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Thermal simulation and phase modeling of bulk metallic glass in the powder bed fusion process
Lulea Univ Technol, S-97187 Lulea, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0001-8500-1632
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0002-6486-5156
Lulea Univ Technol, S-97187 Lulea, Sweden.
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2019 (English)In: ADDITIVE MANUFACTURING, ISSN 2214-8604, Vol. 27, p. 345-352Article in journal (Refereed) Published
Abstract [en]

One of the major challenges with the powder bed fusion process (PBF) and formation of bulk metallic glass (BMG) is the development of process parameters for a stable process and a defect-free component. The focus of this study is to predict formation of a crystalline phase in the glass forming alloy AMZ4 during PBF. The approach combines a thermal finite element model for prediction of the temperature field and a phase model for prediction of crystallization and devitrification. The challenge to simulate the complexity of the heat source has been addressed by utilizing temporal reduction in a layer-by-layer fashion by a simplified heat source model. The heat source model considers the laser power, penetration depth and hatch spacing and is represented by a volumetric heat density equation in one dimension. The phase model is developed and calibrated to DSC measurements at varying heating rates. It can predict the formation of crystalline phase during the non-isothermal process. Results indicate that a critical location for devitrification is located a few layers beneath the top surface. The peak is four layers down where the crystalline volume fraction reaches 4.8% when 50 layers are built.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 27, p. 345-352
Keywords [en]
Additive manufacturing simulation, Heat input modeling, Phase evolution, BMG, PBF
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-387966DOI: 10.1016/j.addma.2019.03.011ISI: 000466995800034OAI: oai:DiVA.org:uu-387966DiVA, id: diva2:1331865
Funder
Swedish Foundation for Strategic Research , GMT14-0048Available from: 2019-06-27 Created: 2019-06-27 Last updated: 2019-06-27Bibliographically approved

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Pacheco, VictorSahlberg, Martin

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