Recrystallization study of electrical steel by in situ X-ray diffraction

Stage master 6 mois rémunéré

MINES Saint-Etienne

Personnes à contacter par le candidat

Andras Borbely, MINES Saint-Etienne






Recrystallization study of electrical steel by in situ X-ray diffraction

Nowadays, the demand for electrical energy is constantly increasing. To deal with this, energy grids and transformers are continuously optimized and redesigned. In this context, reducing more and more the energy loss in electricity transmission and distribution systems is a real concern.
Electrical steel plays a key role wherever electrical energy is efficiently generated, converted or used. The best example is transformers. They need grain oriented electrical steel (GOES) to be able to function efficiently, their performance being directly determined by the bulk magnetic domain structure and by the mobility of the domains walls.
The magnetic properties of GOES are strongly dependent on material crystallographic texture. Obtaining such oriented grain structure over macroscopic lengths is a real metallurgical challenge and in practice it is difficult to be optimized by industrial interrupted test measurements. In industrial environments, a few hundred of tests could be usually necessary for technology and product development, which is expensive and time consuming.
Within the frame of this master thesis we propose to use high energy synchrotron radiation for following in situ the crystallographic orientation change during annealing and recrystallization of iron-silicon samples. The in situ approach allows accurate characterization of grain orientation (crystallographic texture) with excellent time and temperature resolution, which could radically reduce technology development cost and time.
Experiments will be done at the Advanced Photon Source synchrotron in Chicago. The evaluation of diffraction images will be performed with already existing scientific software, but basic knowledge of Python or Matlab will be necessary. This work is a collaboration between MINES Saint-Etienne and thyssenkrupp Electrical Steel UGO, for which reason a short stay of the student at the company is also foreseen.

Internship duration: 6 months, starting preferably in March 2020
Salary: French SMIC