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Träfflista för sökning "WFRF:(Moat J.) srt2:(2010-2014)"

Sökning: WFRF:(Moat J.) > (2010-2014)

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  • Ramjaun, T., et al. (författare)
  • Effect of interpass temperature on residual stresses in multipass welds produced using low transformation temperature filler alloy
  • 2014
  • Ingår i: Science and technology of welding and joining. - 1362-1718 .- 1743-2936. ; 19:1, s. 44-51
  • Tidskriftsartikel (refereegranskat)abstract
    • Weld filler alloys that exploit transformation plasticity through low austenite to martensite transformation temperatures offer an effective method of reducing residual stresses in strong steel welds. However, in multipass welds, the heat input from later weld passes may be insufficient to retransform prior welding passes, leading to the accumulation of thermally induced strains and elevated residual stresses. In this work, the residual stress distributions produced around arc welds fabricated with a martensitic weld filler alloy that transforms at a low temperature have been studied as a function of the number of passes deposited and the interpass temperature. It is found that when the interpass temperature is above the transformation temperature of the weld metal, the entire multipass weld transforms as a single entity, thus permitting the optimum exploitation of the transformation plasticity. In contrast, the deposition of new metal with a relatively low interpass temperature leads to increased residual stresses in the underlying layers, reducing or eliminating the beneficial stress states previously created.
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  • Ramjaun, T., et al. (författare)
  • Surface residual stresses in multipass welds produced using low transformation temperature filler alloys
  • 2014
  • Ingår i: Science and technology of welding and joining. - 1362-1718 .- 1743-2936. ; 19:7, s. 623-630
  • Tidskriftsartikel (refereegranskat)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.
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