CN111842855B - Method for preparing TA10 residual material into cast ingot by using duplex process - Google Patents
Method for preparing TA10 residual material into cast ingot by using duplex process Download PDFInfo
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- CN111842855B CN111842855B CN202010773105.6A CN202010773105A CN111842855B CN 111842855 B CN111842855 B CN 111842855B CN 202010773105 A CN202010773105 A CN 202010773105A CN 111842855 B CN111842855 B CN 111842855B
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Abstract
The invention discloses a method for preparing TA10 residual material into cast ingots by using a duplex process, which comprises the following steps: distributing the TA10 residual material in an electron beam cold bed furnace, and then carrying out electron beam cold bed smelting to obtain an electron beam cold bed smelting ingot; and secondly, carrying out vacuum consumable electrode arc melting twice on the electron beam cold bed melted ingot to obtain a TA10 ingot. According to the invention, TA10 cast ingots are prepared by a duplex process of electron beam cold bed smelting and vacuum consumable electrode arc smelting, and by material distribution and control of process parameters of the duplex process, uniform distribution of elements in TA10 cast ingots is ensured, the utilization rate of TA10 residual materials is improved, the production cost of TA10 cast ingots is reduced, and the production efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of titanium alloy, and particularly relates to a method for preparing a cast ingot from TA10 residual materials by using a duplex process.
Background
TA10(Ti-0.3Mo-0.8Ni) alloy is a low-alloying Ti-Mo-Ni near-alpha alloy developed for improving the crevice corrosion performance of pure titanium, and the U.S. similar mark is Gr.12. The alloy contains 0.3 mass percent of Mo and 0.8 mass percent of Ni, so that the alloy is strengthened, and has good crevice corrosion resistance to high-temperature and low-pH chloride or weak reducing acid, and the corrosion resistance of the alloy is remarkably superior to that of pure titanium and is close to that of TA9 alloy. The TA10 alloy has good technological plasticity and welding performance and is widely applied in the chemical industry. The alloy can be used in an annealed state, and the main products of the alloy comprise plates, bars, pipes, forgings and wires.
Due to the processing characteristics of titanium, the production process is complex, the processing flow is long, and the yield is low, so that a large amount of titanium and titanium alloy blocky and chip-shaped residual wastes are generated in the processing process. This has been a significant problem that plagues the development of the titanium industry. A large amount of manpower and material resources are invested in various countries in the world to research the recovery treatment technology of the residual titanium and titanium alloy waste, a series of achievements are obtained, and part of the titanium waste is recycled after recovery treatment, so that the aims of saving resources and reducing cost are fulfilled.
There are two conventional TA10 scrap melting methods: the first method is to weld TA10 scraps into an electrode and perform vacuum consumable electrode arc melting, and mainly has the following problems: firstly, the method needs to make titanium residue into a consumable electrode with a specific shape through welding, the recovery mode is complicated in process, and the production efficiency is low; welding is mostly carried out by argon tungsten-arc welding or plasma tungsten-arc welding, high-density impurities enter in the welding process, and the welding spot has the risk of tungsten inclusion; melting can be carried out by welding an electrode, and the characteristics of vacuum consumable electrode arc melting are added, so that the existence of high-density impurities and low-density impurities cannot be completely eliminated in a product, and the quality of a subsequent product cannot be ensured; the electrode is welded, so that cracking risk is caused during smelting, the risk of arcing between the electrode and the crucible is increased, and great potential safety hazard is caused; fifthly, the recovered cast ingot needs to be forged into corresponding pipe, plate and bar billet in the later stage, so that the whole recovery process is increased, and the aims of improving the efficiency and reducing the cost are not achieved; the second method adopts electron beam cold bed smelting, does not need welding electrodes, has strong recycling and impurity removing capability, and greatly exceeds the vacuum consumable smelting technology in the capability of reducing high-density impurities and low-density impurities, but mainly has the following problems: firstly, a period of time is needed for electron beam cold bed smelting to start up a gun and prepare a bottom, so that the components of the head and the tail are different from those of a normal smelting stage; the electron beam cold bed smelting temperature is high, which is not beneficial to the recovery of titanium alloy residue containing low-melting point elements; thirdly, the stirring degree is weak in the electron beam cold bed smelting process, arc stabilization stirring is not performed, the uniformity of the components of the produced titanium alloy ingot cannot be guaranteed, and segregation is easily caused; fourthly, electron beam cold bed smelting directly rolls the cast ingot smelted by the TA10 residual material to a finished product, and the peeling and the cracks are serious; and fifthly, the pure titanium residue is smelted and recovered by using an electron beam cold bed at home, and the recovered titanium alloy residue is still in a test stage. Therefore, the conventional method is not suitable for preparing titanium alloy ingots by scrap recovery.
