CN113337743B - Preparation method of Ti-1023 alloy cast ingot with specification of phi 720mm - Google Patents

Preparation method of Ti-1023 alloy cast ingot with specification of phi 720mm Download PDF

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CN113337743B
CN113337743B CN202110599856.5A CN202110599856A CN113337743B CN 113337743 B CN113337743 B CN 113337743B CN 202110599856 A CN202110599856 A CN 202110599856A CN 113337743 B CN113337743 B CN 113337743B
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CN113337743A (en
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刘向宏
吴明
付杰
何永胜
史蒲英
王凯旋
王涛
王建国
张丰收
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Western Superconducting Technologies 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
    • 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
    • B22D7/005—Casting ingots, e.g. from ferrous metals from non-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
    • C22B9/20—Arc remelting
    • 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 relates to a preparation method of a Ti-1023 alloy cast ingot with the specification of phi 720mm, which specifically comprises the following steps: s1, pressing an electrode block: selecting titanium sponge, VAlFe, VAl and Al bean alloy, uniformly mixing, and pressing into an electrode block; s2, welding an electrode: welding the electrode block obtained by pressing in the step S1 into a consumable electrode for smelting in a plasma welding box under the protection of argon; s3, ingot casting and smelting: and (3) placing the electrode obtained in the step (S2) into a vacuum consumable arc furnace, and sequentially smelting for three times to obtain a Ti-1023 alloy cast ingot with the specification of phi 720 mm. The method reduces the segregation of Fe element; the Fe element range of the Ti-1023 alloy cast ingot prepared by the method can be controlled within 0.3 percent (wt), and meanwhile, the phi 350mm specification large-specification bar prepared by the cast ingot has no beta spots, and the mechanical property meets the aerospace technical standard.

Description

Preparation method of Ti-1023 alloy cast ingot with specification of phi 720mm
Technical Field
The invention belongs to the technical field of titanium alloy processing, and particularly relates to a preparation method of a Ti-1023 alloy cast ingot with the specification of phi 720 mm.
Background
The titanium alloy has excellent specific strength, specific stiffness, corrosion resistance and other properties, and is widely applied to the field of aerospace, wherein Ti-10V-2Fe-3Al (Ti-1023) is widely used for producing large-size key force-bearing components such as aircraft landing gears and the like due to the excellent properties such as high strength, high fracture toughness, high hardenability and the like. At present, ti-1023 alloy cast ingots are mostly prepared by VAR vacuum melting, more Fe elements are added, solidification segregation is inevitably generated in the cast ingot solidification process, areas without alpha phase or with rare alpha phase, namely beta spots, often appear in the cast ingot core, and the phenomenon has great influence on the fatigue performance of components. With the development of the aviation industry, the requirement of large-scale titanium alloy components for engineering is further improved, and large-scale ingots are the basis of large-scale component preparation, so that the preparation of large-scale ingots is urgent. In the prior art, constant-melting-speed smelting is generally adopted, the depth of a molten pool is rapidly increased in the smelting process, and the depth of the molten pool is not reduced until feeding begins, so that the molten pool is deep before the ingot is finally tripped, stirring and liquid phase supplement are lacked after the ingot is tripped, and the segregation of the upper half part of the ingot is serious. Because the titanium alloy has low thermal conductivity, and the segregation of Fe element is further aggravated after the specification of the cast ingot is further increased, the preparation of the high-uniformity and ultra-large specification Ti-1023 alloy cast ingot becomes a technical bottleneck in the material field.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a Ti-1023 alloy cast ingot with the specification of phi 720mm, which provides an ingot smelting method controlled by a smelting speed reduction rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a Ti-1023 alloy cast ingot with the specification of phi 720mm is characterized by comprising the following steps:
s1, pressing an electrode block: selecting titanium sponge, VAlFe, VAl and Al bean alloy, uniformly mixing, and pressing into an electrode block;
s2, welding an electrode: welding the electrode block obtained by pressing in the step S1 into a consumable electrode for smelting in a plasma welding box under the protection of argon;
s3, ingot casting and smelting: and (3) placing the electrode obtained in the step (S2) into a vacuum consumable arc furnace, and sequentially smelting for three times to obtain a Ti-1023 alloy cast ingot with the specification of phi 720 mm.
Furthermore, the weight percentage ratio of the alloy of each raw material in the step S1 is Ti-10V-2Fe-3Al.
Further, in the step S3, current control is adopted for the first melting of the three times of melting, constant melting speed control is adopted for the second melting, and melting speed reduction and constant melting speed control are adopted for the third melting.
Further, the smelting parameters controlled by current for the first smelting are as follows: the air leakage rate is controlled below 1.0Pa/min, the smelting current is 10.0 kA-20.0 kA, the arc stabilizing current is direct current 8.0-20.0A, and the smelting voltage is 29-37V.
