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A model for Ti-6Al-4V microstructure evolution for arbitrary temperature changes
University West, Department of Engineering Science, Division of Production Engineering. (PTw)ORCID iD: 0000-0002-3687-7782
Luleå University of Technology, Division of Material Science.
Luleå University of Technology, Division of Material Mechanics.
2012 (English)In: Modelling and Simulation in Materials Science and Engineering, ISSN 0965-0393, E-ISSN 1361-651X, Vol. 20, no 5, 055006- p.Article in journal (Refereed) Published
Abstract [en]

This paper presents a microstructure model for the titanium alloy Ti-6Al-4V designed to be used in coupled thermo-metallurgical-mechanical simulations of, e.g., welding processes. The microstructure evolution is increasingly taken into consideration in analyses of manufacturing processes since it directly affects the mechanical properties. Thermally driven phase evolutions are accounted for in the model. A state variable approach is adopted to represent the microstructure with the objective to integrate the microstructure changes with a thermomechanical model of manufacturing process simulation such as welding. The model is calibrated using the literature data and also validated against a cyclic temperature history during multi-pass welding.

Place, publisher, year, edition, pages
2012. Vol. 20, no 5, 055006- p.
Keyword [en]
alpha+beta titanium-alloys, phase-transformation, beta-phase, kinetics, steels, martensite, austenite, decomposition, simulations, growth
National Category
Robotics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-4526DOI: 10.1088/0965-0393/20/5/055006ISI: 000305805200006Scopus ID: 2-s2.0-84862730510OAI: oai:DiVA.org:hv-4526DiVA: diva2:542597
Available from: 2012-08-02 Created: 2012-08-02 Last updated: 2016-05-13Bibliographically approved
In thesis
1. Microstructure model for Ti-6Al-4V used in simulation of additive manufacturing
Open this publication in new window or tab >>Microstructure model for Ti-6Al-4V used in simulation of additive manufacturing
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is devoted to microstructure modelling of Ti-6Al-4V. The microstructure and the mechanical properties of titanium alloys are highly dependent on the temperature history experienced by the material. The developed microstructure model accounts for thermaldriving forces and is applicable for general temperature histories. It has been applied to study wire feed additive manufacturing processes that induce repetitive heating and cooling cycles.The microstructure model adopts internal state variables to represent the microstructure through microstructure constituents' fractions in finite element simulation. This makes it possible to apply the model efficiently for large computational models of general thermomechanical processes. The model is calibrated and validated versus literature data. It is applied to Gas Tungsten Arc Welding -also known as Tungsten Inert Gas welding-wire feed additive manufacturing process.Four quantities are calculated in the model: the volume fraction of phase, consisting of Widmanstätten, grain boundary, and martensite. The phase transformations during cooling are modelled based on diffusional theory described by a Johnson-Mehl-Avrami-Kolmogorov formulation, except for diffusionless martensite formation where the Koistinen-Marburger equation is used. A parabolic growth rate equation is used for the to transformation upon heating. An added variable, structure size indicator of Widmanstätten, has also been implemented and calibrated. It is written in a simple Arrhenius format.The microstructure model is applied to in finite element simulation of wire feed additive manufacturing. Finally, coupling with a physically based constitutive model enables a comprehensive and predictive model of the properties that evolve during processing.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2016. 159 p.
Series
Doctoral thesis / Luleå University of Technology, ISSN 1402-1544
Keyword
Titanium alloy, Ti-6Al-4V, Welding, Metal deposition, Additive manufacturing, Wire feed, Finite Element Method, Microstructure model, Johnson-Mehl-Avrami- Kolmogorov, Thermally driven
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
urn:nbn:se:hv:diva-9346 (URN)978-91-7583-579-2 (ISBN)978-91-7583-580-8 (ISBN)
Public defence
2016-05-24, E246, Luleå tekniska universitet, Luleå, 09:30 (English)
Opponent
Supervisors
Available from: 2016-05-13 Created: 2016-05-13 Last updated: 2016-05-13Bibliographically approved

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