Method for preparing TA10 defective material into cast ingot by using duplex process

Abstract

The invention discloses a method for preparing a TA10 defective material into a cast ingot by using a duplex process. The method comprises the following steps that 1, the TA10 defective material is distributed in an electron beam cold bed furnace, then electron beam cold bed smelting is carried out to obtain an electron beam cold bed smelted cast ingot; and 2, vacuum consumable electrode arc melting is carried out on the electron beam cold bed smelted cast ingot twice to obtain the TA10 cast ingot. According to the method, the TA10 defective material is prepared into the TA10 cast ingot through the duplex process of electron beam cold bed smelting and vacuum consumable electrode electric arc smelting, through the material distribution and technological parameter control of the duplex process, it is guaranteed that element distribution in the TA10 cast ingot is uniform, the utilization rate of the TA10 defective material is increased, the production cost of the TA10 cast ingot is reduced, the production efficiency is improved, the TA10 cast ingot meets the national standard requirement, and the phenomena of cracking, surface peeling and the like do not exist in the subsequent machining process.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, and in particular relates to a method for preparing TA10 residues into ingots by using a duplex process. Background technique [0002] TA10 (Ti-0.3Mo-0.8Ni) alloy is a low-alloyed Ti-Mo-Ni near-alpha alloy developed to improve the crevice corrosion performance of pure titanium. The similar grade in the United States is Gr.12. The alloy contains 0.3% Mo and 0.8% Ni, which not only strengthens the alloy, but also has good crevice corrosion resistance to high temperature, low pH chloride or weak reducing acid, and its corrosion resistance The property is significantly better than pure titanium and close to TA9 alloy. TA10 alloy has good process plasticity and welding performance, and has been widely used in the chemical industry. The alloy can be used in the annealed state, and its main products are plates, rods, pipes, forgings and wires. [0003] Due to the processing characteristics of...

AI Technical Summary

Problems solved by technology

[0004] There are two conventional methods for smelting TA10 residues: the first method is to weld TA10 residues into electrodes and conduct vacuum consumable electrode arc melting. The main problems are as follows: ① This method requires titanium residues to be made by welding The consumable electrode with a specific shape, the recovery method is complicated, and the production efficiency is low; ②The welding is mostly carried out by argon tungsten arc welding or tungsten plasma welding, and there is a risk of high-density impurities entering during the welding process, and the solder joints have tungsten inclusions Risk; ③Smelting can only be carried out after welding electrodes, coupled with the characteristics of vacuum consumable electrode arc melting itself, the existence of high-density inclusions and low-density inclusions cannot be completely excluded in the product, and the quality of subsequent products cannot be guaranteed; ④ Electrode welding There is a risk of cracking during smelting, which increases the risk of arcing between the electrode and the crucible, and there is a major safety hazard; ⑤After recycling, the ingot needs to be forged into corresponding tubes, plates, and billets, which increases the overall recycling process. , can not achieve the purpose of improving efficiency and reducing costs; the second method is to use electron beam cooling bed smelting, electron beam cooling bed smelting does not require welding electrodes, and has a strong ability to recover and remove impurities, and can reduce high-density inclusions and low-density inclusions. In terms of vacuum consumable smelting technology, it far surpasses the vacuum self-consumption smelting technology, but there are mainly the following problems: ①It takes a while for the electron beam cooling bed smelting to start the gun and make the bottom, which causes the composition of the head and tail parts to be different from the normal smelting stage; ②The electron beam cooling bed smelting temperature is high , which is not conducive to the recovery of titanium alloy residues containing low melting point elements; ③The degree of stirring in the electron beam cooling bed smelting process is weak, there is no stable arc stirring, and the uniformity of the produced titanium alloy ingots cannot be guaranteed, which is easy to cause segregation ; ④Electron beam cooling bed smelting directly rolls the ingot smelted with TA10 residual material to the finished product, and the peeling and cracks are serious; stage

However, in the actual production, the TA10 ingot is prepared by one-time electron beam cooling bed melting, and when the plate is rolled to the finished product, there will be a large area of ​​peeling problem

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