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| With the elevated addition of carbide reinforcements, the ductility of Ni-Based metal matrix composited dropped drastically. Samples fabricated by electron beam melt system, using blend of Inconel 625 and WC powders as raw materials are investigated. In order to find a method to maximize the toughness of such MMCs, several parameters are independently changed during the fabrication. As results, MMCs' ductilities are sensible to parameters such as the scan speed of electron beam. The variance of impact toughness can be up to 50% for MMCs with 30 wt% WC concentration. The sensitivity to parameters drops when the addtion of WC reinforcement increases. The scan speed largely determines the heat input and thus influences the form and the size of melt pool. It has subsequently impacts on the morphology and the types of secondary carbides, degree of dissolution of WC particles, and grain size and growth direction. All factors mentioned above interact, and determine the toughness of sample. The effect of Line offset is also inverstigated. With experimental results, a constructive advice based on an experimental optimized energy density for parameter setting of practical components with large scale was proposed. |
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| Keywords:Composites; EBM; Inconel 625; MMC |
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