CN112921196B - Preparation method of corrosion-resistant Ti35 titanium alloy ingot - Google Patents

Preparation method of corrosion-resistant Ti35 titanium alloy ingot Download PDF

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CN112921196B
CN112921196B CN202110101726.4A CN202110101726A CN112921196B CN 112921196 B CN112921196 B CN 112921196B CN 202110101726 A CN202110101726 A CN 202110101726A CN 112921196 B CN112921196 B CN 112921196B
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titanium alloy
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CN112921196A (en
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李欢
吴金平
赵恒章
张于胜
刘承泽
陈曦
赵恺
姬坤海
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Xian Rare Metal Materials Research Institute Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/22—Remelting metals with heating by wave energy or particle radiation
    • C22B9/228—Remelting metals with heating by wave energy or particle radiation by particle radiation, e.g. electron beams
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium

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Abstract

The invention discloses a preparation method of a corrosion-resistant Ti35 titanium alloy ingot, which comprises the following steps: firstly, preparing Ti powder and Ta powder according to the design components of a target product corrosion-resistant Ti35 titanium alloy ingot; cleaning and uniformly mixing Ti powder and Ta powder, pressing by using a cold isostatic press to obtain an alloy blank, and then sintering in vacuum at 1200 ℃ to obtain an intermediate alloy blank; thirdly, mixing the intermediate alloy blank and the sponge titanium according to a certain proportion, putting the mixture into an electron beam smelting furnace, and smelting the mixture in a high vacuum mode to obtain the corrosion-resistant Ti35 titanium alloy ingot. The corrosion-resistant Ti35 titanium alloy ingot is prepared by adopting an electron beam cold bed smelting method, the main problems of poor component uniformity, low ingot yield, risk of tantalum non-melting blocks and the like of the corrosion-resistant Ti35 titanium alloy ingot are solved, the metallurgical defects of non-melting blocks formed by high-melting-point Ta elements, poor transverse and longitudinal component non-uniformity of the ingot and the like are effectively controlled and avoided, and the method is suitable for key equipment for spent fuel post-treatment.

Description

Preparation method of corrosion-resistant Ti35 titanium alloy ingot
Technical Field
The invention belongs to the technical field of titanium alloy processing, and particularly relates to a preparation method of a corrosion-resistant Ti35 titanium alloy ingot.
Background
The Ti35 titanium alloy is a Ti-Ta binary alloy, has excellent corrosion resistance, crevice corrosion resistance and strong regeneration capability of an oxide film in a simulated solution of nuclear spent fuel, and shows better corrosion resistance and adaptability than high-purity austenitic stainless steel, so that Ti3 titanium alloy has the advantages of high corrosion resistance, high corrosion resistance and high corrosion resistance, high performance and the likeThe 5 titanium alloy has become a candidate material of key equipment for nuclear spent fuel reprocessing engineering. Because tantalum has a high melting point (2996 ℃), high density (16.6 g/cm)3) Titanium has a low melting point (1668 ℃ C.) and a low density (4.5 g/cm)3) The metal elements are difficult to alloy by using a common smelting process, and high-density impurities are easily formed in the ingot to influence the quality of the titanium alloy ingot, so that the defect of a high-melting-point Ta non-melting block is easily formed. The current smelting method of Ti35 titanium alloy ingots mainly comprises vacuum consumable arc (VAR) multiple smelting and powder metallurgy. The former has the disadvantages that the quality requirements of raw materials and consumable electrodes are high, and impurities and inclusions contained in the raw materials and the consumable electrodes can directly enter the cast ingot and cannot be effectively stripped, so that the obtained Ti35 titanium alloy cast ingot has metallurgical defects of high-density inclusions, low-density inclusions, macro segregation and the like; the latter has the main disadvantages of extremely difficult large-scale preparation, high cost and limited application.
