A5026680888- High Temperature Alloys and Creep
- High-Temperature Coating Behaviors
- Additive Manufacturing Materials and Processes
- Metallurgy and Material Science
- Intermetallics and Advanced Alloy Properties
- Metallurgy and Material Forming
- Microstructure and Mechanical Properties of Steels
- Advanced Materials Characterization Techniques
- Microstructure and mechanical properties
- High Entropy Alloys Studies
- Aluminum Alloy Microstructure Properties
- Fatigue and fracture mechanics
- Nuclear Materials and Properties
- Additive Manufacturing and 3D Printing Technologies
- Powder Metallurgy Techniques and Materials
- Metallurgical Processes and Thermodynamics
- Mechanical and Thermal Properties Analysis
- Machine Learning in Materials Science
- Metal Alloys Wear and Properties
- nanoparticles nucleation surface interactions
- Manufacturing Process and Optimization
- Injection Molding Process and Properties
Université Paris-Saclay
2017-2024
Office National d'Études et de Recherches Aérospatiales
2014-2024
Science et Ingénierie des Matériaux et Procédés
2007-2010
The weak-beam technique of transmission electron microscopy has been used to analyse a new shearing configuration γ′ precipitates after creep at 700°C Ni-based superalloy for gas turbine discs. configurations are made up superlattice extrinsic stacking faults, matrix faults and individual (a/6)⟨112⟩ Shockley dislocations. This mechanism is initiated by the decorrelated movement two partials single (a/2)⟨110⟩ dislocation. propagation leading partial creates this process. phenomenon that...
Second phase particles (SPP) play an essential role in controlling grain size and properties of polycrystalline nickel base superalloys. The understanding the behavior these precipitates is prime importance predicting microstructure evolutions. dissolution kinetics primary γ′ during subsolvus solution treatments were investigated for three superalloys (René 65, AD730 N19). A temperature-time codependency equation was established to describe evolution each material using experimental data,...
The creep behaviour of the PM NR3 nickel-based superalloy has been studied at 700°C in a wide stress range as function its microstructure.It was first confirmed that this critical temperature coarse-grained microstructure preferable to fine-grained one obtain highest resistance.The role tertiary γ ′ phase precipitates coarsegrained investigated two levels typical both low and high regimes.Careful identification dislocation mechanisms by transmission electron microscopy performed strained...
Grain boundary and intragranular deformations have been analysed during high temperature creep of a PM nickel-based superalloy.Local deformation has quantified using an original microextensometry technique.This technique consists in calculating ceramic square grids deposited on flat specimens thanks to electron lithography technique.Grain sliding (GBS) was by measuring microgrid offsets at grain boundaries.Strain maps GBS computed.Superimposition with back scattered diffraction (EBSD)...
Microstructures of the new PM superalloy N19 have been investigated for various heat treatments in order to reach best compromise between static strength and cyclic resistance. One subsolvus several supersolvus were applied produce fine (7 μm) medium (25 grain sizes, respectively. The alloy is shown be quite sensitive cooling conditions after solutioning as γ′ hardening precipitates, both secondary tertiary, a direct influence on mechanical properties. Two high crack propagation resistance...
The N18 superalloy, powder metallurgy processed, is used for high-pressure turbine disks of the Snecma M88 engine and has been extensively studied. size distribution its γ′ precipitates was first modelled in late 1980's using a binary alloy model [1]. precipitation recently revised, upgraded pseudo-binary multi-scale mechanical calculation fatigue life low cycle conditions [2]. We here present how new calibration N19 superalloy accelerated through use Thermo-Calc® software, TCNI5...
Chromium-based alloys are considered as potential candidates for applications in hot sections of aero engine turbines due to their high melting point and moderate density. Some ternary (Cr-Ni-Al) quaternary (Cr-Ni-Al-Ti) have been designed with the aim induce precipitation ordered strengthening precipitates promote formation a protective alumina scale. These were cast using various techniques order assess microstructural mechanical properties oxidation resistance.