Modelling of the compaction phase during Hot Isostatic Pressing process at the mesoscopic scale

Ala Zouaghi (1) , Michel Bellet (1) , Yves Bienvenu (2) , Gilles Perrin (3) , Denis Cédat (3) , Marc Bernacki (1)

1 CEMEF - Centre de Mise en Forme des Matériaux
2 CDM - Centre des Matériaux
3 AREVA NP

During Hot isostatic pressing (HIP) of metal powder, power-law creep is the dominant mechanism during the densification process. However, the understanding of the global impact of the thermo-mechanical boundary conditions and of the powder granulometry on the microstructure obtained after this first mechanism is not straightforward. A finite element methodology based on the use of a level set framework coupled with a remeshing technique is proposed in order to model the viscoplastic deformation of powder particles during HIP at the mesoscopic scale thanks to a Representative Elementary Volume. The methodology consists in generating, in a finite element mesh, a sphere packing of particles by representing implicitly all particles by means of a limited set of level-set functions. Mesh adaptation is also performed at particle boundaries to describe properly the particles and to manage the discontinuity of the physical properties. Such 2D scale mesoscopic densification simulations are presented and discussed

Mots clés: HIP; powder densification; level-set function; remeshing technique; mesoscopic scale

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Ala Zouaghi, Michel Bellet, Yves Bienvenu, Gilles Perrin, Denis Cédat, et al.. Modelling of the compaction phase during Hot Isostatic Pressing process at the mesoscopic scale. Advances in Powder Metallurgy and Particulate Materials - 2012, Jun 2012, Nashville, United States. pp.3117-3125 - ISBN 978-0-9853-3972-2. ⟨hal-00933205⟩