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Publications associées (143)

Transition of the mushy zone from continuous liquid films to a coherent solid

While studies of solidification microstructures have focused mainly on the tips of the dendrites, the last stage solidification is equally important from the point of view of defect formation (porosity, hot tearing), mechanical strength build-up and precip ...

2006

An elastic-visco-plastic analysis of ductile expanding ring

Jean-François Molinari

We investigate the fragmentation of an elastic visco-plastic ring in the one-dimensional framework. The governing equations include the effects of large deformation, geometric softening, hydrostatic pressure and material's viscoplasticity. Linear perturbat ...

Elsevier2006

Coalescence and mechanical behaviour of semi-solid aluminium alloys in relation to hot tearing

Piero Daniele Grasso

Semi-continuous direct-chill (DC) casting of aluminium ingots suffers from a very frequent defect which can lead to a strong decrease in productivity: hot tearing. This phenomenon takes place in the mushy state (i.e., at solid fractions, gs, lower than uni ...

EPFL2004

Managing Systemic Innovations in Rail Systems: The case of ERTMS technologies

Daniel Emery, Anne Curchod, Guillaume De Tilière

Interoperability has become a keyword in the European Transport Policy, with the strong objective to improve transportation services. In the rail sector, this trend is embodied in technological innovations: A deep change in the communication and signalling ...

2003

Discontinuously reinforced titanium matrix composites for fusion applications

We have reinforced alpha-Ti with different contents of TiC particles using the in situ technique and conventional casting. Compositional and microstructural characterization of the TiC/Ti composite material was made by XRD and SEMEDS. Tensile tests at RT, ...

2002

Hot Tear formation and coalescence observations in organic alloys

Michel Rappaz, Jean-Marie Drezet, Piero Daniele Grasso

Hot tear formation has been observed during the solidification of a succinonitrile–acetone (SCN-acetone) alloy by pulling the columnar dendrites in the transverse direction with a stick. It is observed that the cracking of the mushy zone (hot tears) always ...

TMS Publ.2002

STUDY AND MODELING OF HOT TEARING FORMATION

Michel Rappaz, Jean-Marie Drezet

As for most of the topics in the field of solidification, Mert Flemings has always pioneered new ideas. While much of the understanding of hot tearing formation was already known about 30 years ago, he devised with Metz an interesting apparatus for studyin ...

TMS Public.2001

Finite-element modeling of dry sliding wear in metals

Jean-François Molinari, Raul Radovitzky

This paper is concerned with the calibration and validation of a finite-element model of dry sliding wear in metals. The model is formulated within a Lagrangian framework capable of accounting for large plastic deformations and history-dependent material b ...

2001

Direct chill and electromagnetic casting of aluminium alloys: Thermomechanical effects and solidification aspects

Jean-Marie Drezet

The tolerances of semi-continuously cast products of aluminium alloys are very critical if the scalping of the ingot faces is to be minimised before rolling. In the steady state regime of casting, the dimensions of the section of the solidified ingot are l ...

EPFL2000

Determination of thermophysical properties and boundary conditions of DC cast aluminum alloys using inverse methods

Michel Rappaz, Jean-Marie Drezet

In order to quantify the cooling conditions undergone by an ingot during direct-chill (DC) casting, thermocouples were immersed in the liquid pool and consequently entrapped in the solid, thus monitoring the temperature of the metal during its descent. Ass ...

2000

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