The northwest nonferrous metals research institute discloses an electron beam cold bed smelting recovery method of titanium and titanium alloy chip-shaped waste materials, wherein 15kg of pure titanium chip materials are melted into a small cylindrical ingot sample with phi of 215mm on a 500KW power electron beam cold bed furnace, and the pure chip materials are directly melted and flow into a crystallizer for condensation through two electron beam furnaces after being pressed and welded into electrodes. However, in the actual production, TA10 cast ingot is prepared by primary electron beam cold bed smelting, and when the plate is rolled to a finished product, the problem of large-area peeling occurs. Therefore, a method for preparing the TA10 residual material into an ingot with stable processing performance is needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for preparing TA10 residual material into cast ingots by using a duplex process aiming at the defects of the prior art. According to the method, TA10 residual materials are prepared into the TA10 cast ingot through a duplex process of electron beam cold bed smelting and vacuum consumable electrode arc smelting, and by controlling process parameters of the duplex process and controlling the material distribution mode in an electron beam cold bed furnace, the uniform distribution of all elements in the TA10 cast ingot is ensured, the utilization rate of the TA10 residual materials is improved, and the production cost of the TA10 cast ingot is reduced.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a method of making TA10 scrap into ingots using a duplex process, comprising the steps of:
step one, distributing the TA10 residual material in an electron beam cold bed furnace, and then carrying out electron beam cold bed smelting to obtain an electron beam cold bed smelting ingot; the conditions of the electron beam cold bed smelting are as follows: vacuum degree in electron beam cold bed furnace is less than 9 x 10-3Torr, the melting speed is 400 kg/h-600 kg/h, the melting time is 8.5 h-11.5 h, the feeding time is 1 h-2 h, and cooling is carried out for 4 h-6 h after the melting is finished;
step two, performing vacuum consumable electrode arc melting twice on the electron beam cold bed melting ingot obtained in the step one to obtain a TA10 ingot, wherein the TA10 ingot is a cylindrical ingot with the cross section diameter of 720-920 mm; the two vacuum consumable electrode arc melting processes are as follows: welding the electron beam cold bed smelting ingot in a vacuum consumable electrode arc furnace to form a consumable electrode, then carrying out first vacuum consumable electrode arc smelting on the consumable electrode to obtain a first smelting ingot, carrying out second vacuum consumable electrode arc smelting on the first smelting ingot, and cooling for 6-8 h after smelting is finished to obtain a TA10 ingot, wherein the smelting current in the first vacuum consumable electrode arc smelting is 19-27 kA, the first smelting ingot is cylindrical with the cross section diameter of 640-820 mm, the smelting speed in the second vacuum consumable electrode arc smelting is 18-25 kg/min, and the feeding time is 2-3 h.
According to the invention, TA10 residual materials are prepared into TA10 cast ingots through a duplex process of electron beam cold bed smelting and vacuum consumable electrode arc smelting, high-density impurities and low-density impurities in titanium residual materials are removed by a sedimentation method through the electron beam cold bed smelting, the method has the advantage of strong recovery and impurity removal capability, the TA10 residual materials are not required to be welded into electrodes, the production efficiency is improved, the defects of the electron beam cold bed smelting and stirring process are made up through the vacuum consumable electrode arc smelting, the uniformity of components of the TA10 cast ingots is ensured, the TA10 cast ingots meet the national standard requirements, and the phenomena of cracking, surface peeling and the like do not exist in the follow-up processing of the TA10 cast ingots; the production method adopts the TA10 residual material for production, does not need to add other substances, greatly improves the utilization rate of the TA10 residual material, and reduces the production cost of the TA10 cast ingot; the TA10 cast ingot prepared by the method has larger cross section diameter, and the application range of the TA10 cast ingot is enlarged; according to the invention, through material distribution, the TA10 residual material can be uniformly mixed in the electron beam cold bed smelting process, so that the uniformity of a TA10 cast ingot is ensured; the electron beam cold bed smelting ingot is welded into the consumable electrode in the vacuum consumable electrode arc furnace, a welding gun is not needed, and the risks of cracking and arc striking of the consumable electrode and a crucible during smelting are avoided.
