Electroslag melting

MAGNETICALLY-CONTROLLED ELECTROSLAG MELTING (MEM) OF MULTICOMPONENT TITANIUM ALLOYS... 

Abstract Technology of the magnetically-controlled electroslag melting of titanium... 

Key words electroslag melting, magnetic field, metal pool, titanium alloys, ingot. 

The main task of the technology of the magnetically-controlled electroslag melting (MEM) is the control of processes of melting, transfer and crystallizaton of metal by creating various trajectories of movement of the metallurgical melt. 

Paton, B. et al. Plasma arc remelting in a copper water-cooled crystallizer as a new method of improving metal and alloy properties, Proc. Third Internat. Symp. Electroslag Melting Processes, Pittsburgh, USA 1971... 

Heating/Melting Method Induction Resistance Fuel Firing Electroslag Remelting... 

Unlike the traditional methods of titanium melting, VAR and EBR, the electroslag process is characterized by comparatively low-temperature, non-concentrated heat source, which is a slag pool and, respectively, a low temperature gradient in a metallurgical pool. This influences favorably the homogeneity of multicomponent titanium alloys. 

MEM of titanium alloys is realized in a pressurized electroslag chamber-type furnace (Figure 1). The melting space is preliminary evacuated, and then filled with an inert gas. This scheme of melting contributes to degassing of the consumable electrode and provides a reliable protection of titanium from harmful impurities. 

As fluxes for MEM of titanium, the reactive compositions on the base of halogenides of alkali and alkali-earth metals are used. Halogenide fluxes allow the electroslag process to be easily set and provide its stability within the wide range of melting conditions. Rate of dissolution of harmful inclusions of nitrides of titanium in these fluxes much exceeds their rate of dissolution in molten titanium [4], Thus, the premises for dissolution and grinding of hard a-phase type inclusions are created. 

Y.Y.Kompan, E.V.Shcherbinin Electroslag Welding and Melting with Controllable MHD-Processes. (Mashinostoyeniye, Moscow, 1989). 

Fiedler, H. et al. Results of plasma melting of steel, Fith Internat. Symp. Electroslag Remelting and Other Special Melting Processes Pittsburg, 1974... 

Allowed melting procedures vacuum arc furnace or electroslag remelting. 

The thermal processes are essentially incineration and melting. The types of incinerators in use include excess air incinerators, controlled air incinerators, fluidised bed incinerators, etc. The available melting processes include conventional melters, electroslag melters, plasma melters, etc. 

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