BEHAVIOR OF ACTIVE ELEMENTS DURING ELECTROSLAG REMELTING OF NICKEL BASE ALLOYS.

The behavior of such active elements as Mg, Al, and Si during electroslag remelting of high Cr-Fe-Mo-Co-W nickel alloys was investigated in a small ESR unit. CaF//2-base Mg** plus ** plus bearing slags of two or three components were compared with conventional CaF//2 mono- and CaF//2-Al//2O//3 binary slags. Several hundred ppm of magnesium was found in the ESR ingots remelted under slags containing a suitable amount of Mg** plus ** plus and low CaO and Al//2O//3, although no magnesium but aluminum or silicon was added to the original electrodes. It was shown that the distribution ratio of magnesium between slag and metal was related to the concentration of Al** plus ** plus ** plus in the slag, oxygen, and aluminum in the metal.