Vacuum arc remelting process pdf
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During remelting, an electric arc is maintained between the tip of the consumable electrode (usually the The duties of the VAR process monitor are) provide accurate estimates of the state variables; 2) filter the measurement data; 3) detect sensor failures; and 4) detect process upsets. It is Vacuum arc remelting is a process used throughout the specialty metals industry for controlled casting of segregation sensitive and reactive metal alloy ingots Vacuum Arc Remelting (VAR) is one of the few approved methods for producing high quality, segregation-free ingots of aerospace alloys for rotating components. A simplified schematic of the process is shown in Figure 1 The vacuum arc remelting process was the first remelting cess to be used commercially for the production of steels superalloys. The vacuum arc remelting (VAR) process is widely used to improve the cleanliness and refine the structure of standard air melted or vacuum induction melted (VIM) ingots. Figureshows a schematic diagram of the VAR process that uses a stationary water-cooled mold. Optimal estimation theory has been applied to the problem of estimating process variables during vacuum arc remelting (VAR), a process widely used in the specialty metals Main modeling challenges for vacuum arc remelting (VAR) are briefly highlighted concerning various involving phenomena during the process such as formation and The Vacuum Arc Remelting process (VAR) is a type of consumable electrode remelting processes used for producing ingots of superalloys and Titanium. The Ni The computational model analyzes electromagnetics, turbulent flow in the metal pool, magnetic stirring, heat transfer, macrosegregation, and inclusion behavior for the In the secondary metals refining processes, vacuum arc remelting (VAR) and electroslag remelting (ESR), the consumable electrode is commonly produced by vacuum Vacuum arc remelting (VAR) is a process used to control the solidification of segregation sensitive alloys. Directional Solidification of the Vacuum Arc Remelting Process Precise control of the local solidification rate of the temperature gradient at the liquid/solid interface In this process, a cylindrically shaped, alloy eleetrode is loaded into the water-cooled, copper crucible of a VAR furnace, the is evacuated, and a DC arc is struck between the electrode (cathode) and some start material (e.g. It is also used in the triplex production of superalloys. These functions will be briefly discussed below. The tip of the electrode melts resulting in the formation of droplets The principle of the Vacuum Arc Remelting (VAR) pro-cess, as illustrated in Fig, consists in melting a consum-able metallic electrode of the required grade under a high vacuum, in order to obtain a sound ingot of good structural quality. metal chips) at the bottom of the crucible (anode) Main modeling challenges for vacuum arc remelting (VAR) are briefly highlighted concerning various involving phenomena during the process such as formation and movement of cathode spots on the surface of electrode, the vacuum plasma, side-arcing, the thermal radiation in the vacuum region, magnetohydrodynamics (MHD) in the molten pool, melting of the electrode, and solidification of the ingot Abstract. A block diagram of the monitor is shown in Figure 2 Computational Modeling of the Vacuum Arc Remelting (VAR Figureshows a The vacuum arc remelting (VAR) process is widely used to improve the cleanliness and refine the structure of standard air melted or vacuum induction melted (VIM) ingots. The VAR process involves complex interactions of the electromagnetic, flow, and heat transfer processes THE vacuum arc remelting (VAR) process is exten-sively used to purify numerous alloys such as stainless steel, Nickel-based, and Titanium-based alloys. It is a method of refining an impure alloy (electrode in VAR) through vacuum as heated by a DC arc. This article illustrates the VAR process and the capabilities and variables of the process The Vacuum Arc Remelting process (VAR) is a type of consumable electrode remelting processes used for producing ingots of superalloys and Titanium. Being introduced on an means that the necessary low remelting rates for large diameter ingots cannot always be maintained to achieve axis-parallel crystallization.