Technical skill sheet

Metallurgy Structure Rheology

  • Centre of research : MINES ParisTech, centre de mise en forme des matriaux - CEMEF
  • Prestation : Characterization, tries, tests, checks, formulation - Research and Development

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Know-how


Research concerns metallurgy, structure of metals, rheology analysis : characterisation of the strong relation between process and material microstructure.

Establishment of links between formation of structure of metallic materials, their evolution, mechanical comportment during shaping processes, occurrence of faults and final properties of a piece

Analysis of shaping processes : - cold and hot deep drawing (steel, aluminium and zirconium alloys) multi-pass forging (steel, aluminium, titan, copper, zirconium alloys) - rolling, cold and hot (aluminium alloys, steel in inter-critical domain) - steel wire drawing - impact and deformation at high velocity (aluminium foam and profiles, copper alloys, steel) - consolidation and rheology of porous media (powders, foams) - consolidation of composites with metallic matrix - moulding and foundry - solid and semi-solid thixotropic spinning (aluminium, magnesium) flow forms - rapid deformations

Applications


All of the domains linked to the automotive and aeronautic sectors, equipment for energy sector and consumer goods. The analysis of industrial materials (steel, titan, aluminium, zinc, magnesium, zirconium alloys and super-alloys).

Equipment


Forming machine : - single screw extruder Kaufman diam. 40 mm, single screw Collins for rubber extrusion, double screw Clextral BC45 - controlled rolling train (20 m/s) - hydroforming machines for pipes, hydroforming machines for metal sheets or bulge test - deep drawing press (30t) - injection compactor DK (110t)

Instrumented prototype for blowing double-drawing of bottles : - rheocord Haake (internal mixer, single screw extruder - rolling trains/compactors : - vertical compactor "Psidix" - horizontal compressor

Development department and work shop : CAO/DAO 3D IDEAS MS11 - 3 towers, one with digital controls - 3 milling machines, 2 with digital controls - 1 mini milling robot to turn around sample bar - 1 grinder - various machines for cutting, folding, welding, grit blasting

Microscopy : - optical transmission microscope (with microtraction device, film micro-compression, static crystallisation, in shear and in elongation) - inversed metallographic optical microscope Olympus PMG3

Scanning electron microscope : - environmental (Philips XL30 ESEM LaB6), heating plate Oxford 1500C, automatic EBSD with digital camera and Peltier effect plate Philips - Jeol 35CF - transmission and scanning electron microscopes (CM12 TEM/STEM Philips) with heated object holder 600C

Spectrometers : - EDX (Oxford/Inca on MEB Philips XL30 ESEM), (Tracor/Noran on MEB Jeol 35CF) - XPS (Riber MAC2) - static SIMS at flight time [ToF-SIMS] (PHI TRIFT I)

Infrared (Fourier transformed, microscope) - X-ray: diffractometer (X'pert Pro), texture goniometer, Debye Scherrer chamber

Physical measurements : small angle light diffusion - moulding goniometer - rugosimeter 3D - image analyser (Visilog 6.3) - machine for measurements of thermal exchange coefficients - enthalpic differential analyser (DSC Perkin Elmer) - measurement system (deformations, displacement and thickness) by image correlation (ARAMIS system) - non-contact measurements, flow and deformation visualisation : - machine tools with observation windows (injection cast with transparent walls, pipes) - Doppler laser anemometer (Dantec) - flow birefringence - high speed camera (125 to 2500 images/s) - videometric extensometer - mechanical properties : - hardness, cold and hot, micro hardness, macro hardness - Instrn traction (+/-100kN, heating up to 1200C, LN2 cooling, videometric traction and compression control system) - hydraulic traction-compression Dartec (300mm/s, +/-300kN) - hydraulic high-speed traction-compression Zwick (0.5 to 20 m/s, +/-20kN, up to 250C and LN2 cooling) - electro-mechanical traction for important displacements Erichsen - torsion Adamel-Lhomargy (heating up to 1200C) - mini-torsion with joule effect heating and resistivity control - hammering machine, drop shaft - furnace for thermal processing, vacuum or under atmosphere (1200C)

Rheometry : - capillary rheometers (Rhoplasts(r)) - rotative rheometers (imposed deformation Rheometrics RMS 800, imposed constraints Stresstech Rheologica) - rheo-optical devices (optical and plane-plane light diffusion microscopes, plane cone, coaxial cylinders, four rolls. Tubes and casts transparent. Microtraction).

Tribology : - punching, plane drawing - rotative tribometers, plane-plane

Thermomechanical wear machine - machine for tool steel wear - friction coefficient measurements of metal-polymers.