Melting materials in an electron beam cold bed melting (EB) furnace are completely separated from ingot casting solidification, and a refining and purifying area is arranged, wherein melting and refining are carried out in a cold bed, and solidification is carried out in a crystallizer; therefore, impurities with high and low densities can be removed, and the purification effect is realized; the EB furnace smelting chamber has relatively high vacuum degree (0.01-1.0 Pa) and smelting temperature which is about 100 ℃ higher than that of VAR smelting, so that the gas impurity removal effect is obvious; the EB furnace can be arranged according to the position of the electron beam gun, and ingot casting specifications (such as a cylinder, a square, a ring and the like) are designed in a diversified way. However, no report on the production of Ti35 titanium alloy by EB furnace smelting is found at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a corrosion-resistant Ti35 titanium alloy ingot aiming at the defects of the prior art. The method adopts an electron beam cold bed smelting method to prepare the corrosion-resistant Ti35 titanium alloy ingot, effectively solves the main problems of poor component uniformity, low ingot yield, risk of tantalum non-melting blocks and the like of the corrosion-resistant Ti35 titanium alloy ingot, and effectively controls and avoids the metallurgical defects of non-melting blocks formed by high-melting-point Ta element, poor transverse and longitudinal component non-uniformity of the ingot and the like.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of a corrosion-resistant Ti35 titanium alloy ingot is characterized by comprising the following steps:
step one, preparing Ti powder and Ta powder according to design components of a target product corrosion-resistant Ti35 titanium alloy ingot;
step two, cleaning the Ti powder and the Ta powder prepared in the step one, uniformly mixing, pressing by using a cold isostatic press to obtain an alloy blank, and then placing the alloy blank in a muffle furnace to perform vacuum sintering at 1200 ℃ to obtain an intermediate alloy blank;
and step three, mixing the intermediate alloy blank obtained in the step two and titanium sponge according to a proportion, then placing the mixture into a water-cooled copper crucible of an electron beam smelting furnace, vacuumizing the electron beam smelting furnace, smelting, stopping beam instantly and cooling to room temperature to obtain the corrosion-resistant Ti35 titanium alloy ingot.
The invention adopts an electron beam cold bed smelting method to prepare the corrosion-resistant Ti35 titanium alloy ingot, and effectively solves the main problems of poor component uniformity, low ingot yield, risk of tantalum non-melting blocks and the like of the corrosion-resistant Ti35 titanium alloy ingot.
The preparation method of the corrosion-resistant Ti35 titanium alloy ingot is characterized in that in the first step, the target product corrosion-resistant Ti35 titanium alloy ingot consists of the following components in percentage by mass: 5.8 to 6.2 percent of Ta, 0.08 to 0.12 percent of O, less than or equal to 0.15 percent of Fe, less than or equal to 0.08 percent of C, less than or equal to 0.03 percent of N, less than or equal to 0.01 percent of H, and the balance of titanium. The Ti35 titanium alloy ingot formed by the components has super-strong corrosion resistance and is suitable for the working condition environment of spent fuel post-treatment.
The preparation method of the corrosion-resistant Ti35 titanium alloy ingot is characterized in that in the step two, the pressing strength is 100 MPa-300 MPa, and the pressure maintaining time is 1 min-10 min. The alloy blank pressed under the optimized pressing technological parameters has good compactness and uniform distribution of tantalum elements.
The preparation method of the corrosion-resistant Ti35 titanium alloy ingot is characterized in that the vacuum degree in the melting chamber of the electron beam melting furnace after the high vacuum pumping in the step three is 10-2Pa～10-3Pa. In the preferred high vacuumUnder the condition of temperature, the overheating temperature is high during electron beam melting, and the liquid state maintaining time is long, so that the communication purification effect of the alloy can be fully performed, and the high-purity Ti35 titanium alloy can be obtained.
The preparation method of the corrosion-resistant Ti35 titanium alloy ingot is characterized in that the smelting in the third step comprises the following specific steps:
step 301, slowly increasing the beam current to 8kW at the rate of 5 mA/s-12 mA/s, keeping for 3min, and simultaneously controlling an electron beam spot to uniformly scan the surface of the material contained in the water-cooled copper crucible for fully preheating;
step 302, slowly increasing the beam current to 10kW at the rate of 5 mA/s-12 mA/s, keeping for 20min, and simultaneously controlling an electron beam spot to uniformly scan the fully preheated material in the step 301 contained in the water-cooled copper crucible so as to preliminarily melt the material to obtain molten alloy;
and 303, slowly increasing the beam current to 18kW at the rate of 5-12 mA/s, keeping for 15min, and controlling the electron beam spot to uniformly scan the molten alloy contained in the water-cooled copper crucible and obtained in the step 302 so as to fully melt the molten alloy.
