Unpublished conference/Abstract (Scientific congresses and symposiums)
Predicted microstructure in repair technology of Ti-6Al-4V
Tran, Hoang Son; Tchuindjang, Jérôme Tchoufack; Paydas, Hakan et al.
201816th edition of the European Mechanics of Material Conference
Peer reviewed
 

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Keywords :
Additive Manufacturing; FE simulation; Laser cladding; Ti6Al4V; Repair
Abstract :
[en] Laser cladding is a metal deposition technique often used to repair components [1]. Solidification following melting and partial remelting of pre-existing layers is coupled with heat treatment of the solidified material due to the repeated heating and cooling cycles during building. The effect of the building strategy on the metallurgical characteristics of the material for a decreasing track length (DTL) or a constant track length (CTL) strategy is analysed.Optical Microscopy (OM), Stereo Microscopy (SM), and Scanning Electron Microscopy (SEM) were used in order to study the microstructure. The generation of the microstructure results from the material thermal history. The updated Lagrangian FE code Lagamine developed by ArGEnCo Department of the University of Liège to model forming processes is applied here on the laser cladding process [2]. The 3D-mesh is refined in the deposit and the top of the substrate in order to accurately model heat fluxes while the bottom of the substrate is meshed as coarse as possible. To generate an optimal mesh, transition refinement elements were used. In this powder injection technique, the continuous addition of material on the substrate is modelled by the element birth technique also called “switch” within Lagamine code. The predicted thermal field is found close from the measurements of type-K thermocouples introduced inside the substrate. Such results were computed for both building strategies: decreasing track length (DTL) and constant track length (CTL) strategy. The predicted temperature histories confirm that a more uniform temperature history is applied to the deposit by the CTL choice than the DTL one. The presence in DTL case of heterogeneity within the hardness measurements and the phases observed by metallography [1] can be explained by the computed temperature distributions. A detailed analysis linking microstructure and thermal history is provided. [1] Paydas H., Mertens A., Carrus R., Lecomte-Beckers J., Tchuindjang J.T., Laser cladding as repair, technology for Ti–6Al–4V alloy: Influence of building strategy on microstructure and hardness Materials & Design 85, 2015, 497-510. [2] Tran H.S., Tchuindjang J.T., Paydas H., Mertens A., Jardin R.T., Duchene L., Carrus R., Lecomte-Beckers J. and Habraken A., 2017, “3D thermal finite element analysis of laser cladding processed Ti-6Al-4V part with microstructural correlations” Mater. Des. 128, 130.
Disciplines :
Materials science & engineering
Author, co-author :
Tran, Hoang Son ;  Université de Liège - ULiège > Département ArGEnCo > Département Argenco : Secteur MS2F
Tchuindjang, Jérôme Tchoufack  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Paydas, Hakan ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Tomé Jardin, Ruben Antonio ;  Université de Liège - ULiège > Département ArGEnCo > Département Argenco : Secteur MS2F
Carrus, Raoul
Mertens, Anne  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques
Habraken, Anne  ;  Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
Language :
English
Title :
Predicted microstructure in repair technology of Ti-6Al-4V
Alternative titles :
[fr] Prédiction de la microstructure dans la technologie de réparation des pièces en TA6V
Publication date :
28 March 2018
Event name :
16th edition of the European Mechanics of Material Conference
Event organizer :
European Mechanics society
Event place :
Nantes, France
Event date :
26-28 March 2018
Audience :
International
Peer reviewed :
Peer reviewed
Available on ORBi :
since 13 May 2018

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