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Modelling microstructure evolution of weld deposited Ti-6Al-4V
University West, Department of Engineering Science, Division of Production Engineering.ORCID iD: 0000-0002-3687-7782
2008 (English)Licentiate thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology , 2008. , p. 59p. 59-s.
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 2008:47
Keywords [en]
metal deposition, Ti-6Al-4V, microstructure modelling, titanium alloy, Finite Element Method, Johnson-Mehl-Avrami, RTMwD
National Category
Materials Engineering
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-2406OAI: oai:DiVA.org:hv-2406DiVA, id: diva2:315373
Presentation
(English)
Note
Corinne Charles ill. S. 1-28: sammanfattning, s. 31-59: 3 uppsatserAvailable from: 2010-04-29 Created: 2010-04-29 Last updated: 2016-05-13Bibliographically approved
List of papers
1. Development of a Microstructure Model for Metal Deposition of Titanium Alloy Ti-6Al-4V
Open this publication in new window or tab >>Development of a Microstructure Model for Metal Deposition of Titanium Alloy Ti-6Al-4V
2007 (English)In: Ti-2007 : science and technology : proceedings of the 11th World Conference on Titanium (JIMIC 5): held at Kyoto International Conference Center, Kyoto, Japan, 3 - 7 June 2007, 2007, p. 1201-1205Conference paper, Published paper (Refereed)
National Category
Metallurgy and Metallic Materials Materials Engineering
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-193 (URN)978-4-88903-406-6 (ISBN)
Available from: 2009-04-22 Created: 2009-04-22 Last updated: 2016-05-13Bibliographically approved
2. Finite Element Modelling of Microstructure on GTAW Metal Deposition of Ti-6Al-4V alloy
Open this publication in new window or tab >>Finite Element Modelling of Microstructure on GTAW Metal Deposition of Ti-6Al-4V alloy
2006 (English)In: Computer Technology in Welding and Manufacturing : 16th International Conference & Mathematical Modelling and Information Technologies in Welding and Related Processes: Kiev, Ukraine, June 6-8, 2006Conference paper, Published paper (Other academic)
National Category
Materials Engineering
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-1879 (URN)9668872053 (ISBN)9789668872051 (ISBN)
Available from: 2009-11-04 Created: 2009-11-04 Last updated: 2016-05-13Bibliographically approved
3. Modelling Ti-6Al-4V microstructure by evolution laws implemented as finite element subroutines:: Application to TIG metal deposition
Open this publication in new window or tab >>Modelling Ti-6Al-4V microstructure by evolution laws implemented as finite element subroutines:: Application to TIG metal deposition
2008 (English)In: 8 th International Conference on Trends in welding research,: Pine Mountain, Georgia, June 2-6, 2008Conference paper, Published paper (Other academic)
National Category
Metallurgy and Metallic Materials
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-2064 (URN)
Available from: 2009-12-17 Created: 2009-12-17 Last updated: 2016-05-13Bibliographically approved

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Charles, Corinne

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