According to the invention, by controlling the vacuum degree of electron beam cold bed smelting, the decomposition and volatilization of impurities in metal under the condition of low vacuum are ensured, the continuous flowing matching of molten solution in a cold bed and a crystallizer is achieved by controlling the smelting speed, the defects of discontinuous production and ingot casting quality reduction caused by too large or too small smelting speed are avoided, high-density impurities and low-density impurities are effectively removed by controlling the smelting time, the solidification defect of an ingot casting riser is reduced by controlling the feeding time, the yield is improved, the defects of production efficiency reduction and ingot casting component influence caused by too long feeding time are avoided, and the defects of too deep ingot casting riser and reduced yield caused by too short feeding time are avoided.
The invention welds the electron beam cold bed smelting ingot casting into the consumable electrode in the vacuum consumable electric arc furnace without using a welding gun, avoids the occurrence of high-density inclusion and low-density inclusion, by controlling the smelting current of the first vacuum consumable electrode arc smelting, the deslagging and degassing have the optimal effect, the purity of the TA10 cast ingot is ensured, the production efficiency is improved, by controlling the size of the first smelting ingot, the subsequent processing is convenient to be carried out smoothly, the production efficiency is improved, the ingot is ensured not to generate segregation, the melting speed of the second vacuum consumable electrode arc melting is controlled, so that the melting speed is basically constant in the whole melting process, the uniformity of components and the consistency of the structure of TA10 cast ingots are facilitated, the defect of poor uniformity of the components and the structure caused by overhigh melting speed is avoided, and the defects of low production efficiency and poor surface quality caused by overhigh melting speed are avoided; by controlling the feeding time, the solidification defect of the cast ingot riser is reduced, the yield is improved, the defects that the production efficiency is reduced and the components of the cast ingot are influenced due to overlong feeding time are avoided, and the defects that the cast ingot riser is too deep and the yield is reduced due to too short feeding time are avoided.
The method for preparing the TA10 residual material into the cast ingot by using the duplex process is characterized in that the TA10 residual material in the step one is divided into dead head residual material, rod head residual material, tube head residual material and lath residual material according to forms, then each residual material in the dead head residual material, the rod head residual material, the tube head residual material and the lath residual material is divided into high-oxygen residual material and low-oxygen residual material according to the mass content of oxygen, the high-oxygen residual material is the residual material obtained by processing TA10 with the mass fraction of oxygen of 0.08-0.2%, and the low-oxygen residual material is the residual material obtained by processing TA10 with the mass fraction of oxygen of less than 0.08%. According to the invention, TA10 residual materials are classified, TA10 residual materials with different forms and different oxygen contents are distinguished, so that subsequent material distribution is facilitated, and uniform matching of various TA10 residual materials is ensured, thereby ensuring that various TA10 residual materials can be uniformly mixed in the electron beam cold bed smelting process.
The method for preparing the TA10 residual material into the cast ingot by using the duplex process is characterized in that the material distribution mode in the step one is as follows: the method comprises the following steps of distributing lath residual materials on the lower portion of an electron beam cold hearth furnace to form lower material, distributing two residual materials of pipe head residual materials, rod head residual materials and riser head residual materials on the upper portion of the electron beam cold hearth furnace to form upper material, wherein the upper material is distributed in a layer-by-layer alternating mode according to the sequence of high oxygen and low oxygen; the mass ratio of the high-oxygen residual materials to the low-oxygen residual materials distributed in the electron beam cold bed furnace is 2: 1. According to the invention, TA10 residual materials are distributed, lath residual materials with larger volume are placed at the lower part, riser residual materials, rod head residual materials and tube head residual materials with smaller volume are placed on the lath residual materials, so that the smelting is favorably and smoothly carried out, various TA10 residual materials are uniformly matched, and the TA10 residual materials with various forms can be uniformly mixed in the electron beam cold bed smelting process, so that the uniformity of a TA10 cast ingot is ensured, the residual materials with different oxygen contents are uniformly mixed by alternately distributing the high-oxygen residual materials and the low-oxygen residual materials according to layers, the uniform distribution of oxygen elements in the TA10 cast ingot is ensured, the oxygen content in the TA10 cast ingot is controlled by controlling the mass ratio of the high-oxygen residual materials to the low-oxygen residual materials, and the oxygen content in the TA10 cast ingot can be matched with national standards.
