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A numerical model for simulating the effect of strain rate on eutectic band thickness
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för svetsteknologi (SV). (PTW)ORCID-id: 0000-0002-2197-6243
Lulea University of Technology, 97187 Luleå, Sweden.
Lulea University of Technology, 97187 Luleå, Sweden.
Lulea University of Technology, 97187 Luleå, Sweden.
Vise andre og tillknytning
2020 (engelsk)Inngår i: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 64, s. 1635-1658Artikkel i tidsskrift (Fagfellevurdert) Published
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).

sted, utgiver, år, opplag, sider
2020. Vol. 64, s. 1635-1658
Emneord [en]
Eutectics; Grain boundaries; Heat affected zone; Liquid films; Solidification; Tensile strain, Alloy 718; Effect of strain; Hot cracks; Liquation cracking; Partially melted zone; Solidification modeling; Solidification rate; Weld metal, Strain rate
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Identifikatorer
URN: urn:nbn:se:hv:diva-15741DOI: 10.1007/s40194-020-00918-yISI: 000540687300001Scopus ID: 2-s2.0-85086930636OAI: oai:DiVA.org:hv-15741DiVA, id: diva2:1460905
Forskningsfinansiär
Vinnova, 2017-04837Tilgjengelig fra: 2020-08-25 Laget: 2020-08-25 Sist oppdatert: 2021-01-27bibliografisk kontrollert

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