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Vol. 31 No. 60 (2022)
April-June 2022 (Continuous Publication)

Papers

Solid-State and Super Solidus Liquid Phase Sintering of 4340 Steel SLM Powders Shaped by Fused Filament Fabrication

https://doi.org/10.19053/01211129.v31.n60.2022.13913

Published 2022-05-21

Andres-Fernando Gil-Plazas
Servicio Nacional de Aprendizaje

Julián-David Rubiano-Buitrago
Universidad Nacional de Colombia

Luis-Alejandro Boyacá-Mendivelso
Universidad Nacional de Colombia

Liz-Karen Herrera-Quintero
Universidad Nacional de Colombia

Abstract

4340 steel powders were processed with an additive manufacturing process using the FFF (Fused Filament Fabrication) technique. A composite filament was developed to print samples and study the effect of the bed and nozzle temperatures on its physical and microstructural properties. The printed samples were debinded and sintered by: Solid State (SS) at 1300 °C or SLPS (Supersolidus Liquid Phase Sintering) at 1420 °C. Metallography and scanning electron microscopy (SEM) identified the microstructure and phases. The hardness of the sintered samples was measured with the Vickers method. The SLPS process contributes to better densification and volume contraction; however, it promotes geometrical distortion of the samples compared to the SS samples. The microstructure of the sintered samples consists of ferrite situated in the original austenite grain and bainite. The sintering mechanism significantly influenced the hardness of the samples. Finally, a part was designed, printed, debinded, and sintered with the aim of studying the maximum inclination angle, the minimum vertical and horizontal holes, and the minimum vertical layer thickness, which can be obtained through the whole process.

Keywords

Additive manufacturing, 4340 steel, debinding, sintering, characterization, fused filament fabrication

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Author Biography

Andres-Fernando Gil-Plazas

Roles: Conceptualization, Research, Methodology, Writing - Original draft, Writing – Review & editing.

Julián-David Rubiano-Buitrago

Roles: Conceptualization, Research, Methodology, Writing - Original draft, Writing – Review & editing.

Luis-Alejandro Boyacá-Mendivelso

Roles: Conceptualization, Visualization.

Liz-Karen Herrera-Quintero

Roles: Conceptualization, Supervision.

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