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A through-process, thermomechanical model for predicting welding-induced microstructure evolution and post-weld high-temperature fatigue response
Mac Ardghail, Padraig; Harrison, Noel; Leen, Sean B.
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. This research is funded by Science Foundation Ireland grant number SFI/14/IA/2604. The authors would like to acknowledge the contributors to this research; NUI Galway, the Ryan Institute, General Electric (UK), ESB International, University of Limerick, Imperial College, London and Fraunhofer IWM, Freiburg. 2020-02-11
Keyword(s): Finite-element; Welding; Fatigue; Microstructure; Constitutive; POWER-PLANT STEELS; RESIDUAL-STRESS; IV FRACTURE; SIMULATION; SUPPRESSION; JOINTS; FIELD; PIPE
Publication Date:
2019
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Contributor(s): Science Foundation Ireland
Institution: NUI Galway
Publisher(s): Elsevier
File Format(s): application/pdf
First Indexed: 2019-12-01 06:30:18 Last Updated: 2019-12-01 06:30:18