<?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>1405-7743</journal-id>
<journal-title><![CDATA[Ingeniería, investigación y tecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. invest. y tecnol.]]></abbrev-journal-title>
<issn>1405-7743</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Ingeniería]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-77432019000200012</article-id>
<article-id pub-id-type="doi">10.22201/fi.25940732e.2019.20n2.024</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of Annealing Temperature on the microstructure of hyperduplex stainless steels]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto de la temperatura de recocido sobre la microestructura de un acero inoxidable hiperduplex]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villalobos-Vera]]></surname>
<given-names><![CDATA[Doris Ivette]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Bravo]]></surname>
<given-names><![CDATA[Ivan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Veracruz  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico de Veracruz  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2019</year>
</pub-date>
<volume>20</volume>
<numero>2</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-77432019000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-77432019000200012&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-77432019000200012&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Samples of hyperduplex stainless steels were produced experimentally and exposed to different conventional annealing heat treatments in order to obtain the microstructural balance of 50% ferrite and 50% austenite. To differentiate the ferrite and austenite from any secondary phase, selective etching was used and quantitative metallography was performed to measure the percentage of phases. Results showed that conventional annealing heat treatments promote the transformation from ferrite to sigma phase and secondary austenite, suggesting a higher occurrence of sigma phase in the experimental hyperduplex alloys compared to other duplex alloys due to the superior content of chromium and molybdenum. On the other hand, a balanced microstructure free of secondary phases was accomplished increasing the temperature of the annealing heat treatment, which allowed the transformation of ferrite into austenite during cooling.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Muestras de acero inoxidable hiperdúplex fueron fabricadas experimentalmente y sometidas a diferentes tratamientos térmicos de recocido para obtener el balance microestructural de 50% ferrita y 50% austenita. Para diferenciar a la ferrita y austenita de fases secundarias, se utilizó un ataque selectivo y se cuantificó el porcentaje de fases mediante metalografía cuantitativa. Los resultados mostraron que los tratamientos térmicos convencionales promueven la transformación de la ferrita a fase sigma y austenita secundaria, sugiriendo una mayor susceptibilidad a la formación de fase sigma en las aleaciones hiperdúplex en comparación con las aleaciones dúplex debido al alto contenido de cromo y molibdeno. Para obtener la microestructura balanceada de ferrita y austenita, se aplicó un tratamiento térmico a mayor temperatura, lo que permitió la transformación de ferrita y austenita sin la formación de fases secundarias.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Hyperduplex stainless steel]]></kwd>
<kwd lng="en"><![CDATA[annealing]]></kwd>
<kwd lng="en"><![CDATA[sigma phase]]></kwd>
<kwd lng="en"><![CDATA[microstructural balance]]></kwd>
<kwd lng="es"><![CDATA[Acero inoxidable hiperdúplex]]></kwd>
<kwd lng="es"><![CDATA[recocido]]></kwd>
<kwd lng="es"><![CDATA[fase sigma]]></kwd>
<kwd lng="es"><![CDATA[balance microestructural]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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