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Electron bombardment fusion and continuous casting of uranium carbide. Fundamental study of the metallurgical and thermal processes; Fusion sous bombardement d'electrons et coulee continue de carbure d'uranium. Etude fondamentale des processus metallurgiques et thermiques

Abstract

During a pilot production run, about 1.200 kg of uranium carbide cylindrical rods were prepared by electron bombardment fusion and continuous casting in an apparatus making it possible to operate in a constant vacuum automatically. In order to make the most of the fusion technique used, it was necessary to resolve a certain number of problems involved in this production. It was found that the energy yield for the electron bombardment heating using accelerating voltages of about 10 kV was 100 per cent; about 40 per cent of the electrons are re-emitted by back-scattering. These electrons leave the surface with practically zero energy. The fusion technique leads to the elimination of the majority of the metallic impurities. In order to explain the variations in the non-metallic impurity contents the different reactions occurring in the molten uranium monocarbide have been determined. A micrographic study of the rods obtained has shown various types of crystallization depending on the rate of casting and, despite the uniaxial symmetry of the cooling, no texture has been observed, whatever the rate of fusion employed. The aspects of the fracture surfaces observed on certain rods can be explained by theory in the domain where the material is  More>>
Authors:
Trouve, J [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Feb 01, 1968
Product Type:
Thesis/Dissertation
Report Number:
CEA-R-3524
Resource Relation:
Other Information: TH: These sciences physique; 39 refs; PBD: Feb 1968
Subject:
36 MATERIALS SCIENCE; CASTING; COOLING; CRACKS; CRYSTALLIZATION; ELECTRON BEAMS; ELECTRON SOURCES; ENERGY YIELD; FORMATION FREE ENTHALPY; FUEL RODS; GRAIN SIZE; IMPURITIES; MELTING; RUPTURES; TEXTURE; THERMAL STRESSES; URANIUM CARBIDES
OSTI ID:
20523309
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR04R3524091364
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[78] pages
Announcement Date:
Dec 10, 2004

Citation Formats

Trouve, J. Electron bombardment fusion and continuous casting of uranium carbide. Fundamental study of the metallurgical and thermal processes; Fusion sous bombardement d'electrons et coulee continue de carbure d'uranium. Etude fondamentale des processus metallurgiques et thermiques. France: N. p., 1968. Web.
Trouve, J. Electron bombardment fusion and continuous casting of uranium carbide. Fundamental study of the metallurgical and thermal processes; Fusion sous bombardement d'electrons et coulee continue de carbure d'uranium. Etude fondamentale des processus metallurgiques et thermiques. France.
Trouve, J. 1968. "Electron bombardment fusion and continuous casting of uranium carbide. Fundamental study of the metallurgical and thermal processes; Fusion sous bombardement d'electrons et coulee continue de carbure d'uranium. Etude fondamentale des processus metallurgiques et thermiques." France.
@misc{etde_20523309,
title = {Electron bombardment fusion and continuous casting of uranium carbide. Fundamental study of the metallurgical and thermal processes; Fusion sous bombardement d'electrons et coulee continue de carbure d'uranium. Etude fondamentale des processus metallurgiques et thermiques}
author = {Trouve, J}
abstractNote = {During a pilot production run, about 1.200 kg of uranium carbide cylindrical rods were prepared by electron bombardment fusion and continuous casting in an apparatus making it possible to operate in a constant vacuum automatically. In order to make the most of the fusion technique used, it was necessary to resolve a certain number of problems involved in this production. It was found that the energy yield for the electron bombardment heating using accelerating voltages of about 10 kV was 100 per cent; about 40 per cent of the electrons are re-emitted by back-scattering. These electrons leave the surface with practically zero energy. The fusion technique leads to the elimination of the majority of the metallic impurities. In order to explain the variations in the non-metallic impurity contents the different reactions occurring in the molten uranium monocarbide have been determined. A micrographic study of the rods obtained has shown various types of crystallization depending on the rate of casting and, despite the uniaxial symmetry of the cooling, no texture has been observed, whatever the rate of fusion employed. The aspects of the fracture surfaces observed on certain rods can be explained by theory in the domain where the material is elastic. Furthermore it has been shown that a decrease in the brittleness occurs as a result of the formation of fine precipitates of the Wiedmanstatten structure type. (authors) [French] Au cours d'une fabrication pilote, environ 1 200 kg de barreaux cylindriques de carbure d'uranium ont ete prepares par fusion sous bombardement d'electrons et coulee continue dans un appareillage permettant d'operer d'une maniere automatique sous vide constant. Afin de tirer le meilleur parti possible de la technique de fusion utilisee, il importait de repondre a un certain nombre de questions soulevees par cette fabrication. Le rendement energetique du chauffage par bombardement d'electrons pour des tensions acceleratrices de l'ordre de 10 kV a ete trouve egal a 100 pour cent, environ 40 pour cent des electrons sont reemis par retrodiffusion. Ces electrons quittent la surface avec une energie pratiquement nulle. La technique de fusion employee conduit a l'elimination de la plupart des impuretes metalliques. Pour expliquer les variations de teneurs en impuretes metalloidiques, les differentes reactions se produisant dans le carbure d'uranium fondu ont ete determinees. L'etude par la methode micrographique des barreaux obtenus a permis de distinguer differents modes de cristallisation dependant de la vitesse de coulee et malgre la symetrie uniaxiale de refroidissement aucune texture n'a ete observee quelle que soit la vitesse de fusion employee. Les facies de rupture observes sur certains barreaux ont pu etre expliques par la theorie dans le domaine ou le materiau est elastique. En outre, une diminution de la fragilite produite par de fins precipites du type structure de Wiedmanstatten a ete mise en evidence. (auteurs)}
place = {France}
year = {1968}
month = {Feb}
}