Gildas Guillemot

Lecturer

Center · CEMEF

Discipline(s): Fluid Mechanics, Solid Mechanics
Topic(s): Additive Manufacturing, Superalloy

Keywords

Awards & distinctions

2023 CALPHAD best paper award

Team

2MS - Métallurgie, Mécanique, Structure et Solidification

Biography

Gildas Guillemot is a researcher specializing in the numerical modeling of additive manufacturing processes and the solidification of metallic materials. His work focuses on the study of multiphysical phenomena involved in laser powder bed fusion (L-PBF), wire laser additive manufacturing (WLAM), and welding processes. His expertise encompasses the simulation of heat transfer, fluid flow, microstructure formation, and residual stresses, incorporating advanced numerical methods such as cellular automata, adaptive finite elements, and level-set approaches. His research aims to better understand the influence of process parameters on weld bead morphology, grain texture, and the metallurgical properties of alloys, particularly nickel-based superalloys such as IN718 and stainless steels. His contributions also include the development of homogenized models for support structures, the analysis of laser-matter interactions at the mesoscopic scale, and the study of dendritic growth kinetics during rapid solidification.

Publication(s)

2025
Multiphysics simulation and microstructure prediction of coaxial wire-laser additive manufacturing process DOI : 10.1016/j.mtla.2025.102461
2025
Homogenization methods for thermal study of support structure in laser powder bed fusion (L-PBF) – application to process numerical modeling DOI : 10.1108/HFF-09-2024-0683
2024
Mesoscale multilayer multitrack modeling of melt pool physics in laser powder bed fusion of lattice metal features DOI : 10.1016/j.addma.2024.104365
2024
Kinetic effects during the plane-front and dendritic solidification of multicomponent alloys DOI : 10.1016/j.actamat.2023.119473
2024
Part-Scale Thermomechanical and Grain Structure Modeling for Additive Manufacturing: Status and Perspectives DOI : 10.3390/met14101173
2023
Three-dimensional modeling of solidification grain structures generated by laser powder bed fusion DOI : 10.1016/j.mtla.2023.101804
2022
Structure and texture simulations in fusion welding processes – comparison with experimental data DOI : 10.1016/j.mtla.2021.101305
2022
The thermodynamics of non-equilibrium interfaces during phase transformations in concentrated multicomponent alloys DOI : 10.1016/j.actamat.2022.118407
2022
Growth competition between columnar dendritic grains – The role of microstructural length scales DOI : 10.1016/j.actamat.2021.117395
2022
Multiphysics simulation of single pulse laser powder bed fusion: comparison of front capturing and front tracking methods DOI : 10.1108/HFF-04-2021-0282
2022
Thermodynamic coupling in the computation of dendrite growth kinetics for multicomponent alloys DOI : 10.1016/j.calphad.2022.102429
2022
Hybrid Cellular Automaton - Parabolic Thick Needle model for equiaxed dendritic solidification DOI : 10.1016/j.jmst.2022.02.017
2021
Effect of processing parameters during the laser beam melting of Inconel 738: Comparison between simulated and experimental melt pool shape DOI : 10.1016/j.jmatprotec.2020.116897
2021
A Partitioned Solution Algorithm for Concurrent Computation of Stress–Strain and Fluid Flow in Continuous Casting Process DOI : 10.1007/s11663-021-02070-4
2021
A review of microstructural changes occurring during FSW in aluminium alloys and their modelling DOI : 10.1016/j.jmatprotec.2020.116706
2021
Morphological stability of spherical particles - Extension of the Mullins-Sekerka criteria to multi-component alloys under a non-stationary diffusive regime DOI : 10.1016/j.actamat.2020.116539
2020
Three-dimensional cellular automaton modeling of silicon crystallization with grains in twin relationships DOI : 10.1016/j.actamat.2020.03.051
2020
3D cellular automaton modelling of silicon crystallization including grains in twin relationship DOI : 10.1088/1757-899X/861/1/012052
2020
Concurrent and coupled resolution of fluid flow and solid deformation in solidification processes DOI : 10.1088/1757-899X/861/1/012068
