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Charles Murgau, CorinneORCID iD iconorcid.org/0000-0002-3687-7782
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Publications (10 of 11) Show all publications
Charles Murgau, C., Lundbäck, A., Åkerfeldt, P. & Pederson, R. (2019). Temperature and microstructure evolution in Gas Tungsten Arc Welding wire feed additive manufacturing of Ti-6Al-4V. Materials, 12(21), Article ID E3534.
Open this publication in new window or tab >>Temperature and microstructure evolution in Gas Tungsten Arc Welding wire feed additive manufacturing of Ti-6Al-4V
2019 (English)In: Materials, ISSN 1996-1944, Vol. 12, no 21, article id E3534Article in journal (Refereed) Published
Abstract [en]

The Finite Element Method (FEM) is used to solve temperature field and microstructure evolution during GTAW wire feed additive manufacturing process.The microstructure of titanium alloy Ti-6Al-4V is computed based on the temperature evolution in a point-wise logic. The methodology concerning the microstructural modeling is presented. A model to predict the thickness of the Į lath morphology is also implemented. The results from simulations are presented togethe rwith qualitative and quantitative microstructure analysis.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
Additive manufacturing, Titanium, Ti-6Al-4V, modeling, metal deposition, Finite Element
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
urn:nbn:se:hv:diva-9344 (URN)10.3390/ma12213534 (DOI)2-s2.0-85074651225 (Scopus ID)
Note

Ingår i avhandling

Available from: 2016-05-13 Created: 2016-05-13 Last updated: 2019-11-25Bibliographically approved
Charles Murgau, C. (2016). Microstructure model for Ti-6Al-4V used in simulation of additive manufacturing. (Doctoral dissertation). Luleå: Luleå tekniska universitet
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. p. 159
Series
Doctoral thesis / Luleå University of Technology, ISSN 1402-1544
Keywords
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; ENGINEERING, Manufacturing and materials engineering
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: 2019-12-04Bibliographically approved
Charles Murgau, C., Pederson, R. & Lindgren, L. E. (2012). A model for Ti-6Al-4V microstructure evolution for arbitrary temperature changes. Modelling and Simulation in Materials Science and Engineering, 20(5), 055006
Open this publication in new window or tab >>A model for Ti-6Al-4V microstructure evolution for arbitrary temperature changes
2012 (English)In: Modelling and Simulation in Materials Science and Engineering, ISSN 0965-0393, E-ISSN 1361-651X, Vol. 20, no 5, p. 055006-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.

Keywords
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:nbn:se:hv:diva-4526 (URN)10.1088/0965-0393/20/5/055006 (DOI)000305805200006 ()2-s2.0-84862730510 (Scopus ID)
Available from: 2012-08-02 Created: 2012-08-02 Last updated: 2017-12-07Bibliographically approved
Lindgren, L.-E., Babu, B., Charles, C. & Wedberg, D. (2010). Simulation of manufacturing chains and use of coupled microstructure and constitutive models. In: Aktar S Khan, Babak Farrokh, (Ed.), Finite Plasticity and Visco-plasticity of Conventional and Emerging Materials: . Paper presented at International Symposium on Plasticity 2010 and its current applications. St Kitts, Saint Kitts and Nevis (pp. 4 s.). Fulton, Maryland, USA,: NEAT PRESS
Open this publication in new window or tab >>Simulation of manufacturing chains and use of coupled microstructure and constitutive models
2010 (English)In: Finite Plasticity and Visco-plasticity of Conventional and Emerging Materials / [ed] Aktar S Khan, Babak Farrokh,, Fulton, Maryland, USA,: NEAT PRESS , 2010, p. 4 s.-Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Fulton, Maryland, USA,: NEAT PRESS, 2010
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-2404 (URN)0-9659463-2-0 (ISBN)
Conference
International Symposium on Plasticity 2010 and its current applications. St Kitts, Saint Kitts and Nevis
Note

