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Effects of dilution and baseplate strength on stress distributions in multipass welds deposited using low transformation temperature filler alloys
University of Cambridge.
Unversity of Cambridge.
University West, Department of Engineering Science, Research Enviroment Production Technology West. (PTW, Welding technology)ORCID iD: 0000-0001-8822-2705
ISIS Facility, Rutherford Appleton Laboratory.
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2014 (English)In: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, ISSN 1362-1718, Vol. 19, no 6, 461-467 p.Article in journal (Refereed) Published
Abstract [en]

Transformation plasticity can be utilised to control residual stresses in steel welds. This requires special filler alloys that transform at a sufficiently low temperature to compensate for accumulated thermal contraction strains. However, the welding parameters needed to optimise the effect in multipass joints have yet to be established. This topic has been investigated by characterising the residual stress distribution in multipass welds fabricated with different welding alloys and baseplates using neutron diffraction to assess the effects of dilution and baseplate strength. While the use of richly alloyed weld metal does enhance fatigue performance in single pass joints, the extent of stress relief that can be derived from transformation plasticity is reduced due to incomplete martensitic transformation when further layers are deposited. For all cases studied, compressive stresses were measured in the weld metal with balancing tensile stress in the heat affected zone of the plate. The magnitude of the tension was observed to be a function of the strength of the baseplate. Recommendations are also presented for the combination of welding and material parameters that lead to the optimum exploitation of transformation plasticity as a method for boosting the fatigue performance of multipass welded joints.

Place, publisher, year, edition, pages
Maney Publishing, 2014. Vol. 19, no 6, 461-467 p.
Keyword [en]
Martensitic weld metal; Residual stress; Transformation induced plasticity; Welding phase transformation
National Category
Metallurgy and Metallic Materials Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-6604DOI: 10.1179/1362171814Y.0000000209ISI: 000346152100002Scopus ID: 2-s2.0-84902967503OAI: oai:DiVA.org:hv-6604DiVA: diva2:744991
Available from: 2014-09-09 Created: 2014-09-09 Last updated: 2017-12-05Bibliographically approved

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Karlsson, Leif

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