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CEMEF 2022 PhD thesis: Modeling of continuous dynamic recrystallisation (CDRX).

Postée le 28 avr.

Lieu : CEMEF, an internationally-recognized research laboratory of MINES ParisTech located in Sophia-Antipolis, on the French Riviera.  · Contrat : CDD · Rémunération : Annual gross salary: about 26k €

Société : Mines Paris - CEMEF

CEMEF, which stands for Centre de Mise en Forme des Matériaux, or Centre for Material Forming, is a leading research centre in the field of material forming. It was created in 1974 and is located in the Sophia Antipolis science park, near Nice in the south of France. It is a research laboratory of MINES ParisTech and has been associated with CNRS, the French National Science Foundation since 1979.
CEMEF develops global approaches in material forming (polymers, bio-polymers, elastomers, metals, alloys...), combining physics, physical chemistry, mechanics, thermics, modelling, numerical simulation (finite element methods, meshing, fluid-structure coupling...). The scientific developments are applied to forming processes: injection molding, extrusion, forging, machining, rolling, welding... It has about 160 people, including 70 PhD students.
Around 15 PhD projects, with industrial collaborations, are anticipated for a start in October.
Find all the details, and online application, on the Cemef website: https://www.cemef.minesparis.psl.eu/en/open-phd-positions/

Description du poste

Context and goals of the PhD

One of the European Union’s objectives in climate change consists of reaching net-zero greenhouse gas emissions by 2050. Such per- spective puts the metallic materials industry, as a large contribu- tor to carbon emissions, under tremendous pressure for change and requires the existence of robust computational materials strate- gies to enhance and design, with a very high confidence degree, new metallic materials technologies with a limited environmental impact. From a more general perspective, the in-use properties and durability of metallic materials are strongly related to their microstructures, which are themselves inherited from the thermo- mechanical treatments.
Hence, understanding and predicting microstructure evolutions are nowadays a key to the competitiveness of industrial companies, with direct economic and societal benefits in all major economic sectors (aerospace, nuclear, renewable energy, and automotive in- dustry).
Multiscale materials modeling, and more precisely simulations at the mesoscopic scale, constitute the most promising numeri- cal framework for the next decades of industrial simulations as it compromises between the versatility and robustness of physically- based models, computation times, and accuracy. The digimu con- sortium is dedicated to this topic at the service of major industrial companies.
In this context, the efficient and robust modeling of evolving in- terfaces like grain boundary networks is an active research topic, and numerous numerical frameworks exist. In the context of hot metal forming and when large deformation of the calculation do- main and the subsequent migration of grain boundary interfaces are involved, a new promising, in terms of computational cost, 2D front tracking method called ToRealMotion algorithms [1,2] was recently developed.
This PhD will be firstly dedicated to the extension of existing nu- merical framework dedicated to the modeling of discontinuous dy- namic recrystallization where recovery is not a predominant mech- anism to the context of CDRX where progressive evolution of sub- grain interfaces (low misorientation) into grain boundaries (high misorientation) by dislocation accumulation, annihilation and re- arrangement must be considered. Pre-existing developments [3] in context of a level-set full-field formulation will be improved and this mechanism will also be integrated to the ToRealMotion front-tracking algorithms.
The developments will be tested/optimized for pre-existing exper- imental data concerning two aluminum grades and one zirconium alloy. Concerning Al grades, the first one (6016 Al alloy) is of great interest for Constellium in automotive applications and the second one (7010 Al alloy) is of great interest for Aubert&Duval Issoire in aeronautic applications. Finally, Zircaloy-4, used mainly by Framatome in nuclear cladding applications, will also be considered.
The developments will be integrated in the DIGIMU® software.

More details on:

Profil recherché

Degree: MSc or MTech in Metallurgy, with excellent academic record.
Skills: Numerical Modeling, Metal- lurgy, proficiency in English, ability to work within a multi-disciplinary team.

Pour postuler :

Applications are made exclusively online. Complete the online application on https://applyfor.cemef.mines-paristech.fr/phd/

to which you will need to attach :
- your CV*
- official and detailed transcript of marks from your last years of studies
- 1 or 2 letters of recommendation (professor or supervisor)
*mandatory document to validate the application, the other documents can be sent later.