The method for preparing the TA10 residual material into the cast ingot by using the duplex process is characterized in that in the step one, the cast ingot is smelted by the electron beam cold hearth into a flat ingot with the length of 1350mm and the width of 250mm, a flat ingot with the length of 1050mm and the width of 250mm or a cylindrical ingot with the cross section diameter of 620 mm. The invention is beneficial to the vacuum consumable electrode arc melting by controlling the size of the electron beam cold bed melting ingot.
The method for preparing the TA10 residual material into the cast ingot by using the duplex process is characterized in that the cast ingot is smelted by an electron beam cold hearth into a flat ingot with the length of 1350mm and the width of 250mm or a flat ingot with the length of 1050mm and the width of 250mm, the flat ingot is cut into two parts along the length direction of the flat ingot, and then the two parts are welded into a consumable electrode in a vacuum consumable electrode arc furnace. Because the vacuum consumable electrode arc melting is carried out subsequently, the crucible of the vacuum consumable electrode arc melting furnace is round, and a flat ingot needs to be cut into two equal parts and then welded into a consumable electrode in order to ensure that the consumable electrode can be put into the crucible.
The method for preparing the TA10 residual material into the cast ingot by using the duplex process is characterized in that the vacuum degree in the vacuum consumable electrode arc furnace in the vacuum consumable electrode arc melting for two times in the step two is less than 5Pa, and the gas leakage rate is less than 0.6 Pa/min. According to the invention, through controlling the vacuum degree and the air leakage rate, air does not enter the device in the operation process, so that oxygen and nitrogen are not additionally introduced into the TA10 cast ingot, and the quality of the TA10 cast ingot is improved.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, TA10 residual materials are prepared into TA10 cast ingots through a duplex process of electron beam cold bed smelting and vacuum consumable electrode arc smelting, and by controlling the process parameters of the duplex process and controlling the material distribution mode in an electron beam cold bed furnace, the uniform distribution of all elements in the TA10 cast ingots is ensured, so that the TA10 cast ingots have the advantages of good surface quality, less internal high-density impurities and low-density impurities, the utilization rate of the TA10 residual materials is improved, the production cost of the TA10 cast ingots is reduced, the phenomena of cracking, surface peeling and the like do not exist in subsequent processing, and the TA 3578 cast ingots can be widely applied to the fields of ocean, chemical engineering and medical treatment.
2. According to the invention, TA10 scrap is not required to be welded into an electrode, electron beam cold bed smelting is directly carried out, the risk of generating high-density impurities and low-density impurities is reduced, the uniformity of components of a TA10 cast ingot is ensured, and the production efficiency is improved; the invention ensures that the TA10 residual material can be uniformly mixed in the electron beam cold bed smelting process by controlling the material distribution mode in the electron beam cold bed furnace, thereby ensuring the uniform distribution of each element in the TA10 cast ingot.
3. The method adopts the TA10 residual material for production, does not need to add other substances, greatly improves the utilization rate of the TA10 residual material, reduces the production cost of the TA10 cast ingot, can directly produce the TA10 cast ingot, reduces the subsequent forging processing flow, and realizes short-flow and low-cost recovery.
4. The method has low production cost and high efficiency, is suitable for industrialized and batch production, can slow down the demand pressure of raw materials, reduce the production cost of titanium materials, meet the market demands at home and abroad, fill up the blank of the domestic titanium alloy residue recovery technology, produce the titanium alloy with low cost and high quality, and improve the competitiveness of products.
The technical solution of the present invention is further described in detail by examples below.
