激光熔覆Inconel718合金涂层与基体界面的组织及力学性能

An Inconel718 coating was fabricated on the surfaces of Inconel 718 alloy by laser cladding, and the microstructure and mechanics properties in the zones of bonding interfaces were investigated. The results demonstrate that the hardness and strength decrease in the HAZ due to the dissolution of the strengthening phase. Under typical processing conditions, the HAZ decrease with the increasing scanning speeds. There is no planar crystal structures at the bottoms of cladding layers. Furthermore, the structures in the fusion zones were densified and presented smooth transition, the chemical components are consistent with those of the substrate. In the cladding layers, the microstructure consists of an dendritic structure and lots of intergranular Laves phases. The hardness in the cladding layers is higher compared to the HAZ. After the aging heat treatment, the strength in both of HAZs and cladding layers are improved, and are close to that of the substrate materials, and a smooth mechanics properties transition are obtained in the interface zones between the coatings and substrates.