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Modeling and simulation of weld solidification cracking part II: A model for estimation of grain boundary liquid pressure in a columnar dendritic microstructure
Luleå University of Technology, Luleå, 97187, Sweden.
Luleå University of Technology, Luleå, 97187, Sweden.
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för svetsteknologi (SV). (PTW PRIMUS)ORCID-id: 0000-0001-9065-0741
Luleå University of Technology, Luleå, 97187, Sweden.
2019 (Engelska)Ingår i: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 63, nr 5, s. 1503-1519Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Several advanced alloy systems are susceptible to weld solidification cracking. One example is nickel-based superalloys, which are commonly used in critical applications such as aerospace engines and nuclear power plants. Weld solidification cracking is often expensive to repair, and if not repaired, can lead to catastrophic failure. This study, presented in three papers, presents an approach for simulating weld solidification cracking applicable to large-scale components. The results from finite element simulation of welding are post-processed and combined with models of metallurgy, as well as the behavior of the liquid film between the grain boundaries, in order to estimate the risk of crack initiation. The first paper in this study describes the crack criterion for crack initiation in a grain boundary liquid film. The second paper describes the model for computing the pressure and the thickness of the grain boundary liquid film, which are required to evaluate the crack criterion in paper 1. The third and final paper describes the application of the model to Varestraint tests of Alloy 718. The derived model can fairly well predict crack locations, crack orientations, and crack widths for the Varestraint tests. The importance of liquid permeability and strain localization for the predicted crack susceptibility in Varestraint tests is shown. © 2019, The Author(s).

Ort, förlag, år, upplaga, sidor
2019. Vol. 63, nr 5, s. 1503-1519
Nyckelord [en]
Crack initiation; Grain boundaries; Liquid films; Nickel alloys; Nuclear fuels; Nuclear power plants; Paper; Risk perception; Solidification; Welding; Welds, Alloy 718; Crack susceptibilities; Critical applications; Dendritic microstructure; Finite element simulations; Hot cracking; Nickel- based superalloys; Solidification cracking, Cracks
Nationell ämneskategori
Metallurgi och metalliska material Bearbetnings-, yt- och fogningsteknik
Forskningsämne
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-14461DOI: 10.1007/s40194-019-00761-wISI: 000482459300030Scopus ID: 2-s2.0-85068150806OAI: oai:DiVA.org:hv-14461DiVA, id: diva2:1356405
Forskningsfinansiär
Försvarsmakten, 2013-01140Vinnova, 2017-04837
Anmärkning

Funders:GKN

Tillgänglig från: 2019-10-01 Skapad: 2019-10-01 Senast uppdaterad: 2020-02-03Bibliografiskt granskad

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Andersson, Joel

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Metallurgi och metalliska materialBearbetnings-, yt- och fogningsteknik

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Totalt: 93 träffar
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