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Microstructure modelling of laser metal powder directed energy deposition of alloy 718
Univ West, Sweden.
GKN Aerosp Engine Syst AB, Sweden.
Chalmers Univ Technol, Sweden.
Univ West, Sweden.
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2019 (English)In: ADDITIVE MANUFACTURING, ISSN 2214-8604, Vol. 25, p. 357-364Article in journal (Refereed) Published
Abstract [en]

A multi-component and multi-phase-field modelling approach, combined with transformation kinetics modelling, was used to model microstructure evolution during laser metal powder directed energy deposition of Alloy 718 and subsequent heat treatments. Experimental temperature measurements were utilised to predict microstructural evolution during successive addition of layers. Segregation of alloying elements as well as formation of Laves and delta phase was specifically modelled. The predicted elemental concentrations were then used in transformation kinetics to estimate changes in Continuous Cooling Transformation (CCT) and Time Temperature Transformation (TTT) diagrams for Alloy 718. Modelling results showed good agreement with experimentally observed phase evolution within the microstructure. The results indicate that the approach can be a valuable tool, both for improving process understanding and for process development including subsequent heat treatment.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 25, p. 357-364
Keywords [en]
Phase-field; DED; Heat treatment; Thermal cycle; Modelling
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-154722DOI: 10.1016/j.addma.2018.11.024ISI: 000456378800034OAI: oai:DiVA.org:liu-154722DiVA, id: diva2:1292264
Note

Funding Agencies|European Regional Development Fund; KK Foundation (Stiftelsen for Kunskaps- och Kompetensutveckling)

Available from: 2019-02-27 Created: 2019-02-27 Last updated: 2019-03-15

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CiteExportLink to record
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Citation style
  • apa
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