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Preparation and microstructural characterization of a high-Cr white cast iron reinforced with WC particles

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Resumo:High-chromium white cast iron (WCI) specimens locally reinforced with WC–metal matrix composites were produced via an ex situ technique: powder mixtures of WC and Fe cold-pressed in a pre-form were inserted in the mold cavity before pouring the base metal. The microstructure of the resulting reinforcement is a matrix of martensite (α’) and austenite (γ) with WC particles evenly distributed and (Fe,W,Cr)<sub>6</sub>C carbides that are formed from the reaction between the molten metal and the inserted pre-form. The (Fe,W,Cr)<sub>6</sub>C precipitation leads to the hypoeutectic solidification of the matrix and the final microstructure consists of martensite, formed from primary austenite during cooling and eutectic constituent with (Fe,Cr)<sub>7</sub>C<sub>3</sub> and (Fe,W,Cr)<sub>6</sub>C carbides. The presence of a reaction zone with 200 µm of thickness, between the base metal and the composite should guarantee a strong bonding between these two zones.
Autores principais:Moreira, Aida B.
Outros Autores:Ribeiro, Laura M. M.; Lacerda, Pedro; Sousa, Ricardo O.; Pinto, A. M. P.; Vieira, Manuel F.
Assunto:high-chromium white cast iron ex situ technique local reinforcement metal matrix composite microstructural characterization tungsten carbide
Ano:2020
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho

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