Wear resistance and hardness of nanostructured hardfacing coatings•

  1. Franklin Paz Triviño 1
  2. Robison Buitrago Sierra 2
  3. Juan Felipe Santa Marín
  1. 1 Tribology and Surfaces Group, Universidad Nacional de Colombia, Medellín, Colombia
  2. 2 Facultad de Ingenierías. Instituto Tecnológico Metropolitano. Medellín-Colombia
Revista:
DYNA: revista de la Facultad de Minas. Universidad Nacional de Colombia. Sede Medellín

ISSN: 0012-7353

Año de publicación: 2020

Volumen: 87

Número: 214

Páginas: 146-154

Tipo: Artículo

DOI: 10.15446/DYNA.V87N214.85683 DIALNET GOOGLE SCHOLAR lock_openDialnet editor

Otras publicaciones en: DYNA: revista de la Facultad de Minas. Universidad Nacional de Colombia. Sede Medellín

Resumen

El desgaste abrasivo es un problema importante en aplicaciones industriales. El desgaste de las herramientas en la industria minera es un problema costoso y reduce el tiempo de funcionamiento de los equipos. En este trabajo se evaluaron recubrimientos soldados de alta resistencia al desgaste obtenidos mediante un proceso manual de arco metálico. La microestructura fue analizada por medio de microscopía óptica y electrónica. Se realizaron pruebas de desgaste ASTM G99 (pin-on-disc) y ASTM G65 (arena seca / rueda de goma), y se inspeccionaron las superficies desgastadas para comprender los mecanismos de desgaste. Los resultados muestran que el recubrimiento tiene una microestructura hipereutéctica compuesta de carburos de austenita del tipo NbC y M7C3. El tamaño de los nanocarburos fue de 91 nm; y el contenido del volumen, 5.3%. Los valores de dureza se encontraron alrededor de 1029 HV200 g, 15 seg.. Se observaron bajas pérdidas de masa en el recubrimiento generadas por la microestructura hipereutéctica. Los principales mecanismos de desgaste fueron la microfractura y desprendimiento de carburos y microcorte en la matriz

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Fuente de los datos: Dialnet