Investigation on Microstructure and Interfaces in Graded FE50007 / WC Composites Produced by Casting

Leibholz, Rodolfo; Leibholz, Henrique; Bayraktar, E.; Robert, Maria Helena

doi:10.1007/978-3-319-95510-0_43

Cited by 1 publication

(1 citation statement)

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“…In the liquid-state technique, the molten metal infiltrates through compacted ceramic particles, previously placed in the mold cavity, reacting with it and producing a metal matrix composite. The process can be done by pressureless infiltration (spontaneous or reactive infiltration) [11,12,14,15,[24][25][26] or by pressure-driven infiltration (squeeze casting, vacuum pressure casting, centrifugal casting) [13,16,20,[27][28][29][30][31][32][33][34][35][36][37][38][39]. The major advantage of the liquid-state process is the possibility of producing products with complex geometry and parts with a surface reinforcement whereas higher wear resistance is needed [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Microstructural Characterization of a High-Cr White Cast Iron Reinforced with WC Particles

et al. 2020

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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)6C carbides that are formed from the reaction between the molten metal and the inserted pre-form. The (Fe,W,Cr)6C 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)7C3 and (Fe,W,Cr)6C 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.

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