Utgiven på CD-ROM

Available from: 2010-04-29 Created: 2010-04-29 Last updated: 2019-11-21Bibliographically approved
Edstorp, M. & Charles, C. (2009). A Finite Element Methodology for Simulating the Influence of Process Parameters on the Phase Transitions in a GTA weld. In: Proceedings of the 15th International Conference on the Joining of Materials: . Paper presented at 15th International Conference on the Joining of Materials.
Open this publication in new window or tab >>A Finite Element Methodology for Simulating the Influence of Process Parameters on the Phase Transitions in a GTA weld
2009 (English)In: Proceedings of the 15th International Conference on the Joining of Materials, 2009Conference paper, Published paper (Other academic)
National Category
Manufacturing, Surface and Joining Technology Production Engineering, Human Work Science and Ergonomics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-2394 (URN)
Conference
15th International Conference on the Joining of Materials
Available from: 2010-04-28 Created: 2010-04-28 Last updated: 2019-11-18Bibliographically approved
Charles, C. (2008). Modelling microstructure evolution of weld deposited Ti-6Al-4V. (Licentiate dissertation). Luleå: Luleå University of Technology
Open this publication in new window or tab >>Modelling microstructure evolution of weld deposited Ti-6Al-4V
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. 59
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 2008:47
Keywords
metal deposition, Ti-6Al-4V, microstructure modelling, titanium alloy, Finite Element Method, Johnson-Mehl-Avrami, RTMwD
National Category
Other Materials Engineering
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-2406 (URN)
Presentation
(English)
Note

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

Available from: 2010-04-29 Created: 2010-04-29 Last updated: 2019-11-19Bibliographically approved
Charles, C. & Järvstråt, N. (2008). Modelling Ti-6Al-4V microstructure by evolution laws implemented as finite element subroutines:: Application to TIG metal deposition. In: 8 th International Conference on Trends in welding research,: Pine Mountain, Georgia, June 2-6.
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
Charles, C. & Järvstråt, N. (2007). Development of a Microstructure Model for Metal Deposition of Titanium Alloy Ti-6Al-4V. 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. Paper presented at 11th World Conference on Titanium (JIMIC 5), Kyoto, Japan, 3 - 7 June 2007 (pp. 1201-1205).
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 Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-193 (URN)978-4-88903-406-6 (ISBN)
Conference
11th World Conference on Titanium (JIMIC 5), Kyoto, Japan, 3 - 7 June 2007
Available from: 2009-04-22 Created: 2009-04-22 Last updated: 2019-11-19Bibliographically approved
Charles, C. (2007). Modelling Microstructure Evolution in Weld Deposited Titanium. In: NAFEMS Contact Nordic Countries, 2007, NAFEMS Nordic seminar; 4 (Oslo): 2007.03.20-21: . Paper presented at The 4th NAFEMS Nordic Seminar: MATERIALS MODELING - FEA Simulations of the Behavior of Modern Industrial Materials Including their Failure, Oslo (Sandvika), Norway.
Open this publication in new window or tab >>Modelling Microstructure Evolution in Weld Deposited Titanium
2007 (English)In: NAFEMS Contact Nordic Countries, 2007, NAFEMS Nordic seminar; 4 (Oslo): 2007.03.20-21, 2007Conference paper, Published paper (Other academic)
National Category
Metallurgy and Metallic Materials Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-194 (URN)
Conference
The 4th NAFEMS Nordic Seminar: MATERIALS MODELING - FEA Simulations of the Behavior of Modern Industrial Materials Including their Failure, Oslo (Sandvika), Norway
Available from: 2009-04-22 Created: 2009-04-22 Last updated: 2019-11-19Bibliographically approved
Charles, C. & Järvstråt, N. (2006). Finite Element Modelling of Microstructure on GTAW Metal Deposition of Ti-6Al-4V alloy. 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. Paper presented at 16th International Conference & Mathematical Modelling and Information Technologies in Welding and Related Processes.
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
Other Materials Engineering Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
urn:nbn:se:hv:diva-1879 (URN)9668872053 (ISBN)9789668872051 (ISBN)
Conference
16th International Conference & Mathematical Modelling and Information Technologies in Welding and Related Processes
Available from: 2009-11-04 Created: 2009-11-04 Last updated: 2019-11-18Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-3687-7782

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