Etude de l’élaboration de l’acier inoxydable 316L par fusion laser sélective sur lit de poudre : influence des paramètres du procédé, des caractéristiques de la poudre, et des traitements thermiques sur la microstructure et les propriétés mécaniques.

Aziz Chniouel 1
1 LISL - laboratoire d'ingénierie des surfaces et lasers
SEARS - Service d'études analytiques et de réactivité des surfaces : DEN/DPC/SEARS
Abstract : Additive Manufacturing (AM) recently became an attractive manufacturing process in several industrial fields such as aeronautics, aerospace and automotive. The exploitation of AM processes for the nuclear industry is currently being studied in different countries. The AM enables the creation of optimized parts with complex geometries impossible to manufacture with conventional processes. This thesis aims to determine the potential contribution of AM processes for the production of metal components for various nuclear applications including future Generation IV reactors. First, the microstructural and mechanical properties of 316L stainless steel parts built by Selective Laser Melting (SLM) process are presented. Three thematics were assessed in this study: the SLM process parameters, the powder characteristics and two post heat treatments (700 ° C-1h and hot isostatic pressing: 1100 ° C-3h under 1800 Bar). Their effects on microstructure and mechanical properties were analyzed. Tensile properties of 316L steel specimens were measured and compared to those of forged 316L steel described in the nuclear field by RCC-MRX standards. The results obtained are superior to those of the standard and comparable to those of a forged steel. This thesis contributes to a better understanding of interactions between the process parameters, the microstructure and the mechanical properties.
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Aziz Chniouel. Etude de l’élaboration de l’acier inoxydable 316L par fusion laser sélective sur lit de poudre : influence des paramètres du procédé, des caractéristiques de la poudre, et des traitements thermiques sur la microstructure et les propriétés mécaniques.. Matériaux. Université Paris-Saclay, 2019. Français. ⟨NNT : 2019SACLS379⟩. ⟨tel-02421550⟩

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