Detailed Description
Example 1
The embodiment comprises the following steps:
step one, distributing the TA10 residual material in an electron beam cold bed furnace, and then carrying out electron beam cold bed smelting to obtain an electron beam cold bed smelting ingot; the conditions of the electron beam cold bed smelting are as follows: the vacuum degree in the electron beam cold hearth furnace is 8 multiplied by 10- 3Torr, the melting speed is 400kg/h, the melting time is 11.5h, the feeding stage is carried out by adopting a method of gradually reducing the power of 6# and 7# electron guns, the feeding time is 2h, and cooling is carried out for 6h after the melting is finished; the TA10 residual material comprises 4330kg of high-oxygen residual material and 2170kg of low-oxygen residual material, the high-oxygen residual material comprises 3000kg of batten residual material and 1330kg of riser residual material, and the low-oxygen residual material comprises 1085kg of riser residual material and 1085kg of pipe head residual material; the cloth mode is as follows: distributing lath residual materials on the lower part of the electron beam cold hearth furnace to form lower material, distributing riser residual materials and pipe head residual materials on the upper part of the electron beam cold hearth furnace to form upper material, wherein the upper material is distributed in turn according to the sequence of high oxygen and low oxygen in layers; the electron beam cold bed furnace is a 3150KWB BMO-01 type electron beam cold bed furnace; the electron beam cold bed smelting ingot is a slab ingot with the length multiplied by the width multiplied by the height of 1350mm multiplied by 250mm multiplied by 7130 mm;
step two, performing vacuum consumable electrode arc melting twice on the electron beam cold hearth melting ingot obtained in the step one to obtain a TA10 ingot, wherein the TA10 ingot is a cylindrical ingot with the diameter of 920mm multiplied by 3200mm (the diameter of the cross section multiplied by the height); the two vacuum consumable electrode arc melting processes are as follows: cutting the electron beam cold bed smelting ingot into two equal parts along the length direction of the ingot, welding the two equal parts into a consumable electrode in a vacuum consumable electrode arc furnace, carrying out first vacuum consumable electrode arc smelting on the consumable electrode to obtain a first smelting ingot, and carrying out second vacuum consumable electrode arc smelting on the first smelting ingot to obtain a TA10 ingot; the smelting current of the first vacuum consumable electrode arc smelting is 27kA, and the first smelting ingot is a cylindrical ingot with the cross section diameter of 820 mm; the melting speed of the second vacuum consumable electrode arc melting is 22.5 kg/min; the vacuum consumable electric arc furnace is a VAR L920P8Ti type vacuum consumable electric arc furnace; the vacuum degree of the two times of vacuum consumable electrode arc melting is 4Pa, the gas leakage rate is 0.5Pa/min, the feeding time of the second time of vacuum consumable electrode arc melting is 3h, and the cooling is carried out for 8h after the melting is finished.
The TA10 cast ingot prepared in this example was found to be free of cracking, surface peeling, and the like during subsequent processing.
Example 2
The embodiment comprises the following steps:
step one, distributing the TA10 residual material in an electron beam cold bed furnace, and then carrying out electron beam cold bed smelting to obtain an electron beam cold bed smelting ingot; the conditions of the electron beam cold bed smelting are as follows: the vacuum degree in the electron beam cold hearth furnace is 7 multiplied by 10- 3Torr, the melting speed is 600kg/h, the melting time is 8.5h, the feeding stage is carried out by adopting a method of gradually reducing the power of 6# and 7# electron guns, the feeding time is 1h, and cooling is carried out for 4h after the melting is finished; the TA10 residual material is 3000kg of high-oxygen residual material and 1500kg of low-oxygen residual material, the high-oxygen residual material is 2000kg of batten residual material and 1000kg of club head residual material, and the low-oxygen residual material is 750kg of club head residual material and 750kg of tube head residual material; the cloth mode is as follows: distributing lath residual materials on the lower part of the electron beam cold bed furnace to form lower material, distributing rod head residual materials and pipe head residual materials on the upper part of the electron beam cold bed furnace to form upper material, wherein the upper material is distributed in turn according to the sequence of high oxygen and low oxygen in layers; the electron beam cold bed furnace is a 3150KWB BMO-01 type electron beam cold bed furnace; the electron beam cooling bedSmelting a cast ingot into a flat ingot with the length multiplied by the width multiplied by the height of 1050mm multiplied by 250mm multiplied by 3800 mm;
