Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1605796 | Journal of Alloys and Compounds | 2016 | 7 Pages |
•Electron beam smelting, a new method, was used to prepare the Inconel 740 superalloy.•The EBS 740 shows higher strengthening effect than 740 made in traditional method.•The EBS 740 shows better oxidation resistance than traditional 740.•It shows application prospect of EBS technology in preparing Ni-base superalloys.
A novel method, namely electron beam smelting (EBS) technology was used to prepare the Inconel 740 superalloy. The microstructures, hardness and oxidation behavior were characterized and compared with the traditionally prepared Inconel 740 superalloy. The results imply that the solution treatment gives rise to the coarsening of γ′ precipitates, with further aging treatment, the γ′ precipitates with size of less than 30 nm are distributed dispersively in the matrix, leading to a decreasing of the lattice parameters and an increasing of the misfit. The γ′ precipitates result in shearing mechanism of weakly pair coupling. The EBS 740 superalloy produces better properties than that prepared in the traditional method in both precipitation strengthening effect and oxidation resistance.