Superalloy Ingot Production via Electron Beam Atomization

The patent replaces conventional mechanical melting and casting systems (VIM, ESR, VAR) with an electron beam-based system. The electron beam provides localized, high-energy heating that melts the alloy charge and controls solidification, eliminating the need for multiple sequential melting operations while enabling larger ingot diameters without increasing segregation

The patent changes the fundamental energy input parameter from thermal conduction/heating in conventional furnaces to direct electron beam energy deposition. This allows precise control of heating rate, temperature distribution, and solidification conditions, achieving superior compositional stability in large diameter ingots by controlling the electron beam power, scanning pattern, and chamber pressure

The patent employs a high-vacuum environment (10^-3 to 10^-6 Torr) throughout the electron beam melting and atomization process. This inert environment prevents oxidation and contamination of the molten alloy, eliminating the need for complex inert gas handling systems while achieving superior purity. The vacuum chamber serves as both the melting and atomization environment, simplifying equipment while reducing contamination

The patent replaces conventional mechanical atomization methods (gas or liquid jet impingement) with electron beam-induced atomization. The electron beam rapidly heats and vaporizes the molten alloy surface, creating a fine spray of atoms that condense into the ingot. This eliminates contact with contaminating gases or liquids while providing precise control over atomization and microstructure formation

The patent combines the melting and atomization functions into a single electron beam process. The same electron beam that melts the alloy charge also controls the solidification and atomization during ingot formation. This integration eliminates the need for separate melting and casting operations, reducing total energy consumption while achieving superior segregation control through continuous process control

The patent optimizes energy usage by controlling electron beam parameters (power, scanning speed, focal position) to achieve efficient melting and solidification. The electron beam energy is precisely deposited only where needed, and the process operates in vacuum to eliminate heat losses to the environment. Parameter optimization of beam current, voltage, and scanning patterns minimizes energy consumption while maintaining compositional stability