General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DES-24-0616
Thesis topic details
Category
Condensed Matter Physics, chemistry, nanosciences
Thesis topics
Study of the production of martensitic stainless steel 13-4 by Laser Metal Deposition: influence of process parameters, powder characteristics and post-treatments on microstructure and mechanical properties at fracture
Contract
Thèse
Job description
Additive manufacturing processes are now widely studied for numerous applications in the nuclear industry. The aim of the studies dedicated to optimising the Laser Metal Deposition (LMD) metal additive manufacturing process for the production and shaping of a 13-4 martensitic stainless steel is to obtain a material with mechanical properties at fracture, particularly in terms of impact strength, that comply with the specifications for use. This work explores the complex relationships between the microstructural characteristics (phase present, granular structure, texture, precipitation, etc.) induced by the process and the resulting mechanical performance.
Additive manufacturing, in particular the LMD process, offers multiple advantages in terms of design flexibility and customisation of metal components. However, obtaining mechanical properties at fracture that meet specifications is a major challenge, particularly for high-temperature applications in corrosive environments.
This thesis focuses on the optimisation of the LMD process to ensure that components manufactured from 13-4 martensitic stainless steel exhibit microstructural characteristics and mechanical performance appropriate to their intended applications, with particular emphasis on impact properties. Determining the optimum process parameters, including the characteristics of the powders and associated post-treatments, the analysis of the microstructure, and the correlation between the microstructure and the mechanical properties constitute a major challenge for the complete control of this process.
University / doctoral school
Sciences Mécaniques et Energétiques, Matériaux et Géosciences (SMEMaG)
Paris-Saclay
Thesis topic location
Site
Saclay
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
GIROUX Pierre-François pierre-francois.giroux@cea.fr
CEA
DES/DRMP//LTMEx
CEA Paris-Saclay
Laboratoire de Technologie des Matériaux Extrêmes
DES/ISAS/DRMP/SRMA/LTMEx
Bât. 460 – Pièce 210
P.C. 52
91191 GIF-SUR-YVETTE CEDEX
01 69 08 45 69
Tutor / Responsible thesis director
AUBRY Pascal pascal.aubry@cea.fr
CEA
DES/DRMP//LISL
Pascal AUBRY
Directeur de recherche
CEA/DES/ISAS/DRMP/SRMA/LISL
Bat. 467 pc. 120
91191 Gif-sur-Yvette Cedex
0662602029
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