step two, performing vacuum consumable electrode arc melting twice on the electron beam cold bed melting ingot obtained in the step one to obtain a TA10 ingot, wherein the TA10 ingot is a cylindrical ingot of 720mm multiplied by 2460mm (cross section diameter multiplied by height); the two vacuum consumable electrode arc melting processes are as follows: cutting the electron beam cold bed smelting ingot into two equal parts along the length direction of the ingot, welding the two equal parts into a consumable electrode in a vacuum consumable electrode arc furnace, carrying out first vacuum consumable electrode arc smelting on the consumable electrode to obtain a first smelting ingot, and carrying out second vacuum consumable electrode arc smelting on the first smelting ingot to obtain a TA10 ingot; the smelting current of the first vacuum consumable electrode arc smelting is 19kA, and the first smelting ingot is a cylindrical ingot with the cross section diameter of 640 mm; the melting speed of the second vacuum consumable electrode arc melting is 18 kg/min; the vacuum consumable electric arc furnace is a VAR L920P8Ti type vacuum consumable electric arc furnace; the vacuum degree of the two times of vacuum consumable electrode arc melting is 3Pa, the gas leakage rate is 0.4Pa/min, the feeding time of the second time of vacuum consumable electrode arc melting is 2h, and the cooling is carried out for 6h after the melting is finished.
The TA10 cast ingot prepared in this example was found to be free of cracking, surface peeling, and the like during subsequent processing.
Example 3
The embodiment comprises the following steps:
step one, distributing the TA10 residual material in an electron beam cold bed furnace, and then carrying out electron beam cold bed smelting to obtain an electron beam cold bed smelting ingot; the conditions of the electron beam cold bed smelting are as follows: the vacuum degree in the electron beam cold hearth furnace is 6 multiplied by 10- 3Torr, the melting speed is 500kg/h, the melting time is 10h, the feeding stage is carried out by adopting a method of gradually reducing the power of 6# and 7# electron guns, the feeding time is 1.5h, and cooling is carried out for 5h after the melting is finished; the TA10 residual material comprises 3000kg of high-oxygen residual material and 1500kg of low-oxygen residual material, the high-oxygen residual material comprises 2000kg of lath residual material and 1000kg of riser residual material, and the low-oxygen residual material comprises 750kg of riser residual material and 750kg of pipe head residual material; the cloth mode is as follows: in thatThe lower part of the electron beam cold hearth furnace is provided with lath residual materials to form lower material, the upper part of the electron beam cold hearth furnace is provided with riser residual materials and tube head residual materials to form upper material, and the upper material is sequentially and alternately distributed in layers according to the sequence of high oxygen and low oxygen; the electron beam cold bed furnace is a 3150KWB BMO-01 type electron beam cold bed furnace; the electron beam cold bed smelting ingot is a cylindrical ingot with the diameter of 620mm multiplied by 3000mm (the diameter of the cross section is multiplied by the height);
step two, performing vacuum consumable electrode arc melting twice on the electron beam cold bed melting ingot obtained in the step one to obtain a TA10 ingot, wherein the TA10 ingot is a cylindrical ingot with the diameter of 820mm multiplied by 1900mm (the diameter of the cross section is multiplied by the height); the two vacuum consumable electrode arc melting processes are as follows: welding the electron beam cold bed smelting ingot into a consumable electrode in a vacuum consumable electrode arc furnace, carrying out first vacuum consumable electrode arc smelting on the consumable electrode to obtain a first smelting ingot, and carrying out second vacuum consumable electrode arc smelting on the first smelting ingot to obtain a TA10 ingot; the smelting current of the first vacuum consumable electrode arc smelting is 20kA, and the first smelting ingot is a cylindrical ingot with the cross section diameter of 720 mm; the melting speed of the second vacuum consumable electrode arc melting is 25 kg/min; the vacuum consumable electric arc furnace is a VAR L920P8Ti type vacuum consumable electric arc furnace; the vacuum degree of the two times of vacuum consumable electrode arc melting is 2Pa, the gas leakage rate is 0.3Pa/min, the feeding time of the second time of vacuum consumable electrode arc melting is 2.5h, and the second time of vacuum consumable electrode arc melting is cooled for 7h after the melting is finished.
