A smelting method for titanium niobium alloy ingots, the alloy ingots according to the weight percentage, niobium content is 46.8 ~ 55%, the allowance for titanium, the specific steps are as follows: a plurality of titanium rods and a plurality of niobium rods are welded into consumable electrode; Among them, a titanium rod is evenly arranged around a circle of niobium rod, niobium rod is evenly arranged around a circle of titanium rod, niobium rod and titanium rod are placed in parallel; The consumable electrode is melted in the vacuum consumable arc furnace to obtain the primary ingot. Among them, the smelting current is 6-10KA, the smelting voltage is 27-30V; The titanium niobium alloy ingot was obtained by two more melting. The titanium niobium alloy ingot prepared by the invention has uniform and stable chemical composition, with chemical composition deviation less than 0.2% and no segregation and high density inclusion metallurgical defects. The invention is suitable for producing titanium niobium alloy ingot with high metallurgical quality.
Is the preparation of titanium niobium alloy ingot mainly through 2 ~ 3 times since the electricity arc smelting vacuum, its work art course are as follows: the sponge titanium and niobium crumbs mixture after pressed into the electrode piece, will the sponge titanium and niobium article fabrics after pressed into the electrode piece, then put the electrode block compound into consumable electrode, vacuum consumable electrode after 2 ~ 3 times since electricity arc smelting ingot casting.
The melting point of niobium is about 800°C higher than that of titanium. In the melting process of the consumable electrode prepared by the above method, the chemical composition uniformity of the ingot is easy to be poor because of the different melting rate of each part. In addition, because the density of niobium is about two times that of titanium, the niobium chips that are not completely melted in the smelting process are easy to sink to the bottom of the molten pool, resulting in niobium inclusion. Therefore, a better preparation method is needed to improve the metallurgical quality of Ti-Ag alloy ingot.
To overcome the shortcomings of the existing technology, a melting method of Ti-Nb alloy ingot with high quality and stability is provided, which can improve the ingot of ti-NB alloy made by the existing technology, such as uneven composition and niobium inclusion, improve the material yield of raw material and reduce material loss.
