Incorporación de los aleantes a la esponja de zirconio para la obtención de lingotes de zircaloy 4 en escala de laboratorio
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Comisión Nacional de Energía Atómica; Argentina
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La aleación Sn- 12%Fe- 6%Cr fue estudiada a fin de ser eventualmente: utilizada como aleación madre en la producción de Zircaloy 4. Los componentes de esta aleación guardan entre sí la misma relación que la de los elementos de adición del Zircaloy 4 (Zr- l,5%Sn- 0,2%Fe- 0,l%Cr). L a estructura de solidificación de muestras preparadas en horno de inducción bajo atmósfera inerte fueron estudiadas mediante metalografía óptica, microscopía electrónica de barrido y difractometría de rayos X. Se identificaran las fases Sn(Fe,Cr), Sn2 (Fe/Cr ) y Sn en una microestructura típica de aleaciones peritécticas . Su rango de solidificación (1140°-231°C) fue determinado mediante termometría. La aleación es frágil y no pudo ser plásticamente deformada. Un procedimiento para preparar electrodos consumibles empleando esta aleación madre fue desarrollado. Consiste en el conformado ele pastillas mediante el cizallamiento de la aleación en estado pastoso, las cuales son luego incorporadas a la esponja de Zr durante la operación de briqueteado. Electrodos preparados mediante este, técnica fueron fundidos en horno de arco bajo vacío.
The alloy Sn- 12%Fe- 6%Cr was studied in order to eventually be used as a mother alloy in the production of Zircaloy 4. The components of this alloy have the same relationship between themselves as that of the addition elements of Zircaloy. 4 (Zr- l.5%Sn- 0.2%Fe- 0.l%Cr). The solidification structure of samples prepared in an induction furnace under an inert atmosphere were studied by optical metallography, scanning electron microscopy and X-ray diffractometry. The Sn(Fe,Cr), Sn2 (Fe/Cr) and Sn phases were identified. in a typical microstructure of peritectic alloys. Its solidification range (1140°-231°C) was determined by thermometry. The alloy is brittle and could not be plastically deformed. A procedure to prepare consumable electrodes using this parent alloy was developed. It consists of forming tablets by shearing the alloy in a pasty state, which are then incorporated into the Zr sponge during the briquetting operation. Electrodes prepared using this technique were cast in arc furnace under vacuum.
The alloy Sn- 12%Fe- 6%Cr was studied in order to eventually be used as a mother alloy in the production of Zircaloy 4. The components of this alloy have the same relationship between themselves as that of the addition elements of Zircaloy. 4 (Zr- l.5%Sn- 0.2%Fe- 0.l%Cr). The solidification structure of samples prepared in an induction furnace under an inert atmosphere were studied by optical metallography, scanning electron microscopy and X-ray diffractometry. The Sn(Fe,Cr), Sn2 (Fe/Cr) and Sn phases were identified. in a typical microstructure of peritectic alloys. Its solidification range (1140°-231°C) was determined by thermometry. The alloy is brittle and could not be plastically deformed. A procedure to prepare consumable electrodes using this parent alloy was developed. It consists of forming tablets by shearing the alloy in a pasty state, which are then incorporated into the Zr sponge during the briquetting operation. Electrodes prepared using this technique were cast in arc furnace under vacuum.