Caracterización Microestructural de Aleaciones de Zr-2.5Nb Mediante el Tratamiento Estadístico de Micrografías
2023
| Tesista | Mariana Lani Saumel Ingeniera Química. UBA - Argentina |
| Directores | Dra. Patricia B. Bozzano. CNEA, CONICET - Argentina |
| Lugar de realización | División Microscopía Electrónica del Departamento Caracterización y Fractomecánica - Gerencia de Materiales, GAEN -CNEA - Argentina |
| Fecha Defensa | 5/12/2023 |
| Jurado | Ing. Mariana Arias. GAEN, Instituto D.Beninson - Argentina |
| Código | IT/TM: 237/23 |
Resumen
Complete Title
Microstructural Characterization of Zr-2.5Nb Alloys by Statistical Treatment of Micrographs.
Abstract
The Embalse Nuclear Power Plant (CNE) is a CANada Deuterium Uranium
(CANDU) type reactor. CANDU reactor pressure tubes are made of Zr-2.5Nb alloy. This
alloy has a biphasic αZr+βNb structure, with the α-Zr phase being the majority phase.
One of the CNE's acceptance criteria for Zr-2.5Nb alloy pressure tubes is based
on the α-Zr phase width. This measurement is made by scanning electron microscopy
(SEM) and is manually measured by software, taking an average of 2500 measurements
per sample. In this work, a semi-automatic phase width measurement method was
developed through image analysis, superimposing grids at different angles and
processing the data obtained through a method based on experimental data and
statistical indicators, in order to minimize the influence of the human factor.
The developed methods were subjected to statistical tests in order to verify their
goodness of fit and robustness, demonstrating that the developed method is robust and
meets the established criteria of precision and veracity, which makes it a possible
method to be used at routinely for the measurement of the α-Zr phase width
(CANDU) type reactor. CANDU reactor pressure tubes are made of Zr-2.5Nb alloy. This
alloy has a biphasic αZr+βNb structure, with the α-Zr phase being the majority phase.
One of the CNE's acceptance criteria for Zr-2.5Nb alloy pressure tubes is based
on the α-Zr phase width. This measurement is made by scanning electron microscopy
(SEM) and is manually measured by software, taking an average of 2500 measurements
per sample. In this work, a semi-automatic phase width measurement method was
developed through image analysis, superimposing grids at different angles and
processing the data obtained through a method based on experimental data and
statistical indicators, in order to minimize the influence of the human factor.
The developed methods were subjected to statistical tests in order to verify their
goodness of fit and robustness, demonstrating that the developed method is robust and
meets the established criteria of precision and veracity, which makes it a possible
method to be used at routinely for the measurement of the α-Zr phase width
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