Abstract
The formation mechanism of the surface and cross-sectional morphology of the TiC particles planted on single crystal superalloy by the electrospark discharging process, as well as the effect of pulse energy on the microstructure and shear force of the planted particles were investigated. The results show that, the surface of the planted particles can be categorized as 3 regions: spreading region, flushing region and oxidation region. The cross sectional microstructure is formed by 3 synergistic processes: the electrospark discharging process, the particle breakage process, and electro-capillary rise process. Because of these processes, micro-cracks and merged pores are formed in the particle, which are quickly filled with the molten substrate metal, resulting in the element interdiffusion and metallurgical bonding between TiC particles and the metal substrate. With increasing pulse energy, the effect of these processes on the surface and cross-sectional morphology is changed, leading to the change of shear force.
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