2020
Numerical study of the impact of vaporisation on melt pool dynamics in Laser Powder Bed Fusion - Application to IN718 and Ti–6Al–4V DOI : 10.1016/j.addma.2020.101249
2020
Impact of solute flow during directional solidification of a Ni-based alloy: In-situ and real-time X-radiography DOI : 10.1016/j.actamat.2020.04.003
2019
Level-set modelling of Laser Beam Melting process applied onto ceramic materials - Comparison with experimental results DOI : 10.1088/1757-899X/529/1/012002
2019
A partitioned two-step solution algorithm for concurrent fluid flow and stress–strain numerical simulation in solidification processes DOI : 10.1016/j.cma.2019.07.006
2019
Thermo-mechanical simulation of track development in the Laser Beam Melting process - Effect of laser-metal interaction DOI : 10.1088/1757-899X/529/1/012005
2019
A partitioned solution algorithm for fluid flow and stress-strain computations applied to continuous casting DOI : 10.1088/1757-899X/529/1/012082
2019
Finite diffusion microsegregation model applied to multicomponent alloys DOI : 10.1088/1757-899X/529/1/012029
2019
Additive manufacturing of an oxide ceramic by laser beam melting—Comparison between finite element simulation and experimental results DOI : 10.1016/j.jmatprotec.2019.02.004
2018
Modeling of eutectic growth kinetics with thermodynamic couplings DOI : 10.1016/j.actamat.2018.08.056
2018
Growth competition between columnar dendritic grains – Cellular automaton versus phase field modeling DOI : 10.1016/j.actamat.2018.05.032
2018
Numerical modelling of fluid and solid thermomechanics in additive manufacturing by powder-bed fusion: Continuum and level set formulation applied to track- and part-scale simulations DOI : 10.1016/j.crme.2018.08.008
2018
Investigation of the Effect of Residual Stress Gradient on the Wear Behavior of PVD Thin Films DOI : 10.1007/s11665-018-3132-1
2018
Numerical modelling of the impact of energy distribution and Marangoni surface tension on track shape in selective laser melting of ceramic material DOI : 10.1016/j.addma.2018.03.003
2018
Macroscopic thermal finite element modeling of additive metal manufacturing by selective laser melting process DOI : 10.1016/j.cma.2017.12.003
2017
Three-dimensional finite element thermomechanical modeling of additive manufacturing by selective laser melting for ceramic materials DOI : 10.1016/j.addma.2017.02.005
2017
An analytical model with interaction between species for growth and dissolution of precipitates DOI : 10.1016/j.actamat.2017.04.035
2017
Columnar and Equiaxed Solidification of Al-7 wt.% Si Alloys in Reduced Gravity in the Framework of the CETSOL Project DOI : 10.1007/s11837-017-2397-4
2017
Erratum: Corrigendum to “Analytical model for equiaxed globular solidification in multicomponent alloys” (Acta Materialia (2015) 97 (419–434)(S1359645415002724)(10.1016/j.actamat.2015.04.030)) DOI : 10.1016/j.actamat.2016.10.017
2016
Three-dimensional cellular automaton-finite element modeling of solidification grain structures for arc-welding processes DOI : 10.1016/j.actamat.2016.05.011
2016
Finite element modeling of deposition of ceramic material during SLM additive manufacturing DOI : 10.1051/matecconf/20168008001
2016
Microstructure modeling
2015
Analytical model for equiaxed globular solidification in multicomponent alloys DOI : 10.1016/j.actamat.2015.04.030
2015
Influence of process-induced microstructure on hardness of two Al-Si alloys DOI : 10.1016/j.msea.2015.08.051
2014
Vickers microhardness of oxidized and nonoxidized porous silicon DOI : 10.1109/NAWDMPV.2014.6997620
2014
A level set approach for the simulation of the multipass hybrid laser/GMA welding process DOI : 10.1016/j.commatsci.2014.04.036
2014
3D coupled cellular automaton (CA)-FINITE ELEment (FE) modeling for solidification grain structures in gas tungsten arc welding (GTAW) DOI : 10.2355/isijinternational.54.401
2014
3D parameter to quantify the anisotropy measurement of periodic structures on rough surfaces DOI : 10.1002/sca.21108
2013
Relevance of Wavelet Shape Selection in a complex signal DOI : 10.1016/j.ymssp.2013.07.001