Further, the smelting parameters of the second smelting adopting constant smelting speed control are as follows: the air leakage rate is controlled below 0.8Pa/min, the smelting speed is 8 kg/min-14 kg/min, the arc stabilizing current is 10-30A, and the smelting voltage is 32-38V.
Further, the smelting parameters of the third smelting adopting the smelting speed reduction control are as follows: the air leakage rate is controlled below 0.60Pa/min.
Further, the smelting period of the third smelting is divided into five stages, and smelting is carried out at different smelting speeds: in the first stage, smelting is carried out by adopting a constant smelting speed method, the smelting speed is 12 kg/min-18 kg/min, the arc stabilizing current is 20-26A, and the smelting voltage is 34-38V; the second stage adopts a method of reducing the melting speed to carry out melting, and the reduction rate of the melting speed is controlled to be 0.15kg/min 2 The following; in the third stage, smelting is carried out by adopting a constant smelting speed method, the smelting speed is 8 kg/min-12 kg/min, the arc stabilizing current is 15-20A, and the smelting voltage is 30-34V; the fourth stage adopts a melting speed reduction method to carry out melting, and the melting speed reduction rate is controlled to be 0.1kg/min 2 The following; and in the fifth stage, smelting is carried out by adopting a constant smelting speed method until feeding is carried out, wherein the smelting speed is 4 kg/min-7 kg/min, the arc stabilizing current is 9-15A, and the smelting voltage is 26-32V.
Further, the crucible specification adopted in the third melting in the step S3 is gradually increased.
Further, after each melting in the step S3, the cast ingot is subjected to a flat head treatment, and then turned around, and then the next melting is performed.
Compared with the prior art, the invention has the following beneficial effects:
the method is used for preparing Ti-1023 alloy ingots with the specification of phi 720mm and uniform components, and provides an ingot smelting method controlled by the reduction rate of the smelting speed.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a relationship between the extreme difference of Fe element and the specification of ingot in the example;
FIG. 2 is a photomicrograph of a prior art ingot made bar using a constant melt rate process;
FIG. 3 is a low magnification photograph of a bar made from an ingot in the constant melting rate + decreasing melting rate process of the embodiment;
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and examples.
A preparation method of a Ti-1023 alloy cast ingot with the specification of phi 720mm is characterized by comprising the following steps:
s1, pressing an electrode block: selecting titanium sponge, VAlFe, VAl and Al bean alloy, uniformly mixing, and pressing into an electrode block;
s2, welding an electrode: welding the electrode block obtained by pressing in the step S1 into a consumable electrode for smelting in a plasma welding box under the protection of argon;
s3, ingot casting and smelting: and (3) placing the electrode obtained in the step (S2) in a vacuum consumable arc furnace, and sequentially smelting for three times to obtain a Ti-1023 alloy cast ingot with the specification of phi 720 mm.
Furthermore, the weight percentage ratio of the alloy of each raw material in the step S1 is Ti-10V-2Fe-3Al.
Further, in the step S3, current control is adopted for the first melting of the three times of melting, constant melting speed control is adopted for the second melting, and melting speed reduction and constant melting speed control are adopted for the third melting.
Further, the first smelting adopts current-controlled smelting parameters as follows: the air leakage rate is controlled below 1.0Pa/min, the smelting current is 10.0 kA-20.0 kA, the arc stabilizing current is 8.0-20.0A, and the smelting voltage is 29-37V.
Further, the smelting parameters of the second smelting adopting constant smelting speed control are as follows: the air leakage rate is controlled below 0.8Pa/min, the smelting speed is 8 kg/min-14 kg/min, the arc stabilizing current is 10-30A, and the smelting voltage is 32-38V.
Further, the smelting parameters of the third smelting adopting the smelting speed reduction control are as follows: the air leakage rate is controlled below 0.60Pa/min.
Further, the smelting period of the third smelting is divided into five stages, and the five stages are respectively adoptedSmelting at different smelting speeds: in the first stage, smelting is carried out by adopting a constant smelting speed method, the smelting speed is 12 kg/min-18 kg/min, the arc stabilizing current is 20-26A, and the smelting voltage is 34-38V; the second stage adopts a method of reducing the melting speed to carry out melting, and the reduction rate of the melting speed is controlled to be 0.15kg/min 2 The following; in the third stage, smelting is carried out by adopting a constant smelting speed method, the smelting speed is 8 kg/min-12 kg/min, the arc stabilizing current is 15-20A, and the smelting voltage is 30-34V; the fourth stage adopts a melting speed reduction method to carry out melting, and the melting speed reduction rate is controlled to be 0.1kg/min 2 The following; and in the fifth stage, smelting is carried out by adopting a constant smelting speed method until feeding is carried out, wherein the smelting speed is 4 kg/min-7 kg/min, the arc stabilizing current is 9-15A, and the smelting voltage is 26-32V.