The optimal smelting process respectively adjusts the power of the melting furnace burden and the power of the heating molten pool, and the molten pool is kept at the required temperature when the melting rate is changed, so that the temperature distribution of the molten pool is ensured to be uniform, and Ti35 titanium alloy ingots with excellent surface quality and crystal structures can be obtained.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts an electron beam cold bed smelting method to prepare the corrosion-resistant Ti35 titanium alloy ingot, and effectively solves the main problems of poor component uniformity, low ingot yield, risk of tantalum non-melting blocks and the like of the corrosion-resistant Ti35 titanium alloy ingot.
2. The corrosion-resistant Ti35 titanium alloy ingot prepared by the method has the advantages of no shrinkage cavity, high purity, effective control and avoidance of metallurgical defects such as non-fusion blocks formed by high-melting-point Ta element and poor transverse and longitudinal component nonuniformity of the ingot.
3. The corrosion-resistant Ti35 titanium alloy ingot prepared by the method has the advantages of uniform distribution of each element, high strength, certain effect of fine crystal strengthening and solid solution strengthening except the crystal boundary of the areas of enriched Ti and Ta, and suitability for key equipment for post-treatment of spent fuel, such as dissolvers and evaporators.
4. The preparation process is controllable, the preparation effect is good, and the preparation method can be widely applied to the field of alloy preparation.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a flow chart of a method for preparing a corrosion-resistant Ti35 titanium alloy ingot according to the present invention.
FIG. 2 is a metallographic structure chart of a Ti35 titanium alloy ingot produced in example 1 of the present invention.
FIG. 3a is an EDS map Ti element distribution diagram of the surface of a Ti35 titanium alloy ingot prepared in example 1 of the present invention.
FIG. 3b is an EDS map Ta element distribution diagram of the surface of a Ti35 titanium alloy ingot prepared in example 1 of the present invention.
FIG. 4 is a metallographic structure chart of a Ti35 titanium alloy ingot produced in example 2 of the present invention.
FIG. 5a is an EDS map Ti element distribution diagram of the surface of a Ti35 titanium alloy ingot prepared in example 2 of the invention.
FIG. 5b is an EDS map Ta element distribution diagram of the surface of a Ti35 titanium alloy ingot prepared in example 2 of the present invention.
FIG. 6 is a metallographic structure chart of a Ti35 titanium alloy ingot produced in example 3 of the present invention.
FIG. 7a is an EDS map Ti element distribution diagram of the surface of a Ti35 titanium alloy ingot prepared in example 3 of the present invention.
FIG. 7b is an EDS map Ta element distribution diagram of the surface of a Ti35 titanium alloy ingot prepared in example 3 of the present invention.
Detailed Description
As shown in FIG. 1, the specific preparation process of the corrosion-resistant Ti35 titanium alloy ingot of the invention is as follows: mixing Ti powder and Ta powder which meet the national standard requirements in proportion, then placing the mixture into a muffle furnace for vacuum sintering at 1200 ℃ after cold isostatic pressing to obtain an intermediate alloy blank, performing density detection and mechanical property (abbreviated as force) detection (plasticity, strength and the like) to prepare the intermediate alloy blank with uniform components, machining (turning and cracking the intermediate alloy blank into particles) to obtain an intermediate alloy block, then mechanically mixing the intermediate alloy block with sponge titanium in proportion and pressing the intermediate alloy block into an electrode, performing electron beam melting for multiple times after vacuum welding, and then detecting components, components and corrosion performance to prepare the corrosion-resistant Ti35 titanium alloy cast ingot with uniformly distributed tantalum elements.