The TA10 cast ingot prepared in this example was found to be free of cracking, surface peeling, and the like during subsequent processing.
Example 4
The embodiment comprises the following steps:
step one, distributing the TA10 residual material in an electron beam cold bed furnace, and then carrying out electron beam cold bed smelting to obtain an electron beam cold bed smelting ingot; the conditions of the electron beam cold bed smelting are as follows: the vacuum degree in the electron beam cold hearth furnace is 6 multiplied by 10- 3Torr, the melting speed is 550kg/h, the melting time is 11h, and the feeding stage adopts a method of gradually reducing the power of 6# and 7# electron gunsCarrying out feeding for 1.7h, and cooling for 5.5h after smelting is finished; the TA10 residual materials comprise 4330kg of high-oxygen residual materials and 2170kg of low-oxygen residual materials, 3000kg of lath residual materials and 1330kg of riser residual materials, and 1085kg of riser residual materials and 1085kg of club head residual materials; the cloth mode is as follows: distributing lath residual materials at the lower part of the electron beam cooling bed furnace to form lower material, distributing riser residual materials and rod head residual materials at the upper part of the electron beam cooling bed furnace to form upper material, wherein the upper material is distributed in turn according to the sequence of high oxygen and low oxygen in layers; the electron beam cold bed furnace is a 3150KWB BMO-01 type electron beam cold bed furnace; the electron beam cold hearth smelting ingot is a cylindrical ingot with the diameter of 620mm multiplied by 4780mm (the diameter of the cross section multiplied by the height);
step two, performing vacuum consumable electrode arc melting twice on the electron beam cold bed melting ingot obtained in the step one to obtain a TA10 ingot, wherein the TA10 ingot is a cylindrical ingot with the diameter of 820mm multiplied by 2730mm (the diameter of the cross section is multiplied by the height); the two vacuum consumable electrode arc melting processes are as follows: welding the electron beam cold bed smelting ingot into a consumable electrode in a vacuum consumable electrode arc furnace, carrying out first vacuum consumable electrode arc smelting on the consumable electrode to obtain a first smelting ingot, and carrying out second vacuum consumable electrode arc smelting on the first smelting ingot to obtain a TA10 ingot; the smelting current of the first vacuum consumable electrode arc smelting is 20kA, and the first smelting ingot is a cylindrical ingot with the cross section diameter of 720 mm; the melting speed of the second vacuum consumable electrode arc melting is 21.5 kg/min; the vacuum consumable electric arc furnace is a VAR L920P8Ti type vacuum consumable electric arc furnace; the vacuum degree of the two times of vacuum consumable electrode arc melting is 4Pa, the gas leakage rate is 0.3Pa/min, the feeding time of the second time of vacuum consumable electrode arc melting is 2.5h, and the second time of vacuum consumable electrode arc melting is cooled for 7h after the melting is finished.
The TA10 cast ingot prepared in this example was found to be free of cracking, surface peeling, and the like during subsequent processing.
TA10 ingots prepared in examples 1 to 4 were peeled, bottom-cut, and cap-cut in this order, and then sampled at the upper, middle, and lower portions thereof, and the sampled samples were subjected to chemical composition measurement, wherein elements such as Mo, Ni, Fe, and C were measured by an ICP emission spectrometer, elements such as O, N, H were measured by an LECO oxynitrimeter, and the measurement results are shown in table 1. The sampling positions are: the upper part is a side surface which is 200 mm-300 mm away from the upper end surface of the TA10 cast ingot, the lower part is a side surface which is 200 mm-300 mm away from the lower end surface of the TA10 cast ingot, and the middle part is a side surface which is equidistant from the end surfaces of the two ends of the TA10 cast ingot; the sampling process comprises the following steps: removing 5-7 mm of the surface of each sampling part by using a lathe, and then preparing a sample in a turning mode, wherein the sampling width is not more than 40mm, and the depth is not more than 12 mm.
