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Jean-Marie Drezet

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Related publications (46)

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Measurement of Mechanical Coherency Temperature and Solid Volume Fraction in Al-Zn Alloys Using In Situ X-ray Diffraction During Casting

Jean-Marie Drezet, Güven Kurtuldu, Bastien Gilbert Pierre Mireux

During solidification of metallic alloys, coalescence leads to the formation of solid bridges between grains or grain clusters when both solid and liquid phases are percolated. As such, it represents a key transition with respect to the mechanical behavior ...

Springer Verlag2015

Residual Stresses in DC cast Aluminum Billet: Neutron Diffraction Measurements and Thermomechanical Modeling

Jean-Marie Drezet

Thermally-induced residual stresses, generated during the industrial Direct Chill casting process of aluminum alloys, can cause both significant safety concerns as well as the formation of defects during down-stream processing. Although these thermally ind ...

Amer Inst Physics, 2 Huntington Quadrangle, Ste 1No1, D, Melville, Ny 11747-4501 Usa2011

Ventricle Equilibrium Position in Healthy and Normal Pressure Hydrocephalus Brains Using an Analytical Model

Jean-Marie Drezet, Kamal Shahim

The driving force that causes enlargement of the ventricles remains unclear in case of normal pressure hydrocephalus (NPH). Both healthy and NPH brain conditions are characterized by a low transparenchymal pressure drop, typically 1 mm Hg. The present pape ...

2012

Early precipitation during cooling of an Al-Zn-Mg-Cu alloy revealed by in situ small angle X-ray scattering

Jean-Marie Drezet, Helena Van Swygenhoven, Patrick Schloth

Early subnanometre cluster formation during quenching of a high-strength AA7449 aluminium alloy was investigated using in situ small angle X-ray scattering. Fast quench cooling was obtained by using a laser-based heating system. The size and number density ...

American Institute of Physics2014

Towards a Micro-Macro Model of Hot Tearing

Michel Rappaz, Jean-Marie Drezet, Stéphane Vernède, Vincent Mathier

Modelling of hot tearing must encompass several aspects: solidification, percolation of grains, stress/strain development, liquid feeding. The present contribution reviews recent progress made in this domain, both at the macro- and microscopic levels. At t ...

Trans Tech Publications2006

Prediction of quenching-induced stress distribution in 7XXX aluminium alloy thick plates using Gleeble interrupted quench tests

Jean-Marie Drezet, Nicolas Paul Henry Chobaut, Patrick Schloth

In the fabrication of heat treatable aluminum parts for the aeronautic industry, quenching is a key step to obtain the required mechanical characteristics after aging. For thick plates, thermal gradients cause non-homogeneous plastic strain resulting in re ...

Matthias Militzer, Gianluigi Botton, Long-Qing Chen, James Howe, Chadwick Sinclair, and Hatem Zurob2015

Residual stresses of friction melt bonded aluminum/steel joints determined by neutron diffraction

Jean-Marie Drezet

Near interfacial residual stresses are investigated in a joint composed of aluminum alloy and dual phase steel. A small step neutron diffraction scan was initially performed to determine the weld interface position along the measured transverse cross secti ...

ELSEVIER SCIENCE SA2019

Characterisation of precipitation upon cooling of an AA2618 Al-Cu-Mg alloy

Jean-Marie Drezet, Nicolas Paul Henry Chobaut

The precipitation of an AA2618 Al-Cu-Mg alloy is monitored during isothermal holdings and continuous coolings. The Time-Temperature-Property and Continuous-Cooling-Precipitation diagrams of AA2618 are obtained using in-situ resistivity and differential sca ...

Elsevier2016

Early cluster formation during rapid cooling of an Al-Cu-Mg alloy: In situ small-angle X-ray scattering

Jean-Marie Drezet, Helena Van Swygenhoven, Patrick Schloth

The formation of Cu-Mg clusters in an Al-Cu-Mg aluminum alloy is observed by small-angle X-ray scattering during cooling. Cooling rates are choosen to mimic the different conditions obtained at the surface and in the center of large forgings. Clusters of 0 ...

