Sinterización en fase líquida super solidus y de estado sólido de polvos SLM de acero 4340 formados por fabricación de filamentos fundidos
Resumen
Polvo de acero 4340 fue procesado mediante manufactura aditiva utilizando la técnica FFF (Fused Filament Fabrication). Se desarrolló un filamento compuesto para imprimir muestras y estudiar el efecto de la temperatura de la cama y de la boquilla de impresión en sus propiedades físicas y microestructurales. Las muestras impresas fueron despolimerizadas y sinterizadas en estado sólido (Solid State - SS) a 1300 °C y sinterización en fase líquida super solidus (Supersolidus Liquid Phase Sintering -SLPS) a 1420 °C. Por metalografía y microscopía electrónica de barrido (SEM) se identificó la microestructura y las fases presentes. La dureza de las muestras sinterizadas se midió con el método Vickers. El proceso SLPS contribuye a una mejor densificación y contracción volumétrica; sin embargo, promueve distorsión geométrica de las muestras en comparación con las muestras SS. La microestructura de las muestras sinterizadas consiste en ferrita situada en el límite de grano austenítico original y bainita. El mecanismo de sinterización influyó significativamente en la dureza de las muestras. Finalmente, se diseñó, imprimió, despolimerizó y sinterizó una pieza con el objetivo de estudiar el ángulo máximo de inclinación, los mínimos agujeros verticales y horizontales, y el mínimo espesor de capa vertical, que se pueden obtener a lo largo de todo el proceso.
Palabras clave
acero 4340, caracterización, despolimerizado, fabricación de filamentos fundidos, manufactura aditiva, sinterización
Biografía del autor/a
Andres-Fernando Gil-Plazas
Roles: Conceptualización, Investigación, Metodología, Escritura - Borrador original, Escritura – Revisión y Edición.
Julián-David Rubiano-Buitrago
Roles: Conceptualización, Investigación, Metodología, Escritura - Borrador original, Escritura – Revisión y Edición.
Luis-Alejandro Boyacá-Mendivelso
Roles: Conceptualización, Visualización.
Liz-Karen Herrera-Quintero
Roles: Conceptualización, Supervisión.
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