<?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>0012-7353</journal-id>
<journal-title><![CDATA[DYNA]]></journal-title>
<abbrev-journal-title><![CDATA[Dyna rev.fac.nac.minas]]></abbrev-journal-title>
<issn>0012-7353</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0012-73532020000300146</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v87n214.85683</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Wear resistance and hardness of nanostructured hardfacing coatings]]></article-title>
<article-title xml:lang="es"><![CDATA[Resistencia al desgaste y dureza de recubrimientos por soldadura nanoestructurados]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paz-Triviño]]></surname>
<given-names><![CDATA[Franklin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Buitrago-Sierra]]></surname>
<given-names><![CDATA[Robison]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santa-Marín]]></surname>
<given-names><![CDATA[Juan Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico Metropolitano  ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>87</volume>
<numero>214</numero>
<fpage>146</fpage>
<lpage>154</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532020000300146&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532020000300146&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532020000300146&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Abrasive wear is an important problem in industrial applications. The wear of tools in the mining industry is a costly issue, and it reduces equipment uptime. This study examined welded coatings obtained using a manual metal arc process with improved wear resistance. Their microstructure was studied by optical and electron microscopy. ASTM G99 (pin-on-disc) and ASTM G65 (dry sand/rubber wheel) wear tests were performed, and the worn surfaces were inspected to understand the wear mechanisms. The results show that the coating has a hypereutectic microstructure composed of austenite, NbC, and M7C3 carbides. The size of the nanocarbides was 91 nm; and the volume content, 5.3%. Hardness values were found around 1029 HV200 g, 15 seg. Low values of mass losses were attributed to the hypereutectic nanostructured hardfacing coating with extremely high hardness. The main wear mechanisms were microfracture and detachment of carbides and microcutting on the matrix.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El desgaste abrasivo es un problema importante en aplicaciones industriales. El desgaste de las herramientas en la industria minera es un problema costoso y reduce el tiempo de funcionamiento de los equipos. En este trabajo se evaluaron recubrimientos soldados de alta resistencia al desgaste obtenidos mediante un proceso manual de arco metálico. La microestructura fue analizada por medio de microscopía óptica y electrónica. Se realizaron pruebas de desgaste ASTM G99 (pin-on-disc) y ASTM G65 (arena seca / rueda de goma), y se inspeccionaron las superficies desgastadas para comprender los mecanismos de desgaste. Los resultados muestran que el recubrimiento tiene una microestructura hipereutéctica compuesta de carburos de austenita del tipo NbC y M7C3. El tamaño de los nanocarburos fue de 91 nm; y el contenido del volumen, 5.3%. Los valores de dureza se encontraron alrededor de 1029 HV200 g, 15 seg.. Se observaron bajas pérdidas de masa en el recubrimiento generadas por la microestructura hipereutéctica. Los principales mecanismos de desgaste fueron la microfractura y desprendimiento de carburos y microcorte en la matriz.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[nanostructured]]></kwd>
<kwd lng="en"><![CDATA[hardfacing]]></kwd>
<kwd lng="en"><![CDATA[abrasion]]></kwd>
<kwd lng="en"><![CDATA[hypereutectic]]></kwd>
<kwd lng="es"><![CDATA[nanoestructurados]]></kwd>
<kwd lng="es"><![CDATA[recubrimientos duros]]></kwd>
<kwd lng="es"><![CDATA[abrasión, hipereutécticos]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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