2013
A coupled Cellular Automaton - Finite Element approach for the modelling of grain structure development in TIG welding; [Développement d'une approche couplée Automates Cellulaires - Eléments Finis pour la modélisation du développement des structures de grains en soudage TIG] DOI : 10.1051/matecconf/20130702002
2013
Direct modeling of structures and segregations up to industrial casting scales DOI : 10.1007/s11837-013-0679-z
2013
A level-set approach for the modelling of hybrid arc/laser welding process application for high thickness steel sheets joining; [Modélisation du procédé de soudage hybride Arc / Laser par une approche level set application aux toles d'aciers de fortes épaisseurs] DOI : 10.1051/matecconf/20130702003
2012
A comparison of models for predicting the true hardness of thin films DOI : 10.1016/j.tsf.2012.10.017
2012
Estimation of the constitutive law by dual small punch test and instrumented indentation DOI : 10.4028/www.scientific.net/SSP.188.193
2011
How to characterize the regularity of surface topographies? DOI : 10.1088/1742-6596/311/1/012012
2011
A generic statistical methodology to predict the maximum pit depth of a localized corrosion process DOI : 10.1016/j.corsci.2011.03.026
2011
Wavelet theory and belt finishing process, influence of wavelet shape on the surface roughness parameter values DOI : 10.1088/1742-6596/311/1/012013
2011
Characterization of innovative steels by dual mechanical tests; [Caractérisation des aciers innovants par essais mécaniques croisés] DOI : 10.1051/mattech/2011034
2011
Characterization of the mechanical properties by nanoindentation of a treatment of diffusion and a coating for the improvement wear resistance of low carbon steels; [Caractérisation des propriétés mécaniques par nanoindentation d'un traitement de diffusion et d'un revêtement pour l'amélioration de la résistance à l'usure des aciers à bas carbone] DOI : 10.1051/meca/2011132
2010
Correlation between thermal properties and aluminum fractions in CrAlN layers deposited by PVD technique DOI : 10.1016/j.vacuum.2010.01.011
2010
On the detection of corrosion pit interactions using two-dimensional spectral analysis DOI : 10.1016/j.corsci.2009.09.011
2010
Elaboration, characterization of CrN- based coatings DOI : 10.1063/1.3552365
2010
A cellular automaton / finite element model for predicting grain texture development in galvanized coatings DOI : 10.1063/1.3552535
2010
Comments on the paper "Modification of composite hardness models to incorporate indentation size effects in thin films", D. Beegan, S. Chowdhury and M.T. Laugier, Thin Solid Films 516 (2008), 3813-3817 DOI : 10.1016/j.tsf.2009.07.178
2009
A multilayer model for describing hardness variations of aged porous silicon low-dielectric-constant thin films DOI : 10.1016/j.tsf.2009.07.040
2009
Feature of solid-liquid metals reaction revealed by conversion electron Mössbauer spectrometry DOI : 10.1007/s10751-009-9918-7
2007
Interaction between single grain solidification and macrosegregation: Application of a cellular automaton-Finite element model DOI : 10.1016/j.jcrysgro.2006.12.076
2006
Modeling of macrosegregation and solidification grain structures with a coupled cellular automaton - Finite element model DOI : 10.2355/isijinternational.46.880
2006
Columnar-to-Equiaxed Transition in SOLidification Processing (CETSOL): A project of the European Space Agency (ESA) - Microgravity Applications Promotion (MAP) programme DOI : 10.4028/0-87849-991-1.393
2006
Interactions between columnar solidification and segregation: A comparison of the predictions of a cafe model with in-situ observations
2004
A new cellular automaton - Finite element coupling scheme for alloy solidification DOI : 10.1088/0965-0393/12/3/013
2004
Modeling of macrosegregation and solidification grain structures with a coupled cellular automaton - Finite element model
2003
Boundary layer correlation for dendrite tip growth with fluid flow DOI : 10.1016/S0921-5093(02)00261-7
1999
Three-dimensional diamond growth film simulations: Correlations between nucleation and surface parameters DOI : 10.1016/s0925-9635(98)00302-1

