FOUNDRY ALLOY FOR CASTING HEAT-RESISTANT TITANIUM ALLOY AND METHOD OF ITS MAKING Russian patent published in 2012 - IPC C22C35/00 C22C27/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy of nonferrous metals, particularly, to production of foundry alloy for alloying refractory titanium-base alloys. Proposed composition contains the following substances, in wt %: tungsten 48.0-52.0, titanium 10.0-20.0, hafnium 0.08-0.1, aluminium making the rest. Charge is smelted in vacuum arc furnace with nonconsumable tungsten electrode. Note here that at first step, titanium placed on bottom of copper water-cooled casting mould and tungsten of higher density is placed there above. Titanium and tungsten are dissolved and melted in proportion corresponding to their content in foundry alloy to make integral ingot at arc current between charge and electrode of 750-1100 A and melting time of 3-10 min. To average ingot chemical composition, ingot is removed from casing mould to subject it to remelting at temperature higher than liquidus temperature of the alloy of titanium and tungsten. Then, required amount of aluminium and hafnium is added to remelted ingot to be placed under aforesaid ingot to proceed with melting at 1750-1900°C.

EFFECT: higher strength and heat resistance.

3 cl, 3 tbl