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Residual stresses in P91 steel electron beam welds

Kundu, A.; Bouchard, P. J.; Kumar, S.; Venkata, K. A.; Francis, J. A.; Paradowska, A.; Dey, G. K. and Truman, C. E. (2013). Residual stresses in P91 steel electron beam welds. Science and Technology of Welding & Joining, 18(1) pp. 70–75.

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This paper describes the characterisation of residual stress in electron beam welded P91 ferritic– martensitic steel plates (9 mm thick) by neutron diffraction and contour measurement methods. The novelty of the work lies in revealing the residual stress profile at a fine length scale associated with a ∼1 mm wide fusion zone. A characteristic ‘M’ shaped distribution of stresses across the weld line is observed with high tensile peaks situated just beyond the heat affected zone/parent material boundary. Measured stresses close to the weld centreline are significantly less tensile than the adjacent peaks owing to martensitic phase transformation during cool down of the weld region. The effect of applying a second smoothing weld pass is shown to be undesirable from a residual stress standpoint because it increases the tensile magnitude and spread of residual stress. The results are suitable for validating finite element predictions of residual stress in electron beam welds made from ferritic–martensitic steels.

Item Type: Journal Item
Copyright Holders: 2013 Institute of Materials, Minerals and Mining. Published by Maney on behalf of the Institute
ISSN: 1362-1718
Keywords: ferritic–martensitic steel; neutron diffraction; type IV cracking; phase transformation
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 35087
Depositing User: Olivia Acquah
Date Deposited: 06 Nov 2012 12:04
Last Modified: 07 Dec 2018 10:09
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