The microstructure of a series of experimental high chromium, high carbon cast irons was examined by optical and electron microscopy to determine the mechanisms that impart their resistance to wear by impact of reduced iron pellets at 550°C. The samples were cast following an experimental design in which the amount of different carbide forming elements was varied. The microstructure of these alloys was found to consist of a primary network of M 7 C 3 carbides surrounded by an austenitic matrix and eutectic carbides. It was found that the size distribution of the proeutectic primary carbide exerts an in uence on wear, but no correlation was found between the hardness of the different constituents and wear. The experimental results indicate that the alloys cast with the greatest amounts of molybdenum showed the lowest resistance to wear. Scanning electron microscopy of a low wear resistant sample showed evidence of the localisation of molybdenum in proeutectic carbides.MST/5170
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