Further, the crucible specification adopted in the third melting in the step S3 is gradually increased.
Further, after each melting in the step S3, the cast ingot is subjected to a flat head treatment, and then turned around, and then the next melting is performed.
The following is described with reference to specific process procedures:
example 1:
s1, pressing an electrode block: according to the proportion of the alloy, ti-10V-2Fe-3Al (Wt%), sponge titanium, VAlFe, VAl and Al bean alloy are selected for pressing an electrode block, the sponge titanium and the intermediate alloy are picked before pressing to ensure the quality of raw materials, and the picked raw materials are uniformly mixed and then pressed on an oil press to form the electrode block;
s2, welding an electrode: welding the electrode block obtained by pressing in the step S1 into a consumable electrode for smelting in a plasma welding box under the protection of argon;
s3, ingot casting and smelting: and (3) placing the electrode obtained in the step (S2) in a vacuum consumable arc furnace, and sequentially carrying out three times of smelting:
and (3) carrying out first current control smelting on the consumable electrode obtained in the step (S2), wherein a crucible with the diameter of 560mm is adopted for the first smelting, the gas leakage rate is 0.9Pa/min, the smelting current is 19kA, the arc stabilizing current is direct current 18A, the smelting voltage is 36V, and flat head treatment is carried out on a lathe after the smelting is finished.
And carrying out secondary constant melting speed control melting on the 560 mm-diameter cast ingot obtained by the primary melting, turning around and welding the cast ingot needing flat head treatment in the primary melting process, adopting a 640 mm-diameter crucible, wherein the gas leakage rate in the melting process is 0.7Pa/min, the melting speed is 13kg/min, the arc stabilizing current is alternating current 28A, the melting voltage is 37V, and carrying out flat head treatment on a lathe after the melting is finished.
And carrying out third melting speed reduction and constant melting speed controlled melting on the cast ingot with the specification of phi 640mm obtained by secondary melting, turning around and assembling and welding the cast ingot which needs to be subjected to flat head treatment in the secondary melting process, and adopting a crucible with the specification of phi 720mm, wherein the air leakage rate in the melting process is 0.60Pa/min. After the normal smelting period begins, the smelting speed in the first stage is 18kg/min, the arc stabilizing current is alternating current 26A, and the smelting voltage is 37V; after smelting 800kg, the second stage of smelting is started, and the reduction rate of the smelting speed in the stage is 0.15kg/min 2 After the mode is adopted to continue smelting for 40min, the third stage of smelting is started; the third stage has the melting speed of 12kg/min, the arc stabilizing current of 19A and the melting voltage of 34V; the fourth stage adopts melting at a reduced melting speed, and the melting rate is reduced by 0.1kg/min 2 Starting the fifth stage of smelting after 50min of smelting; in the fifth stage, the melting speed is 7kg/min, the arc stabilizing current is alternating current 15A, and the melting voltage is 31V.
The method adopts a step-down melting speed method, a first stage adopts a larger constant melting speed, a molten pool can be quickly established, the depth of the molten pool is quickly increased, and the molten pool is in a full state; secondly, in order to avoid continuous and rapid increase of the depth of the molten pool and excessive reduction of the melting speed to increase the solidification speed of the edge part, wrapping the liquid phase below the molten pool, and reducing the melting speed to a proper range in a second stage by adopting a proper ratio; keeping the current melting speed, entering a third stage constant melting speed melting stage, and slowly increasing the depth of a molten pool until a stable state is reached; in order to further reduce the depth of the molten pool before feeding, the fourth stage adopts a melting speed reduction method to carry out melting, and the melting speed is reduced to a proper melting speed which can maintain the molten pool to the edge; and then the melting speed is adopted to enter a fifth stage constant melting speed melting stage until feeding is entered.
The Ti-1023 alloy ingot with the specification of phi 720mm prepared by the steps has the extremely poor Fe element of 0.26 percent (wt), and after the specification of the ingot is further increased, the segregation of the Fe element is not further increased, but is lower than a normal value, as shown in figure 1; forging the alloy bar into a bar with the specification of phi 350mm, and carrying out solid solution aging heat treatment inspection at 25 ℃ below a transformation point, wherein the high-magnification structure of the bar meets the requirements of AMS4986B aerospace technical specification standard, the mechanical properties of the alloy bar are tested, wherein sigma B =1140Mpa, sigma 0.2=1029Mpa, A =8.0%, Z =30%, KIC =61.2Mpam1/2, sigma B1103 Mpa, sigma 0.2 1000Mpa, A6%, Z10% and KIC 60.0Mpam1/2, which meet the requirements of AMS4986B standard. Finally, a phi 720mm specification Ti-1023 cast ingot with uniform components is obtained, as shown in figures 2 and 3, a large-specification bar prepared by the cast ingot has no beta spot when being checked at the temperature of beta-25 ℃, and the mechanical property of the bar meets the aerospace technical standard.