Example 1
The method of the embodiment comprises the following steps:
step one, weighing and preparing Ti powder and Ta powder according to the design components of a target product corrosion-resistant Ti35 titanium alloy ingot; the target product corrosion-resistant Ti35 titanium alloy ingot consists of the following components in percentage by mass: 5.8% of Ta, 0.08% of O, 0.01% of Fe, 0.005% of C, 0.01% of N, 0.008% of H and the balance of titanium;
step two, cleaning the Ti powder and the Ta powder prepared in the step one, uniformly mixing, pressing by using a cold isostatic press to obtain an alloy blank, and then placing the alloy blank in a muffle furnace to perform vacuum sintering at 1200 ℃ to obtain an intermediate alloy blank; the pressing strength adopted by pressing is 100MPa, and the pressure maintaining time is 1 min;
step three, mixing the intermediate alloy blank obtained in the step two and the titanium sponge according to a proportion, then placing the mixture into a water-cooled copper crucible of an electron beam smelting furnace, and vacuumizing the electron beam smelting furnace until the vacuum degree in the smelting chamber is 10-2Pa, smelting, stopping beam instantly, and cooling to room temperature to obtain a corrosion-resistant Ti35 titanium alloy ingot; the smelting process comprises the following specific steps:
step 301, slowly increasing the beam current to 8kW at the rate of 5 mA/s-12 mA/s, keeping for 3min, and simultaneously controlling an electron beam spot to uniformly scan the surface of the material contained in the water-cooled copper crucible for fully preheating;
step 302, slowly increasing the beam current to 10kW at the rate of 5 mA/s-12 mA/s, keeping for 20min, and simultaneously controlling an electron beam spot to uniformly scan the fully preheated material in the step 301 contained in the water-cooled copper crucible so as to preliminarily melt the material to obtain molten alloy;
step 303, slowly increasing the beam current to 18kW at the rate of 5 mA/s-12 mA/s, keeping for 15min, and simultaneously controlling an electron beam spot to uniformly scan the molten alloy obtained in the step 302 contained in the water-cooled copper crucible so as to fully melt the molten alloy to obtain a corrosion-resistant Ti35 titanium alloy ingot;
FIG. 2 is a metallographic structure chart of a Ti35 titanium alloy ingot prepared in this example, and it can be seen from FIG. 2 that typical equiaxed grains and grain boundary structures appear in the structure of the Ti35 titanium alloy ingot, and the Ta element is distributed relatively uniformly without tantalum frits.
Fig. 3a is an EDS spectrum Ti element distribution diagram of the surface of the Ti35 titanium alloy ingot prepared in this example, fig. 3b is an EDS spectrum Ta element distribution diagram of the surface of the Ti35 titanium alloy ingot prepared in this example, and it can be seen from fig. 3a and fig. 3b that both Ta element and Ti element in the Ti35 titanium alloy ingot are uniformly distributed and are not locally enriched.
The Ti35 titanium alloy ingot prepared by the embodiment is subjected to a coupon test, a corrosion performance test is carried out for 240 hours at the temperature of 130 ℃ and under the condition of boiling 8mol/L nitric acid solution, and the annual corrosion rate of the Ti35 titanium alloy ingot is lower than 0.1mm/a by extrapolating the corrosion rate result, which shows that the Ti35 titanium alloy ingot prepared by the method has good uniformity of titanium and tantalum elements, high ingot yield, reduced risk of tantalum non-melting blocks and strong corrosion resistance, and can be completely used in a severe high-temperature corrosion environment of spent fuel post-treatment and used as a candidate material of key equipment.
