A Study on a Cast Steel Reinforced with WC-Metal Matrix Composite

• Tipo: Artigo em Revista Científica Internacional
• Data: 2022

Autores

Moreira, AB (Autor) FEUP; Laura Ribeiro (Autor) FEUP; Lacerda, P (Autor) Outra; Pinto, AMP (Autor) Outra; Vieira, MF (Autor) FEUP

Revista

Título: Materials

Vol. 15

Página Final: 6199

ISSN: 1996-1944

Editora: MDPI

Indexação

ISI Web of Knowledge - 0 Citações

Scopus

Outras Informações

ID Authenticus: P-00X-4R5

DOI: 10.3390/ma15186199

Abstract (EN): This study seeks to investigate the local reinforcement of low carbon cast steel specimens with WC-metal matrix composites (WC-MMCs), to obtain a new material effective in competing with hard alloy steels. For this purpose, a powder compact of tungsten carbide (WC) and iron (Fe) was prepared and placed in the mold cavity before casting. The reactions that occurred with the molten steel led to the formation of the WC-MMC and, consequently, to the local reinforcement of the steel. The microstructure of the WC-MMC reinforcement was characterized by scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and electron backscatter diffraction (EBSD). The results showed a microstructural variation throughout the depth of the reinforcement. In the surface region, most of the original WC particles retain their polygonal morphology, but towards the base metal, the dissolution of the WC particles increased with the formation of (Fe,W)(6)C carbides. Closer to the base metal, dendritic eutectic carbides of (Fe,W)(6)C and fine (Fe,W)(23)C-6 precipitates in a matrix of martensite were formed. The mechanical properties of the reinforcement were evaluated by hardness and ball-cratering abrasion tests. The results revealed a significant increase in hardness, being three times harder than the base metal, and a decrease of 39% in the wear rate.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11