Teaching

Materials for Engineers

Lecturer

The in-person component (27 hours) is structured into plenary sessions in a lecture hall (12 hours), small-group sessions (12 hours) with smaller class sizes, and presentations of lab reports to a panel (30 minutes). It also includes a written exam (2 hours and 30 minutes). Students’ independent work (18 hours) includes (in addition to the engine disassembly and reassembly mentioned above): A self-assessment multiple-choice quiz (30 min) on prerequisites. This self-assessment is conducted prior to the first class to identify students’ strengths and weaknesses and then focus on certain aspects during face-to-face instruction. An assignment on phase diagrams (2 hours) An assignment on material aging (2 hours) Laboratory work at the CMAT (6 hours): 13 lab sessions are conducted in groups of 4 to 5 students, supervised by the Center’s engineers and technicians as well as doctoral students, since most lab topics are related to current thesis projects. A 20-minute oral presentation for each lab is given at the end of the day in two parallel sessions. Students therefore complete one of the lab sessions and participate in or attend half of the presentations at the end of the day. Two similar days are organized to accommodate the entire class. Final exam review (5 hours)

Metal 3D Printing

Course Director

The curriculum for the course days is as follows: General introduction to additive manufacturing processes; overview of the phenomena involved in LBM and ColdSpray processes; thermodynamics; phase transformation during rapid solidification; associated microstructural evolution; mechanical behavior and properties of parts produced by additive manufacturing processes; post-processing; defect mitigation. LBM and ColdSpray fabrication techniques, construction steps, overview of experimental characterization methodologies related to additive manufacturing processes and defect analysis, measurement of residual stresses using X-ray diffraction (XRD). Numerical modeling of additive manufacturing processes; objectives of simulation tool development; physical phenomena monitored; resolution scales; prediction of final properties. Presentation (by an industry R&D engineer) on the use of additive manufacturing processes in an industrial context, the objectives pursued, and the expected results. In addition to these lectures, a project component will also be included in the course, lasting 6 hours, at the Materials Center (CMAT, Evry), requiring students to travel to this laboratory for two full days. During these two days, on the first morning, students will attend the lecture on fabrication and characterization techniques associated with additive processes (Session V—3 hours in the morning on Day 1). The subsequent training period (3 hours in the afternoon on Day 1 + 3 hours in the morning on Day 2) will be dedicated to carrying out the supervised projects. Independent work (3 hours in the afternoon on Day 2) may be conducted at the CMAT to allow for the review and analysis of the results, in preparation for the evaluation session. Project selections will be made no later than during the first lecture session.

PhD supervision

2025 Mastery of single-crystal part fabrication by LPBF process: modeling of microstructural growth by cellular automaton-finite element coupling on millimetric volumes GAMBLIN Axel
2025 Study of rapid solid-state phase transformations by combining controlled pulse heating experiments and non-equilibrium Calphad interface modeling - RAPID-SOLID ADHAMI Mahmoud
2024 Thermochemistry of covering powders for ingot casting BELAICHA Noura
2023 Analysis of growth competition in microstructures produced during the solidification of metallic alloys HAMMOUD Racha
2023 Modeling of Additive Manufacturing Processes - Application to Low-Loss Magnetic Alloys Produced by 3D Lamination FERRANDEZ Robin
2023 Numerical modeling of precipitation and in-situ heat treatment optimization of the laser powder bed fusion process for aeronautical applications DUCOTTET Sylvain
2022 Laser Wire Additive Manufacturing (WLAM) process: multiphysics numerical simulation of heat transfer, fluid flow, and microstructure formation. Application to IN718 superalloy. KONG Zichen
2021 Multi-scale modeling of rapid solidification and hot cracking in laser powder bed fusion (L-PBF) of nickel-based superalloys MARTIN Paul
2019 Modeling of microstructures generated in additive manufacturing by LPBF process of a nickel-based alloy CAMUS Théophile
2018 Modeling of grain structure and hot cracking in arc welding processes XUE Chengdan
2018 Multi-scale modeling of the Wire Arc Additive Manufacturing (WAAM) process: from the CMT cycle to large-scale parts. RAVIX Lucas
2017 Multi-physics modeling of macrosegregation and freckle formation during the solidification of single-crystal turbine blades. MAGUIN Vincent
2017 Multiphysics numerical simulation of the laser powder bed fusion process - Application to metallic alloys of aeronautical interest QUEVA Alexis
2016 3D modeling of grain structures using a cellular automaton approach. Application to dendritic growth competition and polycrystalline silicon crystallization. PINEAU Adrian
2016 Numerical simulation of mechanical interactions between liquid and solid phases in solidification processes ZHANG Shaojie
2016 Multi-scale numerical modeling of solidification structures, macrosegregation and Columnar-to-Equiaxed Transition ETTROUDI Hanadi
2015 Multi-scale parallelized modeling for predicting dendritic grain structures coupling finite elements, a cellular automaton, and a parabola network FLEURISSON Romain