Example 2
Step one, weighing and preparing Ti powder and Ta powder according to the design components of a target product corrosion-resistant Ti35 titanium alloy ingot; the target product corrosion-resistant Ti35 titanium alloy ingot consists of the following components in percentage by mass: 6.02% of Ta, 0.10% of O, 0.01% of Fe, 0.005% of C, 0.003% of N, 0.0009% of H and the balance of titanium;
step two, cleaning the Ti powder and the Ta powder prepared in the step one, uniformly mixing, pressing by using a cold isostatic press to obtain an alloy blank, and then placing the alloy blank in a muffle furnace to perform vacuum sintering at 1200 ℃ to obtain an intermediate alloy blank; the pressing strength adopted by the pressing is 250MPa, and the pressure maintaining time is 8 min;
step three, mixing the intermediate alloy blank obtained in the step two and the titanium sponge according to a proportion, then placing the mixture into a water-cooled copper crucible of an electron beam smelting furnace, and vacuumizing the electron beam smelting furnace until the vacuum degree in the smelting chamber is 10-3Pa, smelting, stopping beam instantly, and cooling to room temperature to obtain a corrosion-resistant Ti35 titanium alloy ingot; the smelting process comprises the following specific steps:
step 301, slowly increasing the beam current to 8kW at the rate of 5 mA/s-12 mA/s, keeping for 3min, and simultaneously controlling an electron beam spot to uniformly scan the surface of the material contained in the water-cooled copper crucible for fully preheating;
step 302, slowly increasing the beam current to 10kW at the rate of 5 mA/s-12 mA/s, keeping for 20min, and simultaneously controlling an electron beam spot to uniformly scan the fully preheated material in the step 301 contained in the water-cooled copper crucible so as to preliminarily melt the material to obtain molten alloy;
step 303, slowly increasing the beam current to 18kW at the rate of 5 mA/s-12 mA/s, keeping for 15min, and simultaneously controlling an electron beam spot to uniformly scan the molten alloy obtained in the step 302 contained in the water-cooled copper crucible so as to fully melt the molten alloy to obtain a corrosion-resistant Ti35 titanium alloy ingot;
FIG. 4 is a metallographic structure chart of a Ti35 titanium alloy ingot prepared in this example, and it can be seen from FIG. 4 that typical equiaxed grains and grain boundary structures appear in the structure of the Ti35 titanium alloy ingot, and the Ta element is distributed relatively uniformly without tantalum frits.
Fig. 5a is an EDS spectrum Ti element distribution diagram of the surface of the Ti35 titanium alloy ingot prepared in this example, fig. 5b is an EDS spectrum Ta element distribution diagram of the surface of the Ti35 titanium alloy ingot prepared in this example, and it can be seen from fig. 5a and 5b that both Ta element and Ti element in the Ti35 titanium alloy ingot are uniformly distributed and are not locally enriched.
The Ti35 titanium alloy ingot prepared by the embodiment is subjected to a coupon test, a corrosion performance test is carried out for 240 hours at the temperature of 130 ℃ and under the condition of boiling 8mol/L nitric acid solution, and the annual corrosion rate of the Ti35 titanium alloy ingot is lower than 0.1mm/a by extrapolating the corrosion rate result, which shows that the Ti35 titanium alloy ingot prepared by the method has good uniformity of titanium and tantalum elements, high ingot yield, reduced risk of tantalum non-melting blocks and strong corrosion resistance, and can be completely used in a severe high-temperature corrosion environment of spent fuel post-treatment and used as a candidate material of key equipment.
Example 3
Step one, weighing and preparing Ti powder and Ta powder according to the design components of a target product corrosion-resistant Ti35 titanium alloy ingot; the target product corrosion-resistant Ti35 titanium alloy ingot consists of the following components in percentage by mass: 6.20% of Ta, 0.12% of O, 0.15% of Fe, 0.08% of C, 0.03% of N, 0.01% of H and the balance of titanium;
step two, cleaning the Ti powder and the Ta powder prepared in the step one, uniformly mixing, pressing by using a cold isostatic press to obtain an alloy blank, and then placing the alloy blank in a muffle furnace to perform vacuum sintering at 1200 ℃ to obtain an intermediate alloy blank; the pressing strength adopted by the pressing is 300MPa, and the pressure maintaining time is 10 min;
step three, mixing the intermediate alloy blank obtained in the step two and the titanium sponge according to a proportion, then placing the mixture into a water-cooled copper crucible of an electron beam smelting furnace, and vacuumizing the electron beam smelting furnace until the vacuum degree in the smelting chamber is 10-3Pa, smelting, stopping beam instantly, and cooling to room temperature to obtain a corrosion-resistant Ti35 titanium alloy ingot; the smelting process comprises the following specific steps:
step 301, slowly increasing the beam current to 8kW at the rate of 5 mA/s-12 mA/s, keeping for 3min, and simultaneously controlling an electron beam spot to uniformly scan the surface of an alloy blank contained in a water-cooled copper crucible for fully preheating;
step 302, slowly increasing the beam current to 10kW at the rate of 5 mA/s-12 mA/s, keeping for 20min, and simultaneously controlling an electron beam spot to uniformly scan the alloy blank which is fully preheated in the step 301 and is placed in a water-cooled copper crucible, so that the alloy blank is preliminarily melted to obtain molten alloy;
step 303, slowly increasing the beam current to 18kW at the rate of 5 mA/s-12 mA/s, keeping for 15min, and simultaneously controlling an electron beam spot to uniformly scan the molten alloy obtained in the step 302 contained in the water-cooled copper crucible so as to fully melt the molten alloy to obtain a corrosion-resistant Ti35 titanium alloy ingot;
FIG. 6 is a metallographic structure chart of a Ti35 titanium alloy ingot prepared in this example, and it can be seen from FIG. 6 that typical equiaxed grains and grain boundary structures appear in the structure of the Ti35 titanium alloy ingot, and the Ta element is distributed relatively uniformly without tantalum frits.
