<?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>1815-5944</journal-id>
<journal-title><![CDATA[Ingeniería Mecánica]]></journal-title>
<abbrev-journal-title><![CDATA[Ingeniería Mecánica]]></abbrev-journal-title>
<issn>1815-5944</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería Mecánica. Instituto Superior Politécnico "José Antonio Echeverría"]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1815-59442023000100060</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la temperatura de termofluencia en el acero austenítico refractario HK-40]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of creep temperature on HK-40 refractory austenitic steel]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Columbié]]></surname>
<given-names><![CDATA[Tomás]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez-Torres]]></surname>
<given-names><![CDATA[Ledennis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-González]]></surname>
<given-names><![CDATA[Isnel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán-Romero]]></surname>
<given-names><![CDATA[Elís Efraín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Núñez]]></surname>
<given-names><![CDATA[Miguel Ángel Caraballo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Moa Facultad de Metalurgia y Electromecánica ]]></institution>
<addr-line><![CDATA[Holguín ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Loja Departamento de Mecánica ]]></institution>
<addr-line><![CDATA[Loja ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<volume>26</volume>
<numero>1</numero>
<fpage>60</fpage>
<lpage>67</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1815-59442023000100060&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1815-59442023000100060&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1815-59442023000100060&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El trabajo tuvo como objetivo determinar el efecto de la temperatura de termofluencia en el acero refractario HK-40 empleado en la fabricación de brazos de barridos de hornos de reducción y expuestos a condiciones de termofluencia. Se analizó la zona exterior, la interior y la central del brazo, para determinar las transformaciones estructurales que ocurren según las condiciones de temperaturas a la que está expuesto. Se determinó que, el calor aportado por efecto de la combustión del petróleo y por el calor físico del aire en cámaras de combustión se incrementa de forma gradual y posibilita de falla por termofluencia debido a la acción combinada de esfuerzo y calor. La microestructura del acero HK-40 en las tres zonas a 760 °C, es de una matriz austenítica con carburos M23C6 en los límites de los granos, sin estructura dendrítica y una banda de austenita descromizada rodeada de carburos primarios (eutécticos), que provoca la fragilidad e induce la falla, la presencia de grieta en la zona exterior del brazo ocurrió en un área prevista de posibles carburos]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The work aimed to determine the effect of creep temperature on HK-40 refractory steel used in the manufacture of sweeping arms of reduction furnaces and exposed to creep conditions. The exterior, interior and central zone of the arm were analyzed to determine the structural transformations that occur according to the temperature conditions to which it is exposed. It was determined that the heat provided by the effect of the combustion of oil and by the physical heat of the air in combustion chambers increases gradually and enables failure by creep due to the combined action of stress and heat. The microstructure of HK-40 steel in the three zones at 760 °C, is an austenitic matrix with M23C6 carbides at the grain boundaries, without dendritic structureand a band of dechromed austenite surrounded by primary carbides (eutectic), which causes brittleness and induces failure, the presence of crack in the outer area of the arm occurred in an area foreseen of possible carbides.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[efecto de la temperatura de termofluencia]]></kwd>
<kwd lng="es"><![CDATA[límites de los granos]]></kwd>
<kwd lng="es"><![CDATA[carburos M23C6]]></kwd>
<kwd lng="es"><![CDATA[grietas]]></kwd>
<kwd lng="es"><![CDATA[acero austenítico refractario HK-40]]></kwd>
<kwd lng="en"><![CDATA[effect of creep temperature]]></kwd>
<kwd lng="en"><![CDATA[grain boundaries]]></kwd>
<kwd lng="en"><![CDATA[carbides M23C6, cracks]]></kwd>
<kwd lng="en"><![CDATA[HK-40 refractory austenitic steel.]]></kwd>
</kwd-group>
</article-meta>
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