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CN-120608226-B - Method for preparing low-cost Ti52 titanium alloy cast ingot by using TA15 and TC6 return materials

CN120608226BCN 120608226 BCN120608226 BCN 120608226BCN-120608226-B

Abstract

The invention discloses a method for preparing a low-cost Ti52 titanium alloy cast ingot by using TA15 and TC6 return materials, which comprises the following steps of firstly, smelting raw materials in an electron beam cooling bed furnace to obtain a primary cast ingot; the method comprises the steps of carrying out vacuum consumable arc melting on a primary cast ingot, and cooling to obtain a Ti52 titanium alloy cast ingot. The preparation method of the invention prepares the low-cost high-quality Ti52 titanium alloy ingot by taking the TA15 return material, the TC6 return material, the sponge titanium and the intermediate alloy as raw materials and combining the advantages and disadvantages of electron beam cold bed furnace smelting and vacuum consumable arc smelting, avoids the occurrence of the phenomenon of uneven chemical components of the Ti52 titanium alloy ingot, obviously reduces the cost by adding the return material, and is suitable for the technical field of titanium alloy ingot preparation.

Inventors

  • Cao Jianghai
  • GE KE
  • YAN ZHAO
  • ZHANG ZHI
  • LIU YUMING
  • LI WEI
  • HOU ZHIMIN

Assignees

  • 西部钛业有限责任公司

Dates

Publication Date
20260508
Application Date
20250715

Claims (8)

  1. 1. A method for preparing a low-cost Ti52 titanium alloy ingot from TA15 and TC6 returns, comprising the steps of: Firstly, smelting raw materials in an electron beam cooling bed furnace to obtain an ingot, wherein the raw materials comprise intermediate alloy, TA15 return materials and TC6 return materials, the electron beam cooling bed furnace smelting comprises a bottom making process and a smelting process, the electron gun current in the bottom making process is 1A-6A, the smelting speed in the smelting process is 150 kg/h-900 kg/h, when the TA15 return materials and the TC6 return materials are in a block shape, before the electron beam cooling bed furnace smelting, the TA15 return materials and the TC6 return materials are subjected to acid washing, alkali washing and shot blasting, then raw materials except the TA15 return materials and the TC6 return materials are uniformly mixed and then pressed into electrode blocks, and the TA15 return materials, the TC6 return materials and the electrode blocks are layered in a feed box of the electron beam cooling bed furnace to be paved into a TA15 return material layer, a TC6 return material layer and an electrode block layer; When the TA15 return material and the TC6 return material are in a chip shape, crushing, cleaning and screening the TA15 return material and the TC6 return material before smelting in an electron beam cooling bed furnace, and uniformly mixing all raw materials and pressing the raw materials into an electrode block, wherein the total mass of the TA15 return material and the TC6 return material accounts for 60% -80% of the total mass of the raw materials; And step two, carrying out vacuum consumable arc melting on the primary cast ingot obtained in the step one, and cooling to obtain a Ti52 titanium alloy cast ingot.
  2. 2. The method for preparing a low-cost Ti52 titanium alloy cast ingot from TA15 and TC6 return materials according to claim 1, wherein in the first step, the intermediate alloy is one or more than two of aluminum-vanadium alloy, aluminum-chromium alloy, ferrotitanium alloy and aluminum-molybdenum alloy, the granularity of the aluminum-vanadium alloy is 0.83-3 mm, the granularity of the aluminum-chromium alloy is 1-3 mm, the granularity of the ferrotitanium alloy is 1-6 mm, and the granularity of the aluminum-molybdenum alloy is not more than 0.5mm.
  3. 3. The method for preparing a low-cost Ti52 titanium alloy ingot from TA15 and TC6 returns according to claim 1, wherein in the step one, the raw materials further comprise one or more of titanium sponge, zirconium sponge and aluminum, and the titanium sponge is more than grade 1 titanium sponge.
  4. 4. The method for preparing a low cost Ti52 titanium alloy ingot from TA15 and TC6 returns of claim 1, wherein the dimensions of the block in step one are greater than 100mm in length, greater than 100mm in width, and greater than 15mm in thickness.
  5. 5. The method for preparing a low-cost Ti52 titanium alloy ingot by using the TA15 and TC6 return materials according to claim 1, wherein the scraps in the first step are 5 mm-12 mm in length and 5 mm-12 mm in width, and the thickness is not more than 1mm.
  6. 6. The method for preparing a low-cost Ti52 titanium alloy ingot from TA15 and TC6 returns according to claim 1, wherein the crucible diameter for electron beam cold hearth melting in the step one is 300 mm-890 mm.
  7. 7. The method for preparing the low-cost Ti52 titanium alloy cast ingot by using the TA15 and TC6 return materials is characterized in that parameters of vacuum consumable smelting in the second step are smelting current 8 kA-36 kA, smelting voltage 22V-34V, arc stabilizing current 5A-30A and arc stabilizing period 5 s-30 s, and the diameter of a crucible for vacuum consumable smelting is 380 mm-10200 mm.
  8. 8. The method for preparing a low-cost Ti52 titanium alloy ingot from TA15 and TC6 return materials according to claim 1, wherein the ratio of the cross-sectional area of said primary ingot in step one to the cross-sectional area of said Ti52 titanium alloy ingot in step two is 0.62 to 0.88.

