<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0121-1129</journal-id>
<journal-title><![CDATA[Revista Facultad de Ingeniería]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. ing.]]></abbrev-journal-title>
<issn>0121-1129</issn>
<publisher>
<publisher-name><![CDATA[Universidad Pedagógica y Tecnológica de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-11292022000200201</article-id>
<article-id pub-id-type="doi">10.19053/01211129.v31.n60.2022.13913</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Solid-State and Super Solidus Liquid Phase Sintering of 4340 Steel SLM Powders Shaped by Fused Filament Fabrication]]></article-title>
<article-title xml:lang="es"><![CDATA[Sinterización en fase líquida super solidus y de estado sólido de polvos SLM de acero 4340 formados por fabricación de filamentos fundidos]]></article-title>
<article-title xml:lang="pt"><![CDATA[Sinterização em fase líquida super solidus e estado sólido de pós SLM de aço 4340 formados pela fabricação de filamentos fundidos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gil-Plazas]]></surname>
<given-names><![CDATA[Andres-Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rubiano-Buitrago]]></surname>
<given-names><![CDATA[Julián-David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Boyacá-Mendivelso]]></surname>
<given-names><![CDATA[Luis-Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera-Quintero]]></surname>
<given-names><![CDATA[Liz-Karen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Servicio Nacional de Aprendizaje  ]]></institution>
<addr-line><![CDATA[Bogotá Distrito Capital]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá Distrito Capital]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>31</volume>
<numero>60</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-11292022000200201&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-11292022000200201&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-11292022000200201&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[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.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[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.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Pós de aço 4340 foi processado por manufatura aditiva utilizando a técnica FFF (Fused Filament Fabrication). Um filamento compósito foi desenvolvido para imprimir amostras e estudar o efeito da cama de impressão e da temperatura do bico em suas propriedades físicas e microestruturais. As amostras impressas foram despolimerizadas e sinterizadas em estado sólido (Solid State - SS) a 1300 °C e sinterização em fase líquida super solidus (Supersolidus Liquid Phase Sintering -SLPS) a 1420 °C. Por metalografia e microscopia eletrônica de varredura (SEM) a microestrutura e as fases presentes foram identificadas. A dureza das amostras sinterizadas foi medida pelo método de Vickers. O processo SLPS contribui para uma melhor densificação e retração volumétrica; porém, promove distorção geométrica das amostras em relação às amostras SS. A microestrutura das amostras sinterizadas consiste em ferrita de contorno de grão austenítico original e bainita. O mecanismo de sinterização influenciou significativamente na dureza das amostras. Por fim, uma peça foi projetada, impressa, despolimerizada e sinterizada para estudar o ângulo de inclinação máximo, os furos verticais e horizontais mínimos e a espessura mínima da camada vertical, que pode ser obtida ao longo de todo o processo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[4340 steel]]></kwd>
<kwd lng="en"><![CDATA[additive manufacturing]]></kwd>
<kwd lng="en"><![CDATA[characterization]]></kwd>
<kwd lng="en"><![CDATA[debinding]]></kwd>
<kwd lng="en"><![CDATA[fused filament fabrication]]></kwd>
<kwd lng="en"><![CDATA[sintering]]></kwd>
<kwd lng="es"><![CDATA[acero 4340]]></kwd>
<kwd lng="es"><![CDATA[caracterización]]></kwd>
<kwd lng="es"><![CDATA[despolimerizado]]></kwd>
<kwd lng="es"><![CDATA[fabricación de filamentos fundidos]]></kwd>
<kwd lng="es"><![CDATA[manufactura aditiva]]></kwd>
<kwd lng="es"><![CDATA[sinterización]]></kwd>
<kwd lng="pt"><![CDATA[aço 4340]]></kwd>
<kwd lng="pt"><![CDATA[caracterização]]></kwd>
<kwd lng="pt"><![CDATA[despolimerização]]></kwd>
<kwd lng="pt"><![CDATA[fabricação de filamentos fundidos]]></kwd>
<kwd lng="pt"><![CDATA[manufatura aditiva]]></kwd>
<kwd lng="pt"><![CDATA[sinterização]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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