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Modeling and simulation of weld solidification cracking part III: Simulation of solidification cracking in Varestraint tests of alloy 718
Luleå University of Technology, Luleå, 97187, Sweden.
Luleå University of Technology, Luleå, 97187, Sweden.
University West, Department of Engineering Science, Division of Welding Technology. (PTW PRIMUS)ORCID iD: 0000-0001-9065-0741
Luleå University of Technology, Luleå, 97187, Sweden.
2019 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669Article in journal (Refereed) Epub ahead of print
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 required to compute the pressure and thickness of the liquid film required in the crack criterion. 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).

Place, publisher, year, edition, pages
Springer Verlag , 2019.
Keywords [en]
Crack initiation; Grain boundaries; Liquid films; Nickel alloys; Nuclear fuels; Nuclear power plants; Paper; Risk perception; Solidification; Welding; Welds, Alloy 718; Catastrophic failures; Crack susceptibilities; Critical applications; Finite element simulations; Hot cracking; Nickel- based superalloys; Solidification cracking, Cracks
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-14471DOI: 10.1007/s40194-019-00784-3Scopus ID: 2-s2.0-85071447851OAI: oai:DiVA.org:hv-14471DiVA, id: diva2:1356401
Funder
Swedish Armed Forces, 2013-01140Vinnova, 2017-04837
Note

Funders: FMV; GKN

Available from: 2019-10-01 Created: 2019-10-01 Last updated: 2019-10-02

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Andersson, Joel

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