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Effect of Solidification Process Parameters on the Microstructure of Some Meltspun Nickel-Based Hardfacing Alloys

DOI: 10.4236/jmmce.2009.810067, PP. 775-785

Keywords: Alloy, Microstructure, Cooling rate, Ribbon, Wheel velocity

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Abstract:

The influence of solidification parameters on the morphology of a number of meltspun Nickelbased hard alloys has been investigated by means of scanning electron microscopy (SEM), conventional transmission electron microscopy and energy dispersive X-ray analysis (EDXA). It was established that the wheel velocity played a prominent role in the types of microstructure observed. Very high wheel velocity could lead to the formation of amorphous structure as observed in some of the alloys investigated. No appreciable effect of the ribbon thickness was observed on the microhardness of the alloys. It was also reported that the thermal transfer mode between the ideal and newtonian coolings was observed in all the alloys investigated.

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