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Properties of low content uranium-molybdenum alloys which may be used as nuclear fuels; Proprietes des alliages uranium-molybdene de faibles teneurs utilisables comme materiaux combustibles

Abstract

Metallurgical properties are given in this report of uranium-molybdenum alloys containing 0,5 to 3 per cent of molybdenum. Since some of these alloys are used in EDF power reactors are given: briefly the operating conditions imposed on nuclear fuels: maximum temperature, temperature gradient and external pressure. In the first part are considered the structural properties of the alloys correlation with the phase transformation kinetics; a description is given of the effects of certain physico-metallurgical factors on the morphology and the crystalline structure of the materials: - solidification conditions and the heredity of the {gamma} structure, - cooling rate at the transformation points, - whether or not the intermediate {gamma} {yields} {beta} transformation is suppressed In the second part we show how a knowledge of the phase transformation processes has made it possible to define the optimum preparation conditions for these materials in the form of fuel tubes intended for the EDF reactors: casting conditions, controlled cooling treatments, weldability. In the third part we study the thermal, stability during the long duration high temperature treatments and the cycles in the two zones of the diagram {alpha} + {gamma}; {beta} + {gamma} the effects of the morphology (in particular the two types  More>>
Authors:
Lehmann, J; Decours, J [1] 
  1. Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires
Publication Date:
Jul 01, 1964
Product Type:
Technical Report
Report Number:
CEA-R-2568
Resource Relation:
Other Information: 10 refs
Subject:
36 MATERIALS SCIENCE; CREEP; CRYSTAL STRUCTURE; CRYSTAL-PHASE TRANSFORMATIONS; GRAIN GROWTH; GRAIN SIZE; KINETICS; METALLURGICAL EFFECTS; MOLYBDENUM ALLOYS; URANIUM BASE ALLOYS; URANIUM-MOLYBDENUM FUELS
OSTI ID:
20795927
Research Organizations:
CEA Saclay, 91 - Gif-sur-Yvette (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR06R2568097964
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
44 pages
Announcement Date:
Dec 19, 2006

Citation Formats

Lehmann, J, and Decours, J. Properties of low content uranium-molybdenum alloys which may be used as nuclear fuels; Proprietes des alliages uranium-molybdene de faibles teneurs utilisables comme materiaux combustibles. France: N. p., 1964. Web.
Lehmann, J, & Decours, J. Properties of low content uranium-molybdenum alloys which may be used as nuclear fuels; Proprietes des alliages uranium-molybdene de faibles teneurs utilisables comme materiaux combustibles. France.
Lehmann, J, and Decours, J. 1964. "Properties of low content uranium-molybdenum alloys which may be used as nuclear fuels; Proprietes des alliages uranium-molybdene de faibles teneurs utilisables comme materiaux combustibles." France.
@misc{etde_20795927,
title = {Properties of low content uranium-molybdenum alloys which may be used as nuclear fuels; Proprietes des alliages uranium-molybdene de faibles teneurs utilisables comme materiaux combustibles}
author = {Lehmann, J, and Decours, J}
abstractNote = {Metallurgical properties are given in this report of uranium-molybdenum alloys containing 0,5 to 3 per cent of molybdenum. Since some of these alloys are used in EDF power reactors are given: briefly the operating conditions imposed on nuclear fuels: maximum temperature, temperature gradient and external pressure. In the first part are considered the structural properties of the alloys correlation with the phase transformation kinetics; a description is given of the effects of certain physico-metallurgical factors on the morphology and the crystalline structure of the materials: - solidification conditions and the heredity of the {gamma} structure, - cooling rate at the transformation points, - whether or not the intermediate {gamma} {yields} {beta} transformation is suppressed In the second part we show how a knowledge of the phase transformation processes has made it possible to define the optimum preparation conditions for these materials in the form of fuel tubes intended for the EDF reactors: casting conditions, controlled cooling treatments, weldability. In the third part we study the thermal, stability during the long duration high temperature treatments and the cycles in the two zones of the diagram {alpha} + {gamma}; {beta} + {gamma} the effects of the morphology (in particular the two types of {alpha} pseudo-grains observed) and of the cooling rate during the transformation point transitions are described. In the fourth part are discussed the mechanical properties: resistance to a tractive force, resistance to creep, resilience. These properties can also be affected by the {gamma} structure heredity and by the cooling rate to which the alloy has been subjected. In conclusion we discuss the reasons which led to the choice of some of these alloys for the first EDF reactors in particular the advantages of their high creep resistance between 450 and 600 deg C for use in the form of tubes subjected to an external pressure. (authors) [French] Dans ce rapport sont presentees les caracteristiques metallurgiques des alliages uranium-molybdene de teneurs comprises entre 0,5 et 3 pour cent en poids de molybdene. Certains de ces alliages etant utilises dans les piles de puissance EdF, nous indiquons brievement les conditions de fonctionnement demandees aux materiaux combustibles: temperature maximum, gradient de temperature et pression externe. Dans une premiere partie sont etudiees les proprietes structurales des alliages en correlation avec les cinetiques des transformations de phases, nous decrivons les incidences de differents facteurs physico-metallurgiques sur la morphologie et sur la structure cristalline des materiaux: - conditions de solidification et heredite de la structure {gamma}, - vitesse de refroidissement au passage des points de transformation - suppression ou non de la transformation intermediaire {gamma} {yields} {beta} Dans une seconde partie, nous indiquons comment la connaissance des processus des transformations de phase a permis de definir les conditions d'elaboration optimales de ces materiaux sous forme de tubes de combustibles destines aux reacteurs EdF: conditions de coulee traitement de refroidissement controle, soudabilite. Dans une troisieme partie, nous etudions la stabilite thermique au cours de paliers de longue duree a haute temperature et de cycles, dans les deux domaines du diagramme d'equilibre {alpha} + {gamma}, {beta} + {gamma}; les influences de la morphologie (en particulier des deux types de pseudo-grains {alpha} observes) et de la vitesse de refroidissement lors du passage des points de transformation sont discutees. Dans une quatrieme partie, les proprietes mecaniques sont discutees resistance a la traction, resistance au fluage, resilience. Ces proprietes peuvent etre egalement influencees par l'heredite de la structure {gamma} et par la vitesse de refroidissement subie par l'alliage. En conclusion, nous developpons les raisons qui ont motive le choix de certains de ces alliages pour les premieres piles EdF, en particulier les avantages de leur resistance au fluage elevee entre 450 et 600 deg C pour une utilisation sous forme de tubes soumis a la pression externe. (auteurs)}
place = {France}
year = {1964}
month = {Jul}
}