Description

Method for preparing low-cost Ti52 titanium alloy cast ingot by using TA15 and TC6 return materials Technical Field The invention belongs to the technical field of titanium alloy ingot casting preparation, and particularly relates to a method for preparing a low-cost Ti52 titanium alloy ingot from TA15 and TC6 return materials. Background The titanium alloy has the characteristics of high specific strength, low density, corrosion resistance, no magnetism and the like, and has very important application and potential for expanding the application in the fields of aerospace, weapon ships, petrochemical industry and the like. However, the titanium alloy has high cost and long processing flow, so that the price of the titanium alloy is higher than that of metals such as steel, aluminum and the like, and further wide application of the titanium alloy is limited. Therefore, cost reduction is an important and hot point of research of titanium alloy researchers in recent years. The common modes are (1) to replace expensive elements such as V by adding low-price elements such as Fe and the like, and (2) to reduce the cost of raw materials by adding titanium alloy returns. The Russian Avasti company reports that every 1% increase of the titanium return material can reduce the cost of the titanium alloy ingot by 0.7%, and the addition of the titanium return material reaches 50%, so that the cost of the titanium alloy ingot can be reduced by at least one third. The titanium alloy reclaimed materials comprise ingot riser, ingot bottom, bar head, plate edge strips, scraps and the like, and the risks of mixing other raw materials or impurities in the production process are caused, so that the components of the ingot are abnormal or impurities are finally caused. The vacuum consumable arc furnace is one of the most widely used modes for smelting titanium alloy at present, and has the advantages that the produced cast ingot has good component uniformity, but the impurity removing capability is limited due to the characteristics of melting and solidifying. The vacuum electron beam cold hearth furnace (EB) is another common smelting mode, and molten titanium melt stays on a cold hearth for a period of time, so that impurities brought by the titanium alloy return material can be effectively removed. However, due to the smelting characteristics of the electron beam cold hearth furnace, the electron beam cold hearth furnace can cause serious burning loss of low-saturation vapor pressure elements (such as Al, cr and the like), and the uniformity control difficulty of cast ingot components is high. Ti52 alloy (nominal composition is Ti-6.7Al-2V-1Zr-1.5Mo-2Cr-0.5 Fe) is a titanium alloy brand which is independently developed and designed in China. In the prior art, the Ti52 alloy is produced by adopting a titanium sponge and intermediate alloy mode, but the cost is higher, and the difficulty in removing inclusions and controlling the uniformity of components of the conventional titanium alloy return material is high, so that the wide use of the titanium alloy is severely limited. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide a method for preparing a low-cost Ti52 titanium alloy cast ingot by using TA15 and TC6 return materials. According to the method, the TA15 and TC6 return materials are adopted to replace part of raw materials, so that the preparation cost of the Ti52 titanium alloy cast ingot is reduced, and the uniformity of the Ti52 titanium alloy cast ingot is improved by combining a duplex smelting process of electron beam cold bed furnace smelting and vacuum consumable arc smelting, so that the problem of high cost for preparing the Ti52 alloy in the prior art is solved. In order to achieve the aim, the technical scheme adopted by the invention is that the method for preparing the low-cost Ti52 titanium alloy cast ingot by using the TA15 and TC6 return materials is characterized by comprising the following steps of: Smelting raw materials in an electron beam cooling bed furnace to obtain a primary cast ingot, wherein the raw materials comprise intermediate alloy, TA15 return materials and TC6 return materials; And step two, carrying out vacuum consumable arc melting on the primary cast ingot obtained in the step one, and cooling to obtain a Ti52 titanium alloy cast ingot. The method for preparing the low-cost Ti52 titanium alloy cast ingot by using the TA15 and TC6 return materials is characterized in that in the first step, the intermediate alloy is one or more than two of aluminum-vanadium alloy, aluminum-chromium alloy, ferrotitanium alloy and aluminum-molybdenum alloy, the granularity of the aluminum-vanadium alloy is 0.83-3 mm, the granularity of the aluminum-chromium alloy is 1-3 mm, the granularity of the ferrotitanium alloy is 1-6 mm, and the granularity of the aluminum-molybdenum alloy is not more than 0.5mm. The method for preparing the low-cost Ti52 titanium allo