Efecto del V y el Si Sobre la Microestructura de Depósitos Realizados con Electrodos Tubulares Revestidos de Alto Contenido de Mn (Hadfield)

Abstract

Este es un artículo publicado en acceso (Open Access) abierto bajo la licencia Creative Commons Attribution NonCommercial, que permite su uso, distribución y reproducción en cualquier medio, sin restricciones siempre que sin fines comerciales y que el trabajo original sea debidamente citado. Resumen: Las aleaciones para el relleno superficial Fe-Mn-C (Hadfield) han demostrado una excelente resistencia al desgaste bajo altas cargas dinámicas. En los últimos años se han realizado numerosos estudios para aumentar la resistencia al desgaste y mejorar su desempeño, a través de la introducción de otros elementos de aleación. En el presente trabajo se investiga la microestructura y dureza de los depósitos de relleno con alto contenido de Mn y adiciones de 1.2% de V y 2.4% de Si. Los depósitos estudiados se realizaron utilizando electrodos tubulares revestidos fabricados a escala de laboratorio. Las fases y microconstituyentes en el metal depositado se identificaron mediante microscopía óptica (MO), electrónica de barrido (MEB), difracción de rayos X (DRX), dureza y microdureza. De acuerdo a los resultados obtenidos, la adición de V al sistema aleante originó que la fase predominante fuera la austenita. Además, contribuyó a la formación de carburos de vanadio (VC) en la microestructura de la capa de relleno, sin observarse la presencia de carburos complejos. Por otra parte, la presencia de Si favoreció la formación de una red de ferrita interdendrítica. La adición de estos elementos de aleación mejoró las propiedades de estos depósitos, potencializando su uso en aplicaciones que requieren alta resistencia al desgaste bajo altas cargas. Palabras-clave:Hadfield; Microestructura; Relleno; Vanadio; Silicio. Effect of V and Si on the Microstructure of Deposits Welded Using Tubular Coated Electrodes with High Mn Content (Hadfield)Abstract: Fe-Mn-C (Hadfield) alloys for surfacing weld deposits have demonstrated excellent wear resistance under high dynamic loads. In recent years, numerous studies have been conducted to improve their wear resistance and performance through the introduction of others alloying elements. In the present work, microstructure and hardness of high Mn surfacing welds with 1.2% V and 2.4% Si additions were investigated. The surfacing welds were deposited using experimental tubular coated electrodes. Phases and micro constituents in the resulting deposits were identified using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), hardness and micro hardness. Based on the obtained results, V additions to the alloy led to the formation of austenite as predominant phase. Besides, contributed to the formation of vanadium carbides (VC), without the presence of complex carbides. Otherwise, Si addition favored the formation of an interdendritical ferrite network. The addition of these elements favored the increase in the properties of the weld deposits, potentializing their use in applications that require high wear resistance under high loads.

Forming the structure and the properties of electric arc coatings based on high manganese steel alloyed with titanium and niobium carbides

“…Ключовi [6,7]. Electrode materials of the Fe-Mn-C system demonstrate high performance under working conditions when there are significant dynamic loadings and are widely used in strengthening the parts of earthmoving equipment, milling facilities, mining equipment, etc.…”

“…The hardness of serial coatings after hardfacing is ~21-25 HRC and after the operation at impact loads ~45 HRC. An increase in wear resistance of such coatings can be achieved by insignificant ~1.2 % by mass of V [6], which ensures an increase in initial hardness up to 35 HRC. In paper [7], the effect of alloying on hardness and impact wear resistance of electric arc coatings based on the Fe-Mn-C system was studied.…”

“…7) shows that the use of ferro silicomanganese (E1 material) in the charge enables obtaining the coating with almost similar level of properties. Additional alloying of the charge with Ti and Nb carbides leads to a significant increase in hardness both in the welded (12-13 HRC), and deformed state (6)(7)(8). This increase in hardness due to the appearance of carbide phases in the structure leads to a natural increase in abrasive wear resistance by 1.6-1.8 times.…”