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The effect of ferrite phases on the micromechanical response and crack initiation in the inter-critical heat-affected zone of a welded 9Cr martensitic steel
Date
2018
Abstract
This paper presents a crystal plasticity model to predict the tensile response and crack initiation in a mixed ferrite-martensite material with a low volume fraction of pro-eutectoid ferrite, representative of a welding-induced inter-critical heat-affected zone (IC-HAZ). It is shown that small volume fractions of ferrite can have a significant effect on material strength and ductility depending on the ferrite grain orientation. For relatively â softâ ferrite grains, micro-cracks can grow across inter-ferrite ligaments with damage accumulating in the ferrite, leading to a reduction in strength and strain hardening, but with little influence on ductility; in contrast, relatively â hardâ ferrite grains act to accelerate micro-crack initiation, leading to reduced ductility, with negligible influence on strain hardening up to the maximum load.
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Description
peer-reviewed
Publisher
John Wiley & Sons, Inc.
Citation
Fatique and Fracture of Engineering Materials and Structures;41(6),pp. 1245-1259
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Funding Information
Science Foundation Ireland (SFI), Irish Centre for High-End Computing (ICHEC)