ELECTROSLAG CRUCIBLE REMELTING for IN-HOUSE RECYCLING HEAVILY CONTAMINATED SCRAP of Ni-BASE SUPERALLOYS

摘要

Generation of the significant amount of the scrap contaminated by detrimental admixtures is common for the manufacturing of the nickel-base superalloy components. The analysis of the current technologies for the scrap recycling has demonstrated their complicity and expensiveness. The majority of valuable alloying elements with strong affinity for oxygen are irreversibly lost. Besides, the technologies realization requires additional services of outside contractors. The novel cost effective approach has been proposed for increasing the share of the scrap that can be in-house recycled. It is based on the scarcely used electroslag crucible remelting furnace where a charge is melted and refined in a flux ambient. The furnace should substitute a traditional induction furnace in basic application. Moreover the usage of the specific environmentally friendly flux provides efficient protection of a melt from sufficient intake of gases. The experiments have demonstrated that the recycled metal tolerates stringent requirements of the superalloy industry.