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Summary The effect of electroslag remelting (ESR) Pyromet 718 and A-286 alloys under an argon atmosphere and its resulting effect on ingot compositional control and oxide inclusion level were investigated using a laboratory consumable electrode furnace. Chemical composition data indicate that an argon cover during ESR rendered the slag a closed system where oxidation/reduction reactions were interdependent. This result provides potential for improved compositional control and lower ingot oxygen levels compared to air-ESR. Reasonable correlation between ingot oxygen content and volume percent inclusion level was attained and data show that low oxygen argon-remelted ingots exhibited a lower inclusion content than air-remelted ingots of higher oxygen content. These preliminary results demonstrate the improved process control of slag reactions provided by argon-ESR has the potential to improve the compositional control and "cleanliness" of superalloy ingots and consequently their mechanical properties.

Compositional Control and Oxide Inclusion Level Comparison of Pyromet 718 and A-286 Ingots Electroslag Remelted Under Air vs. Argon Atmosphere