Efecto del tiempo de revenido en una aleación cobre – 15% aluminio sobre la dureza, resistencia al desgaste, resistencia al impacto y microestructura
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Date
2024-04
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Universidad Nacional de Trujillo
Abstract
En esta investigación se ha estudiado el tiempo de revenido a 400ºC, en el intervalo de 1 a
10 horas, en la aleación cobre – 15% aluminio con temple en agua desde 900ºC y su efecto
sobre la dureza, resistencia al desgaste, resistencia al impacto y microestructura. Se
utilizaron probetas según norma ASTM E-10 para el ensayo de dureza, probetas según
norma ASTM G-77 para el ensayo de desgaste y probetas según norma ASTM E-23 para el
ensayo de impacto.
Los resultados muestran que la dureza, resistencia al desgaste y resistencia al impacto
aumentan con el incremento del tiempo de revenido hasta 4 horas, y para tiempos de revenido
mayores a 4 horas, la dureza, resistencia al desgaste y resistencia al impacto disminuyen hasta
10 horas de tiempo de revenido. Además, los valores obtenidos para todos los niveles del
tiempo de revenido en la aleación cobre – 15% aluminio son mayores que la aleación en
estado fundido, y según el desgaste, esta aleación en todos los niveles de tiempo de revenido
en estudio es muy resistente.
Microestructuralmente, la aleación cobre – 15% aluminio en estado fundido consta
de fase eutectoide y fase gamma 2, característica de una fundición hipereutectoide. La
aleación con temple y revenido hasta 4 horas consta de placas aciculares de fase alfa (α) en
una matriz de martensita revenida (β’) y para tiempos mayores de 4 horas hasta 10 horas
consta de alfa (α) y gamma 2 (γ2).
Con el tiempo de revenido de 4 horas, a 400ºC, la aleación cobre – 15% aluminio
obtuvo los mejores resultados de las propiedades en estudio. Los resultados obtenidos han
sido contrastados con un análisis de varianza con un nivel de confianza de 95%.
This research has studied the tempering time at 400ºC, in the interval of 1 to 10 hours, in the copper-15% aluminum alloy with water quenching from 900ºC and its effect on hardness, wear resistance, impact resistance and microstructure. Specimens according to ASTM E-10 were used for the hardness test, specimens according to ASTM G-77 for wear test and specimens according to ASTM E-23 for impact test. The results show that hardness, wear resistance and impact resistance increase with increasing tempering time up to 4 hours, and for tempering times greater than 4 hours, hardness, wear resistance and impact resistance decrease up to 10 hours of tempering time. In addition, the values obtained for all levels of tempering time in the copper – 15% aluminum alloy are higher than the alloy in the molten state, and according to wear, this alloy at all levels of tempering time under study is very resistant. Microstructurally, the copper-15% aluminum alloy in the molten state consists of eutectoid phase and gamma phase 2, characteristic of a hypereutectoid casting. The alloy with tempering and tempering up to 4 hours consists of acicular plates of alpha phase (α) in a matrix of tempered martensite (β’) and for times greater than 4 hours up to 10 hours consists of alpha (α) and gamma 2 (γ2). With the tempering time of 4 hours, at 400ºC, the copper – 15% aluminum alloy obtained the best results of the properties under study. The results obtained have been contrasted with an analysis of variance with a confidence level of 95%.
This research has studied the tempering time at 400ºC, in the interval of 1 to 10 hours, in the copper-15% aluminum alloy with water quenching from 900ºC and its effect on hardness, wear resistance, impact resistance and microstructure. Specimens according to ASTM E-10 were used for the hardness test, specimens according to ASTM G-77 for wear test and specimens according to ASTM E-23 for impact test. The results show that hardness, wear resistance and impact resistance increase with increasing tempering time up to 4 hours, and for tempering times greater than 4 hours, hardness, wear resistance and impact resistance decrease up to 10 hours of tempering time. In addition, the values obtained for all levels of tempering time in the copper – 15% aluminum alloy are higher than the alloy in the molten state, and according to wear, this alloy at all levels of tempering time under study is very resistant. Microstructurally, the copper-15% aluminum alloy in the molten state consists of eutectoid phase and gamma phase 2, characteristic of a hypereutectoid casting. The alloy with tempering and tempering up to 4 hours consists of acicular plates of alpha phase (α) in a matrix of tempered martensite (β’) and for times greater than 4 hours up to 10 hours consists of alpha (α) and gamma 2 (γ2). With the tempering time of 4 hours, at 400ºC, the copper – 15% aluminum alloy obtained the best results of the properties under study. The results obtained have been contrasted with an analysis of variance with a confidence level of 95%.
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TECHNOLOGY::Chemical engineering::Metallurgical process and manufacturing engineering::Metallurgical process engineering