By B I Medovar, V Ya Saenko, G M Grigorenko, Yu M Pomarin, V I Kumysh
The ebook describes the strategy of remelting consumable electrodes with an electrical are burning among the skin of a liquid slag bathtub and a consumable electrode in a water-cooled copper mold. the strategy combines the chances of therapy of liquid steel with the electrical arc within the fuel surroundings and the liquid slag and some great benefits of plasma-arc and electro slag remelting. The technological probabilities, layout good points of melting platforms and result of experimental and commercial melting trials of steels and alloys are defined. as well as remelting structural steels, detailed realization is given to the potential of alloying the steel with nitrogen from the gasoline section, with no utilizing pricey nitrogen-bearing nonmetallic compounds, e.g. silicon nitride. it really is proven that arc slag remelting is additionally used successfully in generating ingots of titanium and its alloys. the consequences bought during this procedure are in comparison with electro slag remelting and plasma arc remelting. facts on power intake and steel caliber also are awarded.
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Additional info for ARC-Slag Remelting of Steel and Alloys
The values of the electrode end surface and of the surface of the slag and metal baths are important for arc-slag remelting. Usually, the effect of the surface of the liquid droplet in the processes of interaction of the metal with the gas is not strong because of the short existence of the droplet, and in the majority of cases it is usually ignored. Figure 18 shows a diagram of arc-slag remelting illustrating clearly possible reaction surfaces of the liquid melt with the gas atmosphere. 18a, in which the metal bath is completely covered with the liquid slag, gas-exchange processes have the highest rate on the surface of the melting electrode.
10. In region A the arc is unstable, whereas in the region B it is stable. As indicated by Fig. 10, with increasing electrode diameter (above 150 mm) the required energy density for ensuring a stable CPTR regime decreases and depends to a lesser content on the diameter. The graph also shows the results of various laboratory and industrial melts carried out by the ASR method. The cross indicates the melts with unstable regimes. They are situated in region A. The values of the energy density with the stable regime are distributed in region B.
When the weight of the liquid metal becomes equal to the surface tension force, the droplet stretches and a neck forms. In this case, the surface tension force has a compressing effect on the resultant droplet neck thus supporting droplet separation. e. 12. 1) slag; 2) electrode. 1) slag; 2) electrode. through the droplet. Therefore, in addition to the gravitational and surface tension forces, the liquid droplet metal is also strongly affected by the electrodynamic force (pinch effect) which compresses the droplet neck and leads to droplet separation.
ARC-Slag Remelting of Steel and Alloys by B I Medovar, V Ya Saenko, G M Grigorenko, Yu M Pomarin, V I Kumysh