<?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>S1405-77432017000200193</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Microstructural Transformation in the Root Pass of Superduplex Stainless Steel Multipass Welding]]></article-title>
<article-title xml:lang="es"><![CDATA[Transformación microstructural en el paso de raíz de una soldadura multipasos de acero inoxidable superdúplex]]></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 Departamento de Metal-Mecánica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico de Veracruz Departamento de Metal-Mecánica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<volume>18</volume>
<numero>2</numero>
<fpage>193</fpage>
<lpage>198</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-77432017000200193&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-77432017000200193&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-77432017000200193&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This work focuses on the identification of secondary phases in a superduplex stainless steel multipass welding performed by means of the GMAW process using two filler metals, one of the duplex type and the other of the superduplex type. To identify the secondary phases in the welding metal and the heat affected zone, the samples were analyzed by optical microscopy. The results showed a considerable formation of sigma phase in the welding metal in both samples, making evident the total consumption of ferrite. On the other hand, the heat affected zone corresponding to the superduplex-type filler metal, presents a remarkable sensitization, probably due to the occurrence of chromium nitrides in the center of the ferrite grains while the heat affected zone corresponding to the duplex-type filler metal depicts a more balanced microstructure of ferrite, austenite and secondary austenite.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Este trabajo se centra en la identificación de las fases secundarias en una soldadura multipasos de acero inoxidable superdúplex realizada mediante el proceso GMAW, empleando dos metales de aporte, uno de tipo dúplex y el otro de tipo superdúplex. Para identificar las fases secundarias en el metal de soldadura y la zona afectada térmicamente, las muestras se analizaron por microscopía óptica. Los resultados mostraron una formación considerable de fase sigma en el metal de soldadura en ambas muestras, haciendo evidente el consumo total de la fase ferrita. Por otra parte, la zona afectada térmicamente correspondiente a la unión con metal de aporte del tipo superdúplex, presenta una sensibilización notable probablemente debido a la incurrencia de nitruros de cromo en el centro del grano ferrítico, mientras que la zona afectada térmicamente que corresponde a la unión con el metal de aporte del tipo dúplex, presenta una microestructura más equilibrada de ferrita, austenita y austenita secundaria.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[thermal cycle]]></kwd>
<kwd lng="en"><![CDATA[superduplex stainless steel]]></kwd>
<kwd lng="en"><![CDATA[sigma phase]]></kwd>
<kwd lng="en"><![CDATA[welding]]></kwd>
<kwd lng="en"><![CDATA[GMAW]]></kwd>
<kwd lng="en"><![CDATA[heat affected zone]]></kwd>
<kwd lng="en"><![CDATA[welding metal]]></kwd>
<kwd lng="es"><![CDATA[ciclo térmico]]></kwd>
<kwd lng="es"><![CDATA[acero inoxidable superdúplex]]></kwd>
<kwd lng="es"><![CDATA[fase sigma]]></kwd>
<kwd lng="es"><![CDATA[soldadura]]></kwd>
<kwd lng="es"><![CDATA[GMAW]]></kwd>
<kwd lng="es"><![CDATA[zona afectada térmicamente]]></kwd>
<kwd lng="es"><![CDATA[metal de soldadura]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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