A through-process, thermomechanical model for predicting welding-induced microstructure evolution and post-weld high-temperature fatigue response
Mac Ardghail, Padraig Harrison, Noel M. Leen, Sean B.
Mac Ardghail, Padraig
Harrison, Noel M.
Leen, Sean B.
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Identifiers
http://hdl.handle.net/10379/15596
https://doi.org/10.13025/18190
https://doi.org/10.13025/18190
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Publication Date
2018-02-11
Type
Article
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Mac Ardghail, P., Harrison, N., & Leen, S. B. (2018). A through-process, thermomechanical model for predicting welding-induced microstructure evolution and post-weld high-temperature fatigue response. International Journal of Fatigue, 112, 216-232. doi: https://doi.org/10.1016/j.ijfatigue.2018.02.015
Abstract
This paper is concerned with the development of a modelling framework to predict the effects of welding and post-weld heat treatment on thereto-mechanical performance of welded material, as a step towards a design tool for industry. A dislocation mechanics, through-process finite element model, incorporating thermal, micro structural and mechanical effects is presented, for predicting thereto-mechanical fatigue of welds. The model is applied to multi-pass gas tungsten arc welding of 9Cr martensitic steel. The predicted high-temperature low cycle fatigue performance of cross-weld samples is comparatively assessed for a range of different post-weld heat treatment durations. It is shown that longer post-weld heat-treatment (PWHT) durations increase the predicted number of cycles to failure and that Vickers hardness gradient across the heat-affected zone can be used as an indicator of fatigue life.
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Publisher
Elsevier
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Attribution-NonCommercial-NoDerivs 3.0 Ireland