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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.
Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW). (PTW, Welding technology)ORCID-id: 0000-0001-8822-2705
ISIS Facility, Rutherford Appleton Laboratory.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, Vol. 19, nr 6, s. 461-467Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2014. Vol. 19, nr 6, s. 461-467
Emneord [en]
Martensitic weld metal; Residual stress; Transformation induced plasticity; Welding phase transformation
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-6604DOI: 10.1179/1362171814Y.0000000209ISI: 000346152100002Scopus ID: 2-s2.0-84902967503OAI: oai:DiVA.org:hv-6604DiVA, id: diva2:744991
Tilgjengelig fra: 2014-09-09 Laget: 2014-09-09 Sist oppdatert: 2019-05-10bibliografisk kontrollert

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