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Finite Element Modelling of Microstructure on GTAW Metal Deposition of Ti-6Al-4V alloy
Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för maskinteknik.ORCID-id: 0000-0002-3687-7782
Högskolan Väst, Institutionen för teknik, matematik och datavetenskap, Avd för maskinteknik.
2006 (engelsk)Inngår i: Computer Technology in Welding and Manufacturing : 16th International Conference & Mathematical Modelling and Information Technologies in Welding and Related Processes: Kiev, Ukraine, June 6-8, 2006Konferansepaper, Publicerat paper (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
2006.
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-1879ISBN: 9668872053 (tryckt)ISBN: 9789668872051 (tryckt)OAI: oai:DiVA.org:hv-1879DiVA, id: diva2:275197
Konferanse
16th International Conference & Mathematical Modelling and Information Technologies in Welding and Related Processes
Tilgjengelig fra: 2009-11-04 Laget: 2009-11-04 Sist oppdatert: 2020-04-01bibliografisk kontrollert
Inngår i avhandling
1. Modelling microstructure evolution of weld deposited Ti-6Al-4V
Åpne denne publikasjonen i ny fane eller vindu >>Modelling microstructure evolution of weld deposited Ti-6Al-4V
2008 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The microstructure and consequently the mechanical properties of titanium alloys are highly dependent on the temperature history endured by the material. The manufacturing process of metal deposition induces repetitive cooling and heating in the material determining a specific microstructure. The presented study is devoted to developing and implementing a microstructure model for Ti-6Al-4V intended to be coupled to a thermo- mechanical model of the metal deposition process.

Microstructural analysis of the metal deposited samples was first performed to understand the formed microstructure. A set of representative parameters for microstructure modelling were then selected as representative for the known impact of Ti-6Al-4V microstructure on mechanical properties. Evolution equations for these parameters were implemented for thermal finite element analysis of the process. Six representative state variables are modelled: the phase volume fraction of total alpha, beta, Widmanstätten alpha, grain boundary alpha, martensite alpha, and the alpha lath thickness. Heating, cooling and repeated re-heating involved in the process of metal deposition are taken into account in the model. The phase transformations were modelled based on a diffusionnal theory described by a Johnson-Mehl-Avrami formulation, as well as diffusionless transformations for the martensite alpha formation and the beta reformation during reheating. The Arrhenius equation is applied as a simplification to model temperature dependent alpha lath size calculation. Grain growth is not included in the present formulation, but would have to be added for capturing alpha lath coarsening during long term heat treatment.

The temperature history during robotised tungsten inert gas deposition welding is simulated together with the microstructure. The implementation of the model handles well the complex cyclic thermal loading from the metal deposition process. A particular banded structure observed in the metal deposited microstructure is partially explained using the proposed microstructure model. It is concluded that although qualitatively interesting results have been achieved, further calibration testing over a wider range of temperature histories must be performed to improve the transformation kinetic parameters for reliable quantitative predictions of the microstructure.

sted, utgiver, år, opplag, sider
Luleå: Luleå University of Technology, 2008. s. 59
Serie
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 2008:47
Emneord
metal deposition, Ti-6Al-4V, microstructure modelling, titanium alloy, Finite Element Method, Johnson-Mehl-Avrami, RTMwD
HSV kategori
Forskningsprogram
TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-2406 (URN)
Presentation
(engelsk)
Merknad

Corinne Charles ill. S. 1-28: sammanfattning, s. 31-59: 3 uppsatser

Tilgjengelig fra: 2010-04-29 Laget: 2010-04-29 Sist oppdatert: 2019-11-19bibliografisk kontrollert

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Charles, CorinneJärvstråt, Niklas

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