland
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Mechanical Engineering (Scholarly Articles)