TiC添加量对激光增材制造MC碳化物增强Inconel625复合材料组织及性能的影响

The MC carbide reinforced Inconel625 composites are prepared by the laser additive manufacturing technology, and the effects of TiC addition mass on the microstructures, micro-hardness and wear properties of the composites are investigated. The results show that the microstructure of composite with the addition of TiC is composed of dendritic γ matrix and interdendritic reinforcements with a dispersive distribution. With the increase of TiC addition, the primary dendritic spacing of the composites decreases, while the content of MC carbide as well as the micro-hardness increases gradually. The wear resistance properties of all the composites are improved by over 80%. When the TiC has a mass fraction of 1%, the yield strength and tensile strength of the composites are increased by 21.9% and 27.5%, respectively, but their elongation is reduced.