TABLE 1
As can be seen from the above table, the TA10 ingots prepared in examples 1 to 4 of the present invention have uniform distribution of each element, no segregation of element components, and each element content meets the TA10 standard in GB/T3620.1-2007 "titanium and titanium alloy mark and chemical component" and ASTM B265-2013 standard, and can meet the chemical component requirement of TA10 welding wire specified in the more strict GB/T3623 + 2007 "titanium and titanium alloy wire" standard.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (6)
1. A method of making TA10 scrap into ingots using a duplex process, comprising the steps of:
step one, distributing the TA10 residual material in an electron beam cold bed furnace, and then carrying out electron beam cold bed smelting to obtain an electron beam cold bed smelting ingot;the conditions of the electron beam cold bed smelting are as follows: vacuum degree in electron beam cold bed furnace is less than 9 x 10- 3Torr, the melting speed is 400 kg/h-600 kg/h, the melting time is 8.5 h-11.5 h, the feeding time is 1 h-2 h, and cooling is carried out for 4 h-6 h after the melting is finished;
step two, performing vacuum consumable electrode arc melting twice on the electron beam cold bed melting ingot obtained in the step one to obtain a TA10 ingot, wherein the TA10 ingot is a cylindrical ingot with the cross section diameter of 720-920 mm; the two vacuum consumable electrode arc melting processes are as follows: welding the electron beam cold bed smelting ingot in a vacuum consumable electrode arc furnace to form a consumable electrode, then carrying out first vacuum consumable electrode arc smelting on the consumable electrode to obtain a first smelting ingot, carrying out second vacuum consumable electrode arc smelting on the first smelting ingot, and cooling for 6-8 h after smelting is finished to obtain a TA10 ingot, wherein the smelting current in the first vacuum consumable electrode arc smelting is 19-27 kA, the first smelting ingot is cylindrical with the cross section diameter of 640-820 mm, the smelting speed in the second vacuum consumable electrode arc smelting is 18-25 kg/min, and the feeding time is 2-3 h.
2. The method for preparing the TA10 residual material into the cast ingot by using the duplex process as claimed in claim 1, wherein the TA10 residual material in the step one is divided into the riser residual material, the club head residual material, the tube head residual material and the batten residual material according to the form, and then each residual material in the riser residual material, the club head residual material, the tube head residual material and the batten residual material is divided into the high-oxygen residual material and the low-oxygen residual material according to the mass content of oxygen, wherein the high-oxygen residual material is the residual material obtained by processing the TA10 with the mass fraction of oxygen of 0.08-0.2%, and the low-oxygen residual material is the residual material obtained by processing the TA10 with the mass fraction of oxygen of less than 0.08%.
3. The method for preparing the TA10 residual material into the ingot by the duplex process as claimed in claim 2, wherein the material distribution mode in the first step is as follows: the method comprises the following steps of distributing lath residual materials on the lower portion of an electron beam cold hearth furnace to form lower material, distributing two residual materials of pipe head residual materials, rod head residual materials and riser head residual materials on the upper portion of the electron beam cold hearth furnace to form upper material, wherein the upper material is distributed in a layer-by-layer alternating mode according to the sequence of high oxygen and low oxygen; the mass ratio of the medium-high oxygen residual material to the low-oxygen residual material in the upper material and the lower material distributed in the electron beam cold bed furnace is 2: 1.
4. The method for preparing the TA10 scrap into the ingot by using the duplex process as claimed in claim 1, wherein the electron beam cold hearth melting ingot in step one is a slab ingot with a length of 1350mm by a width of 250mm, a slab ingot with a length of 1050mm by a width of 250mm or a cylindrical ingot with a cross-sectional diameter of 620 mm.
5. The method of claim 4, wherein the TA10 scrap is prepared into ingot by twin process, wherein the electron beam cold hearth melting ingot is 1350mm long by 250mm wide slab or 1050mm long by 250mm wide slab, and the slab is cut into two parts along its length and welded into consumable electrode in vacuum consumable electrode arc furnace.
6. The method for preparing the TA10 residual material into the ingot by the duplex process as claimed in claim 1, wherein the vacuum degree in the vacuum consumable electrode arc furnace in the two times of vacuum consumable electrode arc melting in the step two is less than 5Pa, and the gas leakage rate is less than 0.6 Pa/min.
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