Stella, Valentina M. (2024) Estudio de cambios espaciales de la textura cristalográfica mediante técnicas de transmisión de neutrones / Study of spatial changes in crystallographic texture using neutron transmission techniques. Maestría en Ingeniería, Universidad Nacional de Cuyo, Instituto Balseiro.
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Resumen en español
En el presente trabajo, se propone caracterizar la variación espacial de la textura cristalográfica a partir de transmisión de neutrones con resolución en energía. Se ha desarrollado y aplicado el método de imágenes de bordes de Bragg con resolución espacial para analizar la evolución de polos de la textura, en un caso particularmente adecuado para esta técnica. Se trata de la zona de trabajo correspondiente al primer paso de laminado en frío de un tubo de Zircaloy-4. El Zircaloy-4 es ampliamente utilizado en la industria nuclear para fabricar tubos de revestimiento de combustible en reactores nucleares. Su fabricación incluye múltiples pasos de laminado en frío con tratamientos térmicos intermedios de recristalización. Este proceso genera cambios en la textura del material, cuya caracterización es de interés para la CNEA debido a su impacto en la anisotropía de las propiedades físicas y, por ende, en el rendimiento de las piezas en servicio. En trabajos anteriores, se caracterizó la evolución de la textura de estos tubos durante el primer paso de laminación mediante difracción de neutrones. Sin embargo, este caso es ideal para estudiar mediante imágenes de borde de Bragg, ya que el cambio en la textura se ve reflejado en una rotación de 30° de los cristales alrededor del eje c. Esta rotación resulta en un cambio en las alturas de los bordes de Bragg en los polos (11¯20) y (10¯10) en la dirección axial, debido a que esta altura es proporcional a la cantidad de cristales con dirección paralela a la del haz utilizado en las imágenes con neutrones. En el experimento, llevado a cabo en el instrumento BOA del Instituto Paul-Scherrer, el haz estaba alineado paralelo a la dirección axial del tubo. El método aplicado sin resolución espacial ofreció resultados consistentes con los de difracción de neutrones y, con la adición de resolución espacial, se detectaron variaciones de textura con mayor precisión. Además, se sentaron las bases para continuar el desarrollo y mejora de esta técnica.
Resumen en inglés
In the present work, we propose to characterize the spatial variation of crystallographic texture from energy-resolved neutron transmission. The spatially resolved Bragg edge imaging method has been developed and applied to analyze the pole evolution of the texture, in a case particularly suitable for this technique. This is the working area corresponding to the first cold rolling step of a Zircaloy-4 tube. Zircaloy-4 is widely used in the nuclear industry to fabricate fuel cladding tubes in nuclear reactors. Its fabrication involves multiple cold rolling steps with intermediate recrystallization heat treatments. This process generates changes in the texture of the material, whose characterization is of interest to CNEA due to its impact on the anisotropy of the physical properties and, therefore, on the performance of the parts in service. In previous work, the texture evolution of these tubes was characterized during the first lamination step by neutron diffraction. However, this case is ideal for study by Bragg edge imaging, since the change in texture is reflected in a 30° rotation of the crystals around the c-axis. This rotation results in a change in the heights of the Bragg edges at the (11¯20) and (10¯10) poles in the axial direction, since this height is proportional to the number of crystals with direction parallel to that of the beam used in the neutron imaging. In the experiment, carried out on the BOA instrument of the Paul-Scherrer Institute, the beam was aligned parallel to the axial direction of the tube. The method applied without spatial resolution gave results consistent with those of neutron diffraction and, with the addition of spatial resolution, texture variations were detected more accurately. In addition, the basis for further development and improvement of this technique was laid.
| Tipo de objeto: | Tesis (Maestría en Ingeniería) |
|---|---|
| Palabras Clave: | Zirconium; Circonio; Spatial resolution; Resolución espacial; [Cold pilgering; Laminado en frio; Neutron imaging; Imágenes con neutrones; Crystallographic texture; Textura cristalográfica; Bragg edges; Bordes de bragg] Crystallographic texture; Textura cristalográfica; Bragg edges; Bordes de bragg] |
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| Materias: | Ingeniería nuclear > Técnicas neutrónicas Ingeniería nuclear > Materiales nucleares |
| Divisiones: | Gcia. de área de Energía Nuclear > Gcia. de Ingeniería Nuclear > LAHN |
| Código ID: | 1259 |
| Depositado Por: | Tamara Cárcamo |
| Depositado En: | 12 Sep 2024 14:45 |
| Última Modificación: | 12 Sep 2024 14:45 |
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