During laser processing of materials, at moderate intensity (kW/cm2-MW/cm2), materials are in the three phases: solid, liquid and vapor. Since many years, PIMM works on interaction laser matter in relation with welding, drilling cutting and additive manufacturing. Another application concerns gas industry for security of the O2 production plan. Confined Laser setup is unique and useful to study combustion of metals in the presence of pure O2.
Among recent key issues for interaction laser matter concerns the thermo-physical (thermal conductivity, surface tension, viscosity) and optical (absorption) properties of materials beyond their melting point.
PIMM has been developed an original method of pyrometry of field which allows a precise measurement of the temperature in a range between the liquid phase and the phase vapor of metallic materials heated by CW Laser( Liquid Phase combustion of iron in oxygen atmposphere- M Muller, H El-Rabii, R Fabbro J Matter science 2015 0:3337-3350);
Another promising technique allows the determination of the tension of surface in merging metallic droplet using laser heating.
One of the objective of this project is the implementation of new set-up: the aerodynamic levitation of droplets heated by laser and the coupling with optical pyrometry with high-speed camera to evaluate thermophysical properties as a function of temperature. These experimental parts are coupled with inverse methods, using the multi-physical code COMSOL, to determine properties and validate them.
Expertise : experimental, thermic, Material transformation, laser interaction... Materials: iron pure/Steel S355 / Stainless steel 316L, Nickel base alloys.
Duration : Post-doctoral contract for a two year-period.
Location : PIMM Laboratory, 151 Boulevard de l’Hopital, 75013 Paris
Applications should include a motivation letter and Curriculum Vitae with the addresses of two referees. Candidate, at the end of his post-doc, could present a CNRS research Position at PIMM based on the scientific project en in relation with present one.
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