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Surface residual stresses in multipass welds produced using low transformation temperature filler alloys

Ramjaun, T. I.; Stone, H. J.; Karlsson, L.; Gharghouri, M. A.; Dalaei, K.; Moat, R. J. and Bhadeshia, H. K. D. H. (2014). Surface residual stresses in multipass welds produced using low transformation temperature filler alloys. Science and Technology of Welding and Joining, 19(7) pp. 623–630.

DOI (Digital Object Identifier) Link: https://doi.org/10.1179/1362171814Y.0000000234
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Abstract

Tensile residual stresses at the surface of welded components are known to compromise fatigue resistance through the accelerated initiation of microcracks, especially at the weld toe. Inducement of compression in these regions is a common technique employed to enhance fatigue performance. Transformation plasticity has been established as a viable method to generate such compressive residual stresses in steel welds and exploits the phase transformation in welding filler alloys that transform at low temperature to compensate for accumulated thermal contraction strains. Neutron and X-ray diffraction have been used to determine the stress profiles that exist across the surface of plates welded with low transformation temperature welding alloys, with a particular focus on the stress at the weld toe. For the first time, near surface neutron diffraction data have shown the extent of local stress variation at the critical, fusion boundary location. Compression was evident for the three measurement orientations at the fusion boundaries. Compressive longitudinal residual stresses and tensile transverse stresses were measured in the weld metal.

Item Type: Journal Item
Copyright Holders: 2014 Institute of Materials, Minerals and Mining. Published by Maney on behalf of the Institute
ISSN: 1743-2936
Keywords: martensite; neutron; residual stress; transformation induced plasticity; welding; X-ray diffraction
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 40792
Depositing User: Richard Moat
Date Deposited: 04 Sep 2014 11:18
Last Modified: 15 Sep 2017 11:02
URI: http://oro.open.ac.uk/id/eprint/40792
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