Microstructural Evolution of In Situ (Fe,Cr)7C3 Particles Reinforced Iron Matrix Composites

Li Bin Niu; Jing Lai Tian; Xiao Gang Wang

doi:10.4028/www.scientific.net/AMR.503-504.408

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Microstructural Evolution of In Situ (Fe,Cr)₇C₃ Particles Reinforced Iron Matrix Composites

Abstract:

A kind of (Fe,Cr)₇C₃particles reinforced iron matrix composite was prepared by metallurgical bonding between Cr wires and gray cast iron at 1200°C with subsequent heat treatment. The obtained composites were comparatively characterized by XRD, SEM and microhardness tests. The results showed that the composites mainly consisted of α-Fe matrix and the reinforcements of particle bundles, which include (Fe,Cr)₇C₃ carbides and γ-Fe. The cross-section of the reinforcements gradually increase with heat treatment time, and the microstructures change from eutectic to hypoeutectic, the morphologies of the reinforcements present chrysanthemum-shaped, granular and intercrystalline eutectics.