What are the smelting technologies for titanium alloys?

               
Update: 29-12-2020
               
Abst:

  1. Method for preparing electrode for vacuum consumab […]

  1. Method for preparing electrode for vacuum consumable smelting of titanium alloy directly added with high melting point metal
On the basis of the conventional preparation of electrodes for vacuum consumable arc smelting of titanium alloys, a method of tailor-welding a directly pressed electrode block with a certain groove and a high melting point metal rod suitable for the groove shape of the electrode block is used to form an electrode. The vacuum consumable arc smelting process can smelt high-quality non-segregation-free ingots that meet the requirements of the ratio calculation and have a uniform composition.
  2. The process of restarting the arc after the power is interrupted in the vacuum consumable melting process of titanium and titanium alloy
The process of restarting the arc after the power is interrupted in the vacuum consumable smelting process of titanium and titanium alloys includes the following steps: when the arc is restarted after the smelting is interrupted, the smelting current is rapidly increased to 75-80% of the normal smelting current, and the process is maintained at this time When the edge of the molten pool reaches the crucible wall, keep it for 2-3 minutes, and then quickly increase the smelting current to the normal smelting current. The advantages of this process are that the total arc starting time is greatly shortened, the gap between the cooling volume of the ingot and the crucible wall after shrinking, and the internal shrinkage formed by the cooling and solidification of the ingot are avoided: when the melting current reaches the normal melting current When 75~80%, keep the smelting current for a period of time, which can more accurately control the melting speed of the electrode and the solidified molten pool, and avoid instantaneous generation of a large amount of molten liquid flowing into the gap between the ingot and the crucible wall, or causing cold barrier defects .
   3. Smelting recovery method of pure titanium block waste
The method of smelting and recycling pure titanium block scraps uses an electron beam cooling bed furnace with 6 electron guns. The raw materials of the selected composition are charged into the feeder of the electron beam cooling bed furnace for smelting, and then the obtained ingot is cooled and discharged from the furnace , You can get the finished product. This method directly uses TA1 recycled materials for smelting, avoiding the crushing of waste materials, the pressing of electrode blocks, and the welding of electrodes. Single ingot smelting equipment can smelt 9 bars with a total weight of about 6.5 tons per day, and double ingot smelting equipment can smelt 18 bars with a total weight of about 13 tons per day, which greatly improves the recovery efficiency and speed.
  4. Electron beam cooling bed smelting recovery method of titanium and titanium alloy scrap
The electron beam cooling-bed smelting recovery method of titanium and titanium alloy scraps, the process is: according to the smelted titanium and titanium alloy composition, weighing pure titanium scraps, or weighing pure titanium scraps and titanium alloy scraps One or two of them are mixed with sponge titanium and pure alloy additive elements and/or master alloys, the pure titanium and titanium alloy scraps in the mixture are added in a mass percentage of 10% to 90%; Then it is pressed into an electrode block, and the electrode block is subjected to primary electron beam cooling bed smelting in an electron beam cooling bed smelting furnace to obtain a titanium or titanium alloy ingot. The method can use up to 100% pure titanium scrap to produce qualified pure titanium ingots, or use up to 90% titanium and titanium alloy scraps to produce qualified titanium alloy ingots; only one electron beam cooling bed is required Smelting does not require two or three smelting.
   5. The smelting method of clean titanium and titanium alloy ingots
The smelting method of clean titanium and titanium alloy ingots, the method is: weighing sponge titanium or weighing pure alloy added elements, intermediate alloys and sponge titanium, sponge titanium or mixed pure alloy added elements, intermediate alloys and sponge Titanium is pressed into electrode blocks, the pressed electrode blocks are welded into electrodes, and the electrodes are smelted by an electron beam cooling bed in an electron beam cooling bed furnace to obtain clean titanium or titanium alloy ingots with uniform chemical composition; electron beam cooling The melting vacuum of bed smelting is less than 6×10-2Pa, the melting speed is 70~150kg/h, and the melting power is 100~300kw; the pure alloy added elements and the intermediate alloy are 0%~20% of the total weight of the titanium alloy ingot . The produced titanium and titanium alloy ingots have uniform chemical composition. The macroscopic structure of the ingots is better than that of vacuum consumable arc smelting ingots, and there are no high melting point inclusions such as TiN and WC.
   6. Smelting method of titanium alloy containing high melting point alloy elements
  The industrialized preparation method of titanium alloy ingots containing high melting point alloy elements. By selecting alloy raw materials, using specially assembled electrode blocks, using conventional vacuum consumable arc smelting technology, adjusting the current and voltage of the three smelting, preparing titanium alloy castings with uniform chemical composition and no inclusions containing high melting point alloy elements ingot. The high melting point metals are evenly distributed in the consumable electrode, the consumable electrode is easy to prepare, and the cost is low. The current and voltage parameters are reasonable during smelting. On the basis of the traditional process route, low-cost pure metal plates are used according to the specific consumable The electrode assembly method, instead of adding expensive master alloys and other pure metals to titanium alloys, uses multiple vacuum consumable arc melting furnaces for smelting to obtain titanium alloy ingots containing high melting point alloy elements with uniform composition. Industrial applications.
  7. Method for preparing TC4 titanium alloy ingot by smelting in electron beam cooling bed furnace
A method for preparing TC4 titanium alloy ingots by smelting in an electron beam cooling bed furnace. The method is: the sponge titanium and aluminum beans are mixed uniformly and pressed into electrode blocks, and the electrodes are welded into electrodes and placed in a vacuum consumable electric arc furnace. Ti-AI master alloy; crush the Ti-Al master alloy into Ti-Al master alloy particles; mix the sponge titanium, Al-V master alloy and Ti-Al master alloy particles uniformly and press them into electrode blocks, and splice them into the electrode post. In an electron beam cooling bed furnace, a TC4 titanium alloy ingot is obtained by one smelting. This method uses Ti-Al master alloy instead of aluminum beans, reduces the volatilization of Al elements, improves the utilization rate of raw materials and the efficiency of the electron beam cooling bed furnace. The electron beam cooling bed furnace used for one-time smelting reduces the titanium material It has stronger advantages in processing cost and improving production efficiency, which can improve the cleanliness of titanium alloy ingots and obtain high-quality ingots.

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