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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, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0002-7298-020x
University West, Trollhättan, Sweden.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0002-2544-9168
2019 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 63, no 5, p. 1503-1519Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 63, no 5, p. 1503-1519
Keywords [en]
Solidification cracking, Hot cracking, Varestraint testing, Computational welding mechanics, Alloy 718
National Category
Other Materials Engineering
Research subject
Material Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-75653DOI: 10.1007/s40194-019-00761-wISI: 000482459300030Scopus ID: 2-s2.0-85068150806OAI: oai:DiVA.org:ltu-75653DiVA, id: diva2:1344913
Note

Validerad;2019;Nivå 2;2019-08-22 (johcin)

Available from: 2019-08-22 Created: 2019-08-22 Last updated: 2019-09-13Bibliographically approved

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Draxler, JoarEdberg, JonasLindgren, Lars-Erik

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