Elsevier2015

Fracture prediction during sawing of DC cast high strength aluminium alloy rolling slabs

Jean-Marie Drezet

The semicontinuous direct chill (DC) casting of large cross-section rolling sheet ingots of high strength aluminium alloys (2xxx and 7xxx series) gives birth to high residual (internal) stresses generated by a non-uniform cooling. These stresses must be re ...

Maney Publishing2007

Calculation of intracranial pressure in human brain using Darcy's and Biot's models

Jean-Marie Drezet, Kamal Shahim

Cerebrospinal fluid (CSF) is a colourless liquid that fills the ventricular space and serves several functions like buoyancy, chemical stability and protection. CSF is produced within the ventricles and partly by the ependyma cells. Part of it seeps toward ...

Taylor & Francis2011

Prediction of Hot Tear Formation in Vertical DC Casting of Aluminum Billets Using a Granular Approach

Michel Rappaz, Jean-Marie Drezet, Meisam Sistaninia

A coupled hydromechanical granular model aimed at predicting hot tear formation and stress-strain behavior in metallic alloys during solidification is applied to the semicontinuous direct chill casting of aluminum alloy round billets. This granular model c ...

Springer2013

Influence of a wiper on residual stresses in AA7050 rolling plate ingots

Jean-Marie Drezet

As-cast stresses in the foot of the ingot corresponding to the transient start-up phase of the direct chill casting have been determined in aluminum alloy AA7050 rectangular ingots. This high strength alloy is usually cast with a wiper that is placed below ...

Elsevier2014

Neutron Diffraction Measurement of As-Cast Residual Stresses in Aa7050 Rolling Plate Ingots: Influence of A Wiper

Jean-Marie Drezet

During casting, thermally induced deformations give birth to ingot distortions and residual stresses. For some high strength alloys, ingot cracking can happen during casting per se or during cooling down. Ingot distortions such as rolling face pull-in, but ...

John Grandfield2014

RESIDUAL STRESSES IN AS-CAST BILLETS: NEUTRON DIFFRACTION MEASUREMENT AND THERMOMECHANICAL MODELING

Jean-Marie Drezet

Stress relief treatment is often required prior to sawing aluminum DC cast products in order to prevent crack formation and significant safety concerns due to the presence of high residual stresses generated during casting. Numerical models have been devel ...

Carlos E. Suarez TMS (The Minerals, Metals & Materials Society), 20122012

On the Prediction of Hot Tearing in Al-to-Steel Welding by Friction Melt Bonding

Jean-Marie Drezet

Aluminum alloy AA6061 was welded to dual-phase steel 980 (DP980) by the friction melt bonding (FMB) process. Hot tears have been suppressed by controlling the thermomechanical cycle. In particular, the welding speed and the thermal conductivity of the back ...

2018

Two-phase modelling of hot tearing in aluminium alloys using a semi-coupled approach

Michel Rappaz, Jean-Marie Drezet, Vincent Mathier

Hot tearing, one of the most severe defects observed in castings, is due to both tensile stresses and lack of interdendritic liquid feeding in the mushy zone. In order to predict this phenomenon, the two-phase averaged conservation equations for mass and m ...

2007

Stress-Strain Predictions of Semisolid Al-Mg-Mn Alloys During Direct Chill Casting: Effects of Microstructure and Process Variables

Jean-Marie Drezet

The occurrence of hot tearing during the industrial direct chill (DC) casting process results in significant quality issues and a reduction in productivity. In order to investigate their occurrence, a new semisolid constitutive law (Phillion et al.) for AA ...

Springer Verlag2013

Stress generation during the quenching of large AA2618 forgings: Finite element computations and validation against neutron diﬀraction measurements

Jean-Marie Drezet, Nicolas Paul Henry Chobaut

Solutionising and quenching are key steps in the fabrication of heat treatable aluminium parts such as AA2618 compressor impellers for turbochargers. Quenching not only dictates the mechanical characteristics of the product but also induces residual stress ...

Elsevier2017

Experimental and numerical analysis of the hot tearing susceptibility of a CuCrZr alloy

Jean-Marie Drezet

The precipitation hardened CuCrZr alloy is used in fusion machines for the heat sink of intensely cooled plasma facing components (PFC) due to its good thermal and mechanical properties. Albeit, the feedback from its application in Tore Supra (French tokam ...

2010