Efecto de la temperatura de colada sobre la fluidez, contracción volumétrica, contracción sólida, volumen de rechupe y dureza en esferas de aleación zinc – 27% aluminio (ZA-27) colados en molde de arena.
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Date
2025-04
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Universidad Nacional de Trujillo
Abstract
En esta investigación se analizó el efecto de la temperatura de colada entre 500 °C a 700
°C sobre la fluidez, contracción volumétrica, contracción sólida, volumen de rechupe y dureza
en aleación Zn – 27 % Al (ZA-27) mediante colada en molde de arena. Se llevaron a cabo
ensayo de fluidez, se utilizaron probetas espirales de acuerdo con el método Shneider y probetas
esféricas de 55 mm de diámetro para evaluar la contracción volumétrica, sólida y volumen de
rechupe. Respecto a ensayo de dureza y análisis microestructural, se empleó probetas que
cumplen con la norma ASTM E140.
Los hallazgos obtenidos en los experimentos revelan que fluidez, contracción
volumétrica, sólida y volumen de rechupe tiene una relación directamente proporcional con la
temperatura de colada, la razón de esto es de un calentamiento excesivo, posponiendo la
nucleación y cantidad de fluido líquido al canal.
También muestra que respecto a la dureza tiene una relación inversa con la temperatura
de colada, dado que el tiempo de solidificación se prolonga provocando un crecimiento en el
tamaño de grano.
Se concluye que la temperatura de colada de aleación Zn – 27 % Al (ZA - 27) influye
significativamente sobre las propiedades analizadas, con confianza estadístico del 95 %.
In this research, it was analyzed how the casting temperature between 500 °C to 700 °C affects the fluidity, volumetric contraction, solid contraction, shrinkage volume and hardness in Zn – 27% Al (ZA-27) alloy by mold casting. of sand. Fluidity tests were carried out, spiral probes were used according to the Shneider method and spherical probes of 55 mm diameter to evaluate volumetric, solid shrinkage and shrinkage volume. Regarding a hardness test and microstructural analysis, probes that comply with the ASTM E140 standard were used. The findings obtained in the experiments reveal that fluidity, volumetric contraction, solidity and shrinkage volume have a directly proportional relationship with temperature. casting, the reason for this is excessive heating, postponing the nucleation and amount of liquid fluid to the channel. It also shows that with respect to hardness it has an inverse relationship with temperature. casting, since the solidification time is prolonged causing a growth in grain size. analyzed properties, with statistical confidence of 95%.
In this research, it was analyzed how the casting temperature between 500 °C to 700 °C affects the fluidity, volumetric contraction, solid contraction, shrinkage volume and hardness in Zn – 27% Al (ZA-27) alloy by mold casting. of sand. Fluidity tests were carried out, spiral probes were used according to the Shneider method and spherical probes of 55 mm diameter to evaluate volumetric, solid shrinkage and shrinkage volume. Regarding a hardness test and microstructural analysis, probes that comply with the ASTM E140 standard were used. The findings obtained in the experiments reveal that fluidity, volumetric contraction, solidity and shrinkage volume have a directly proportional relationship with temperature. casting, the reason for this is excessive heating, postponing the nucleation and amount of liquid fluid to the channel. It also shows that with respect to hardness it has an inverse relationship with temperature. casting, since the solidification time is prolonged causing a growth in grain size. analyzed properties, with statistical confidence of 95%.
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TECHNOLOGY::Chemical engineering::Metallurgical process and manufacturing engineering::Metallurgical manufacturing engineering