Metallurgy, 𝝁Structure, Rheology – MSR

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    PERMANENT MEMBERS

    Nathalie Bozzolo (head)
    Marc Bernacki (co-head)
    Charbel Moussa
    Cyrille Collin
    Gilbert Fiorucci
    Suzanne Jacomet
    Alexis Nicolaÿ

    Research Field

    Microstructure evolutions of alloys during thermomechanical processing (in the solid state).

    Applications

    - Hot and cold forming, high strains
    - Thermal treatments
    - Recrystallization, grain growth, phase transformations
    - Nickel-based superalloys, titanium alloys, aluminum alloys, steels,…

    Main objectives

    MSR team works on microstructure evolutions induced by thermomechanical processing of metallic materials in the solid state. The research mainly focusses on the :

    • description of active physical mechanisms and their kinetics as a function of thermomechanical parameters at the mesoscopic level,
    • formulation of physical models describing plastic deformation, recrystallization, grain growth, phase transformations and their couplings,
    • implementation of these models in predictive tools for the simulation of microstructural evolutions.

    Originality of the developed approach lies in the combination of skills and complementary tools: experimental physical metallurgy, mechanical metallurgy, modeling and numerical simulation to address/handle cases, which are complex in nature, close to industrial operations. These works are realized through close collaboration between experimental and numerical analyses.
    The MSR team also manages and develops experimental methodologies: thermomechanical tests and heat treatment of metallic materials, metallography and electron microscopy.

    Research areas

    • Development of experimental tools and methods for quantitative microstructure analysis
    • Identification of metallurgical mechanisms and their kinetics
    • Mean field modeling and simulation
    • Full field modeling and simulation
    • Development of numerical methods

    Current Projects

    TOPAZE ANR-SAFRAN INDUSTRIAL CHAIR

    Work program: 8 PhD theses over the period 2020 – 2024.
    Holder: Nathalie Bozzolo, Deputy: P. Villechaise (Pprime institute).
    Objective: Controlling forged microstructures in order to optimize the service life of polycrystalline nickel-based superalloys in new generation aircraft engines and helicopter engines: Focus on 𝛾-𝛾 'alloys.
    In collaboration with Pprime institute to understand/study microstructure-property relationships.
    Co-funded by ANR - Safran.
    Learn more

    DIGI𝝁 ANR INDUSTRIAL CHAIR

    Work program: 6 PhD theses over the period 2016 – 2020.
    Holder: Marc Bernacki, Deputy: Nathalie Bozzolo.
    Objective: Development of software (DIGIMU®) usable in an industrial environment for full field simulation of recrystallization phenomena.
    Co-funded by ANR – ArcelorMittal, Framatome, Ascometal, Aubert&Duval, CEA, Safran.
    With additional participation of Constellium, Timet and Transvalor.
    Learn more

    CONTiNUUM project

    Work program: 6 PhD theses over the period 2019 – 2025.
    Head: Nathalie Bozzolo.
    Objective: Describing microstructure and crystallographic texture evolutions during forging operations and their impact on properties of titanium alloys for aeronautical applications at high temperature.
    In collaboration with Pprime institute and Chimie ParisTech
    Co-funded by Airbus - Safran - Aubert&Duval - Timet.

    OPALE ANR-SAFRAN INDUSTRIAL CHAIR

    Work program: 12 PhD theses and 3 post-docs over the period 2015 – 2020.
    Holder: Nathalie Bozzolo, Deputy: P. Villechaise (Pprime institute).
    Objective: Optimization of polycrystalline nickel-based superalloys properties by controlling the microstructure resulting from forging operations.
    In collaboration with Pprime Institute to study microstructure-property relationships.
    Co-funded by ANR - Safran.
    Learn more

    Equipments

    • Dual beam microscope equipped with EDS and EBSD analysis systems for the analysis of microstructures in three dimensions. This microscope is also equipped with a heat treatment chamber with controlled atmosphere.
    • High spatial resolution scanning electron microscope (FEG) equipped with combined EDS/EBSD analysis.
    • Thermal and thermomechanical treatments up to 1200°C with possibility of water quenching.

    MSR TEAM Highlights :

    Three ANR industrial chairs and one common laboratory

    About thirty ANR industrial chairs in all fields have been selected for funding by the ANR since their creation in 2011. Three of these chairs concern the field of metallurgy and are carried out by the MSR team: OPALE, DIGIMU and TOPAZE, selected from project proposals in 2014, 2016 and 2019 respectively. In 2019, the OPALE common laboratory was also created with Safran.

    Tracking of microstructure evolutions during thermal treatments thanks to a in-situ heating stage

    Orientation maps resulting from EBSD analyses performed after successive thermal treatments on an aluminum alloy. These tests were carried out in the frame of the PhD thesis work of Saoussen OUHIBA, PhD student in the MSR team.

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    3D full field simulation of microstructural evolutions

    Grain growth phenomenon during thermal treatment of a nickel-based superalloy (Inconel 718) in presence of second phase particles. This numerical simulation comes from PhD thesis work of Benjamin Sholtes, former PhD student in the MSR team (2014-2017).

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    My thesis concerns a new nickel-based superalloy developed by VDM Metals. I try to understand and model the recrystallization behavior of the alloy during forging operations.

    Juhi SHARMA, PhD student in the MSR team

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    Academic partners :

    • Carnegie Mellon University - Pittsburgh, USA
    • Chimie ParisTech - Paris, France
    • CINaM - Marseille, France
    • CONICET - Rosario, Argentina
    • EPFL - Neuchâtel, Switzerland
    • Institut Pprime - Poitiers, France
    • Max Plank Institute - Düsseldorf, Germany

    Industrial partners :

    • Airbus
    • ArcelorMittal
    • Ascometal
    • Aubert&Duval
    • CEA
    • Constellium
    • Framatome
    • Timet
    • Safran
    • VDM Metals International

    MSR team keywords :

    Physical, mechanical and numerical metallurgy

    High strains, Complex thermomechanical paths

    Recrystallization, Grain Growth, Precipitation, Phase Transformation

    Experimental analysis, Multi-scale simulation, Level Set method

    Electron microscopy, EBSD

    2D/3D Microstructures

    Superalloys, Titanium Alloys