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Job Record #19056 | |
Title | PhD on Solidification with convection and particle motion |
Category | PhD Studentship |
Employer | Institut Jean Lamour |
Location | France, Nancy |
International | Yes, international applications are welcome |
Closure Date | Friday, May 31, 2024 |
Description: | |
The research projectBackgroundMetallic materials are composed of crystal microstructures and their mechanical properties depend on the size, morphology, and chemical composition of these microstructures. In manufacturing of virtually all metal products, solidification processes, such as casting, welding, or additive manufacturing, are a decisive step for the formation of the microstructure. Understanding the link between process parameters and the microstructure of the product is particularly important for the improvement of properties of high- performance components with high added value, e.g., the impact toughness of steel nuclear reactor pressure vessels or the fatigue strength of turbine blades in an aircraft engine. During the solidification of a metal alloy, the solid crystal structure often forms in the shape of dendritic grains. The dendrites, a few millimeters in size, first grow freely in the liquid and can move during their growth. They are carried by the flow and are spread across the whole solidifying piece, which can be several meters in size. They sediment, pack, and continue to grow until complete solidification. The structure of the solidified piece depends strongly on these transport phenomena. Our work on the dynamics of motion of dendritic grains has shown that the transition between the zone of free-floating grains and the packed layer of stationary grains occurs across a narrow zone, with the thickness of about 5 times the grain size. In this packing zone, the distance between the grains decreases rater abruptly and the coupling between the flow of the liquid, the motion of the grains and their growth leads to high variations of chemical composition and temperature. Today, a theory to describe the packing zone does not exist. The phenomena in this zone are one of the key factors for the formation of the nonuniform structure and chemical composition in castings.Objectives and MethodsThe objective of the PhD thesis is to answer the following questions:
Requirements for applicants
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Contact Information: | |
Please mention the CFD Jobs Database, record #19056 when responding to this ad. | |
Name | Miha Založnik |
miha.zaloznik@univ-lorraine.fr | |
Email Application | Yes |
URL | http://ijl.univ-lorraine.fr |
Record Data: | |
Last Modified | 15:26:55, Monday, March 18, 2024 |
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