Fig. 7a is an EDS spectrum Ti element distribution diagram of the surface of the Ti35 titanium alloy ingot prepared in this example, fig. 7b is an EDS spectrum Ta element distribution diagram of the surface of the Ti35 titanium alloy ingot prepared in this example, and it can be seen from fig. 7a and 7b that both Ta element and Ti element in the Ti35 titanium alloy ingot are uniformly distributed and are not locally enriched.
The Ti35 titanium alloy ingot prepared by the embodiment is subjected to a coupon test, a corrosion performance test is carried out for 240 hours at the temperature of 130 ℃ and under the condition of boiling 8mol/L nitric acid solution, and the annual corrosion rate of the Ti35 titanium alloy ingot is lower than 0.1mm/a by extrapolating the corrosion rate result, which shows that the Ti35 titanium alloy ingot prepared by the method has good uniformity of titanium and tantalum elements, high ingot yield, reduced risk of tantalum non-melting blocks and strong corrosion resistance, and can be completely used in a severe high-temperature corrosion environment of spent fuel post-treatment and used as a candidate material of key equipment.
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 (3)

1. A preparation method of a corrosion-resistant Ti35 titanium alloy ingot is characterized by comprising the following steps:
step one, preparing Ti powder and Ta powder according to design components of a target product corrosion-resistant Ti35 titanium alloy ingot;
step two, cleaning the Ti powder and the Ta powder prepared in the step one, uniformly mixing, pressing by using a cold isostatic press to obtain an alloy blank, and then placing the alloy blank in a muffle furnace to perform vacuum sintering at 1200 ℃ to obtain an intermediate alloy blank;
step three, mixing the intermediate alloy blank obtained in the step two and titanium sponge according to a proportion, then placing the mixture into a water-cooled copper crucible of an electron beam smelting furnace, vacuumizing the electron beam smelting furnace, smelting, stopping beam instantly and cooling to room temperature to obtain a corrosion-resistant Ti35 titanium alloy ingot; the vacuum degree in the smelting chamber of the electron beam smelting furnace after high vacuum pumping is 10-2Pa~10-3Pa；
The smelting process comprises the following specific steps:
step 301, slowly increasing the beam current to 8kW at the rate of 5 mA/s-12 mA/s, keeping for 3min, and simultaneously controlling an electron beam spot to uniformly scan the surface of the material contained in the water-cooled copper crucible for fully preheating;
step 302, slowly increasing the beam current to 10kW at the rate of 5 mA/s-12 mA/s, keeping for 20min, and simultaneously controlling an electron beam spot to uniformly scan the fully preheated material in the step 301 contained in the water-cooled copper crucible so as to preliminarily melt the material to obtain molten alloy;
and 303, slowly increasing the beam current to 18kW at the rate of 5-12 mA/s, keeping for 15min, and controlling the electron beam spot to uniformly scan the molten alloy contained in the water-cooled copper crucible and obtained in the step 302 so as to fully melt the molten alloy.
2. The method for preparing the corrosion-resistant Ti35 titanium alloy ingot according to claim 1, wherein the target product corrosion-resistant Ti35 titanium alloy ingot in the first step consists of the following components in percentage by mass: 5.8 to 6.2 percent of Ta, 0.08 to 0.12 percent of O, less than or equal to 0.15 percent of Fe, less than or equal to 0.08 percent of C, less than or equal to 0.03 percent of N, less than or equal to 0.01 percent of H, and the balance of titanium.
3. The method for preparing the corrosion-resistant Ti35 titanium alloy ingot according to claim 1, wherein the pressing strength used in the step two is 100 MPa-300 MPa, and the pressure maintaining time is 1 min-10 min.
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