Study on Microstructure of Pack-Borided GH4169 Alloy

The structure of the solid pack-boriding layer of nickel-based alloy is studied in this paper. The nickel-based alloy GH4169 was subjected to pack-boriding treatment at 850 °C and 950 °C, and the structure of the alloy boriding layer was studied. After the boriding treatment, a relatively continuous and uniform boriding layer was formed on the surface, which was mainly composed of nickel borides and chromium borides. The sample formed a layered structure of a boriding layer, diffusion zone, and substrate. After boriding treatment, Cr migrated to the surface to form CrB, Cr5B3, and Cr2B chromium borides, while Ni migrated to the lower part of the boriding layer to form Ni2B and Ni3B nickel borides.