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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

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posted on 2019-08-07, 09:48 authored by M. Li, Fengwei Sun, Dong-Feng Li, Padraic E. O'Donoghue, Sean B. Leen, Noel P. O'Dowd
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 ‘soft’ 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 ‘hard’ ferrite grains act to accelerate micro-crack initiation, leading to reduced ductility, with negligible influence on strain hardening up to the maximum load.

Funding

EASTERN ATLANTIC CONTINENTAL MARGIN

National Science Foundation

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History

Publication

Fatique and Fracture of Engineering Materials and Structures;41(6),pp. 1245-1259

Publisher

Wiley

Note

peer-reviewed

Other Funding information

SFI, Irish Centre for High-End Computing (ICHEC)

Rights

"This is the author version of the following article: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 , which has been published in final form at https://onlinelibrary.wiley.com/doi/abs/10.1111/ffe.12768. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. http://olabout.wiley.com/WileyCDA/Section/id-828039.html#terms

Language

English

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