Publication: Influencia de diferentes tratamientos termoquímicos en aceros sinterizados base molibdeno
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2001-04
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Consejo Superior De Investigaciones Científicas (CSIC)
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Abstract
Polvos prealeados de aceros con diferentes contenidos de Mo - Cu - Ni -C se compactaron a 700 MPa y se sinterizaron a 1.120 ºC en atmósfera de 95 % Nz,5 % H2. Después de la sinterización, los materiales se trataron termoquímicamente para su cementación (proceso endogas). Para la caracterización de todos los materiales se realizaron ensayos de compresión del tipo "radial crushing strength", se calculó la densidad y se hizo un completo estudio de las superficies de fracturas a través de microscopía electrónica de barrido. Los resultados de resistencia a compresión muestran, después de la cementación, valores superiores a los encontrados en el estado sinterizado. La superficie de fractura da idea de la fragilidad del material y de la profundidad del tratamiento. En estado sinterizado, se observa una superficie de fractura totalmente dúctil, donde aparecen las características cavidades.
Las superficies de fractura, tras distintos tipos de cementación, reflejan un comportamiento frágil en el exterior, mientras que el interior aparece una mezcla de fractura dúctil con frágil.
Prealloyed steel powders with different amount of Mo-Cu-Ni-C were compacted at 700 MPa and sintered at 1120 °C in 95 % N2-5 % H2. After sinterizing, these materials were treated by carburizing. For materials characterization radial crushing strength were preformed, density was calculated and a complete study of fracture surfaces was carried out using scanning electron microscopy. The results of radial crushing strength show that resistance after carburizing is higher than in sintered materials. The fracture surfaces give an idea of materials briteless and the treatment depth. In sintered materials, a dúctil surface was observed, with the characteristic dimples. The fracture surfaces after different treatments show britelessnes in the outer zone, while inside appears a mix of dúctil and briteles fracture.
Prealloyed steel powders with different amount of Mo-Cu-Ni-C were compacted at 700 MPa and sintered at 1120 °C in 95 % N2-5 % H2. After sinterizing, these materials were treated by carburizing. For materials characterization radial crushing strength were preformed, density was calculated and a complete study of fracture surfaces was carried out using scanning electron microscopy. The results of radial crushing strength show that resistance after carburizing is higher than in sintered materials. The fracture surfaces give an idea of materials briteless and the treatment depth. In sintered materials, a dúctil surface was observed, with the characteristic dimples. The fracture surfaces after different treatments show britelessnes in the outer zone, while inside appears a mix of dúctil and briteles fracture.
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Contribución en: VII Congreso Nacional de Propiedades Mecánicas de Sólidos, Segovia, 27-30 de junio de 2000
Keywords
Sintered, Carburizing
Bibliographic citation
Candela, N., et al. Influencia de diferentes tratamientos termoquímicos en aceros sinterizados base molibdeno = Influence of different thermical treatment in sintered steels base molybdenum. Revista de metalurgia (especial: VII Congreso Nacional de Propiedades Mecánicas de Sólidos), 37(2), Abril 2001, Pp. 115-118