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Portail > Offres > Offre UMR6634-CHRVUR-029 - Chercheur(se) pour modéliser à l'échelle atomique la propagation de l'interface austénite/martensite (H/F)

Researcher to model at atomic scale the migration of austenite/martensite interface (M/F)

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : vendredi 21 mai 2021

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General information

Reference : UMR6634-CHRVUR-029
Workplace : ST ETIENNE DU ROUVRAY CEDE
Date of publication : Friday, April 30, 2021
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 16 August 2021
Proportion of work : Full time
Remuneration : between EUR 2648 and 3768 gross monthly salary according to experience
Desired level of education : PhD
Experience required : 1 to 4 years

Missions

The candidate will be hired in the context of the project ANR C-TRAM (project “Redistribution of carbon at austenite/martensite interface during martensitic phase transformation”). This project is started in 2018.

Martensitic steels are of high applicational relevance due to their extraordinary strength and the adjustability of their strength, toughness and formability over a wide range by simple technological treatments. The bulk properties of martensitic steels are sensitively depending on the volume fraction, morphology, composition and intrinsic properties of the martensitic phase. These are determined by the local structural processes during the austenite-to-martensite transformation as well as the post-processing of the martensite. Then, austenite/martensite interfaces play a key role in the development of microstructures and mechanical properties in these steels. The interface velocities, which partly depend on their structure, will affect phase fractions and solute redistribution. In addition, the interaction of solutes with this interface is known to have a major influence on their mobilities.

In this project we will primarily work on the binary Fe-C and ternary Fe-Ni-C systems. The main goal of this project is to apply the atomistic model , based on the Onsager kinetic equation, to simulate the propagation of austenite/ martensite interface. The development of the atomistic approach will have two main objectives. The first will be to make quantitative the numerical approach based of the Quasi-Particules (QA) model developed by the ERAFEN team from GPM, in order to simulate the structure of the austenite/martensite interface in materials approaching the actual study cases. Special attention will be paid to segregation phenomena of carbon atoms at interface. In the second time the simulation results will be compared with available experimental data.

The simulations, based on the QA, will be carried out using the code already developed in GPM. In this context, GPM programming might be considered. The simulations will be performed on the CRIANN supercomputer.
The candidate will collaborate in his work with our partners of the Max Planck institute in Düsseldorf, Germany.

Activities

- Development of the simulation code for the QA approach for the binaries and ternaries systems where solute atoms occupy the interstitial and substitutional positions.
- Development of new interaction potentials between solute and iron atoms for the Quasi-particles method
- Writing of one or two articles in peer-reviewed journals.

Skills

- The candidate must hold a PhD in Physics or Materials Science.
- In the ideal case, the scientific skills of the candidate will be threefold, including material science and numerical simulation.
- A minimal requirement for the application, will be the extended skills in numerical simulation and computing/programming in one of these domains at least : numerical physics (molecular dynamics, Monte-Carlo, mesoscopic approaches such as Phase-Field models, etc.).
- Skills in Fortran (for Quasi-Particles simulations) and Python (for data treatment) computer language is mandatory.
- Knowledge in the field of martensitic phase transformation will be appreciated.

Work Context

The GPM (Groupe de Physique des Matériaux, UMR CNRS 6634) can be divided in 5 departments : Materials Aging-Mechanics/Scientific Instruments, Nanoscience, Disordered systems-Polymers, and Nano-Health-Physics. It gathers 160 working people, including 60 Teachers-researchers, 30 ITA and 70 PhD/Post-docs/Internships. The laboratory is located on the Campus Sciences et Ingénierie Rouen Normandie (Rouen), which belongs to the University of Normandy and the INSA Rouen Normandy school (7000m2). The hired researcher will assigned to the Science and Mechanics of Materials department, and will join the ERAFEN team (fundamental aspects of phase transitions at nanoscale-9 permanent researchers and teachers, 1 research engineer, 1 post-doc and 4 PD students). This team is specialized in the modelling and the simulation of phase transitions in materials, notably by means of phase-field and phase-field crystals/Quasi-Particles.

Constraints and risks

The researcher activity will consist in theoretical developments and computing, and will not show any specific risk.

Additional Information

5 months extension possible

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