A method for refining a nickel-based superalloy powder

Abstract

The present application belongs to the field of metal material recycling and green metallurgy technology, and particularly relates to a method for refining steel liquid with nickel-based high-temperature alloy coarse powder. The present application uses a compact formed by mixing nickel-based high-temperature alloy coarse powder, reducing agent and flux as the inner core, uses Ni-Cr alloy as the intermediate layer, and uses low-carbon steel as the outer layer to form an alloy package with a three-layer core-shell structure. Through the synergistic design of the Ni-based solvent phase and the three-layer core-shell structure, the alloy package realizes time sequence melting after being put into the steel liquid, the outer layer steel delays melting to protect the inner core from deepening into the steel liquid, the inner core Ni-based solvent phase melts first to form a rich Ni liquid diffusion channel, significantly reduces the oxidation barrier of alloying elements, the intermediate layer improves wettability, promotes the rapid and uniform dissolution of alloying elements in the steel liquid, realizes the total yield of alloying elements ≥ 95%, and the effective dissolution time < 5 minutes, thereby solving the problems of low alloying efficiency and large composition fluctuation when the nickel-based coarse powder directly recycled from additive manufacturing is used in steel metallurgy.