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Microstructure model for Ti-6Al-4V used in simulation of additive manufacturing

Charles Murgau, Corinne (författare)
Luleå tekniska universitet,Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW,Material- och solidmekanik
Lindgren, Lars-Erik (preses)
Mechanics of Sold Materials, Luleå University of Technology, SE-971 87, Luleå, Sweden
Järvstråt, Niklas (preses)
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Pederson, Robert (preses)
GKN Aerospace Engine Systems, 461 81 Trollhättan, Sweden
Sjöström, Sören (opponent)
Avd SOLMEK, Institutionen för EI, Linköpings universitet, Linköping
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 (creator_code:org_t)
ISBN 9789175835792
Luleå : Luleå tekniska universitet, 2016
Engelska 159 s.
Serie: Doctoral thesis / Luleå University of Technology, 1402-1544
Serie: Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, 1402-1544
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)
Abstract Ämnesord
Stäng  
  • 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.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Annan materialteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Other Materials Engineering (hsv//eng)

Nyckelord

Titanium alloy
Ti-6Al-4V
Welding
Metal deposition
Additive manufacturing
Wire feed
Finite Element Method
Microstructure model
Johnson-Mehl-Avrami- Kolmogorov
Thermally driven
Production Technology
Produktionsteknik
Manufacturing and materials engineering
Produktions- och materialteknik
Material Mechanics

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