7th IMRMPT

Abstract

Abstract information

English title:	Electrochemical hydrogen charging of microalloying steels for sour service applications
Spanish title:	Carga electroqu�mica de hidr�geno en aceros microaleados para aplicaciones sour service
English abstract:	The aim of this study is to characterize the resistance to hydrogen-induced cracking of two microalloyed X65 grade steels with different Mn contents, which were developed for sour service applications. This study opens up a new perspective for the use of these materials in reservoirs with high levels of hydrogen sulfide (Ultra-sour service). Two pipelines made of X65 grade steel were studied, one with low Mn content and high Nb, and a commercial steel. The hydrogen-induced cracking resistance was evaluated according to the NACE TM0284-11 standard in Solution A to confirm its suitability for sour service applications. To increase the aggressiveness of the cracking test, electrochemical hydrogen charging was carried out in a NACE Solution A saturated with H2S, applying different current densities. The microstructural and morphological characterization of the cracking was carried out using optical microscopy (OM), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) analysis to identify the non-metallic inclusions. Both steels did not show cracks when tested according to the NACE TM0284-11 standard. The steel with low Mn content and high Nb did not show cracks after electrochemical charging at any of the current densities used, while the commercial X65 steel showed cracks that increased in size with the increase in current densities used in hydrogen electrochemical loading, reaching a maximum value of 7,5 mA/cm2. The steels with low Mn content and high Nb did not show cracks in hydrogen electrochemical loading tests. This behavior was attributed to the refined microstructure with high ductility and the presence of homogeneously distributed nanometric precipitates.
Spanish abstract:	El objetivo de este estudio consiste en caracterizar la resistencia a la fractura por hidr�geno en dos aceros micro aleados grado X65 con diferentes contenidos de Mn, desarrollados para aplicaciones sour service, abriendo una nueva visi�n para las aplicaciones de estos materiales en yacimientos con altos niveles de sulfuro de hidr�geno (Ultra sour service). Se estudiaron dos tubos de acero microaleados grado X65, uno de bajo contenido en Mn y alto Nb y un acero comercial. Fue evaluada la resistencia al agrietamiento de acuerdo a la norma NACE TM0284-11 en la soluci�n A, con el fin de confirmar su aplicaci�n sour service. Para aumentar la agresividad del ensayo de agrietamiento fue realizada carga electroqu�mica en la soluci�n A saturada con H2S, aplicando diferentes densidades de corriente. Una vez finalizados los ensayos, se realiz� la caracterizaci�n microestructural y morfol�gica del agrietamiento mediante microscopio �ptico (OM), microscopio electr�nico de barrido (SEM) y an�lisis por espectroscop�a de dispersi�n de energ�a (EDS) para caracterizar las inclusiones. Los dos aceros no presentaron grietas al ser sometidos al ensayo de la norma NACE TM0284-11. El acero con bajo contenido de Mn y alto Nb no presenta grietas despu�s de la carga electroqu�mica en ninguna de las densidades de corriente utilizadas, Ya el acero comercial X65 present� grietas que aumentaban en tama�o con el aumento de las densidades de corriente utilizadas en la carga electroqu�mica de hidr�geno, llegando a un m�ximo en valor de 8 mA/cm2. Los aceros con bajo contenido de Mn y alto de Nb no mostraron grietas en las pruebas de carga electroqu�mica de hidr�geno. Este comportamiento se atribuy� a la microestructura refinada con buena ductilidad y la presencia de precipitados nanom�tricos distribuidos homog�neamente.
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Authors

Name	Institution	Email
Duberney Hincapi� Ladino	Fundaci�n Universidad de Am�rica	duberney.hincapie@profesores.uamerica.edu.co
Jos� Wilmar Calder�n	Corporaci�n Universitaria Remington	jose.calderon01@uniremington.edu.do
Jefferson Salamanca	Universidad ECCI	jsalamancacar@ecci.edu.do
Leydi Julieta Cardenas Flechas	Fundaci�n Universidad de Am�rica	leydi.cardenas@profesores.uamerica.edu.co
Hercilio Gomes De Melo	Universidad de Sao paulo	hgdemelo@usp.br

Presentation

Room:	Principal Room
Date:	June 8, 2023
Hour:	11:20 - 11:40

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7^th IMRMPT
Seventh International Meeting for Researchers in Materials and Plasma Technology

Previous editions:

        1st IMRMPT 2011
        2nd IMRMPT 2013
        3rd IMRMPT 2015
        4th IMRMPT 2017
        5th IMRMPT 2019
        5+1 IMRMPT 2021

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