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

Moreira, Aida B. ; Ribeiro, Laura M. M. ; Lacerda, Pedro ; Pinto, Ana M. P. ; Vieira, Manuel F.

Materials, 2022-09, Vol.15 (18), p.6199 [Periódico revisado por pares]

Basel: MDPI AG

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Título:
A Study on a Cast Steel Reinforced with WC–Metal Matrix Composite
Autor: Moreira, Aida B. ; Ribeiro, Laura M. M. ; Lacerda, Pedro ; Pinto, Ana M. P. ; Vieira, Manuel F.
Assuntos: Abrasion ; Alloy steels ; Alloys ; Base metal ; Carbon steel ; casting ; Cratering ; Electron backscatter diffraction ; ex situ technique ; Hardness ; Liquid metals ; local reinforcement ; Low carbon steel ; Low carbon steels ; Martensite ; Mechanical properties ; Metal castings ; metal matrix composite ; Metal matrix composites ; Microstructure ; Precipitates ; Reinforcement ; Scanning electron microscopy ; Tungsten carbide ; Wear rate
É parte de: Materials, 2022-09, Vol.15 (18), p.6199
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: 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)6C carbides. Closer to the base metal, dendritic eutectic carbides of (Fe,W)6C and fine (Fe,W)23C6 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.
Editor: Basel: MDPI AG
Idioma: Inglês

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

Moreira, Aida B. ; Ribeiro, Laura M. M. ; Lacerda, Pedro ; Pinto, Ana M. P. ; Vieira, Manuel F.

Basel: MDPI AG

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