采用激光立体成形技术制备了K465镍基高温合金试样,研究了晶粒、γ′强化相及碳化物等组织的特征及演化规律。结果表明:试样中心区域内晶粒粗大,顶部边缘区域晶粒细小;试样内枝晶呈现明显的沿沉积方向外延生长特点,在接近试样底部的部分,熔覆层顶部由于重熔不完全而出现转向枝晶区;熔覆层交界处的γ′相尺寸略大于层内的γ′相,枝晶间的γ′相尺寸略大于枝晶干上的γ′相;MC碳化物呈现多种形貌,底部存在分叉发达的花瓣状MC碳化物,中部有较多短棒状MC碳化物,顶部存在棒状和八面体状的MC碳化物。 K465 Ni-based superalloy samples were prepared by laser three-dimensional forming technology. The characteristics and evolution of grains, γ ’strengthening phases and carbides were studied. The results show that the grains in the central region of the sample are coarse and the grains in the top edge region are small. The inner dendrites show obvious epitaxial growth along the deposition direction. In the part near the bottom of the sample, Completely turned to the dendrite zone; the γ ’phase size at the interface of the cladding layer was slightly larger than the γ’ phase in the layer, and the γ ’phase size between the dendrites was slightly larger than that on the dendrites; the MC carbide appeared A variety of morphology, the existence of the bottom of the well developed petaloid MC carbide, the middle of more short rod MC carbide, the top of the presence of rod-shaped and octahedral MC carbide.