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  • 1.
    Draxler, Joar
    et al.
    University West, Department of Engineering Science, Division of Welding Technology.
    Åkerström, P.
    Lulea University of Technology, 97187 Luleå, Sweden.
    Edberg, J.
    Lulea University of Technology, 97187 Luleå, Sweden.
    Lindgren, L. -E
    Lulea University of Technology, 97187 Luleå, Sweden.
    Singh, S.
    Chalmers University of Technology, 41296 Goteborg, Sweden .
    Raza, Tahira
    University West, Department of Engineering Science, Division of Welding Technology.
    Andersson, Joel
    University West, Department of Engineering Science, Division of Welding Technology.
    A numerical model for simulating the effect of strain rate on eutectic band thickness2020In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 64, p. 1635-1658Article in journal (Refereed)
    Abstract [en]

    Large tensile strains acting on the solidifying weld metal can cause the formation of eutectic bands along grain boundaries. These eutectic bands can lead to severe liquation in the partially melted zone of a subsequent overlapping weld. This can increase the risk of heat-affected zone liquation cracking. In this paper, we present a solidification model for modeling eutectic bands. The model is based on solute convection in grain boundary liquid films induced by tensile strains. The proposed model was used to study the influence of strain rate on the thickness of eutectic bands in Alloy 718. It was found that when the magnitude of the strain rate is 10 times larger than that of the solidification rate, the calculated eutectic band thickness is about 200 to 500% larger (depending on the solidification rate) as compared to when the strain rate is zero. In the paper, we also discuss how eutectic bands may form from hot cracks. © 2020, The Author(s).

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