Example 2:
s1, pressing an electrode block: according to the proportion of the alloy, ti-10V-2Fe-3Al (Wt%), sponge titanium, VAlFe, VAl and Al bean alloy are selected for pressing an electrode block, the sponge titanium and the intermediate alloy are picked before pressing to ensure the quality of raw materials, and the picked raw materials are uniformly mixed and then pressed on an oil press to form the electrode block;
s2, welding an electrode: welding the electrode block obtained by pressing in the step S1 into a consumable electrode for smelting in a plasma welding box under the protection of argon;
s3, ingot casting and smelting: and (3) placing the electrode obtained in the step (S2) in a vacuum consumable arc furnace, and sequentially carrying out three times of smelting:
and (3) carrying out first current control smelting on the consumable electrode obtained in the step (S2), wherein a crucible with the diameter of 560mm is adopted for the first smelting, the gas leakage rate is 0.7Pa/min, the smelting current is 15kA, the arc stabilizing current is direct current 12A, the smelting voltage is 33V, and flat-headed processing is carried out on a lathe after the smelting is finished.
And carrying out second constant melting speed controlled melting on the 560 mm-diameter cast ingot obtained by the first melting, turning around and welding the cast ingot needing flat head treatment in the first melting process, adopting a 640 mm-diameter crucible, wherein the gas leakage rate in the melting process is 0.5Pa/min, the melting speed is 11kg/min, the arc stabilizing current is 18A, the melting voltage is 34V, and carrying out flat head treatment on a lathe after the melting is finished.
Carrying out third melting speed reduction on the cast ingot with the diameter of 640mm obtained by secondary meltingAnd constant melting speed control smelting, turning around and welding the cast ingot needing flat head treatment in the secondary smelting process, and adopting a crucible with the diameter of 720mm, wherein the air leakage rate in the smelting process is 0.40Pa/min. After the normal smelting period begins, the smelting speed in the first stage is 15kg/min, the arc stabilizing current is alternating current 24A, and the smelting voltage is 36V; after 800kg of smelting is carried out, the second-stage smelting is started, and the reduction rate of the smelting speed in the stage is 0.1kg/min 2 After the mode is adopted to continue smelting for 50min, the third stage of smelting is started; the third stage has the melting speed of 10kg/min, the arc stabilizing current of 17A and the melting voltage of 32V; the fourth stage adopts melting at a reduced melting speed, and the reduction rate of the melting speed is 0.05kg/min 2 After 80min of smelting, starting the fifth stage of smelting; in the fifth stage, the melting speed is 6kg/min, the arc stabilizing current is 12A, and the melting voltage is 29V.
The method adopts a step-down melting speed method, the first stage adopts a larger constant melting speed, a molten pool can be quickly established, the depth of the molten pool is quickly increased, and the full state is achieved; secondly, in order to avoid continuous and rapid rise of the depth of the molten pool on one hand and avoid excessive reduction of the melting speed on the other hand, which leads to increase of the solidification speed of the edge part, wrapping the liquid phase below the molten pool, and reducing the melting speed to a proper range in a second stage by adopting a proper ratio; keeping the current melting speed, entering a third stage constant melting speed melting stage, and slowly increasing the depth of a molten pool until the molten pool reaches a stable state; in order to further reduce the depth of the molten pool before feeding, the fourth stage adopts a method of reducing the melting speed to smelt until the proper melting speed from the molten pool to the edge can be maintained; and then the melting speed is adopted to enter a constant melting speed melting stage of the fifth stage until feeding is entered.
The Ti-1023 alloy ingot with the specification of phi 720mm prepared by the steps has the Fe element range of 0.24 percent (wt), and after the specification of the ingot is further increased, the segregation of the Fe element is not further increased, but is lower than a normal value, as shown in figure 1; forging the alloy bar into a bar with the specification of phi 350mm, and carrying out solid solution aging heat treatment inspection at 25 ℃ below a transformation point, wherein the high-power structure of the bar meets the AMS4986B aerospace technical specification standard requirements, the mechanical properties of the alloy bar are tested, namely sigma B =1170Mpa, sigma 0.2=1080Mpa, A =9.0%, Z =45%, KIC =63.5Mpam1/2, sigma B which meets the AMS4986B standard requirements is more than or equal to 1103Mpa, sigma 0.2 is more than or equal to 1000Mpa, A is more than or equal to 6%, Z is more than or equal to 10%, and KIC is more than or equal to 60.0Mpam1/2. Finally, a phi 720mm specification Ti-1023 cast ingot with uniform components is obtained, as shown in figures 2 and 3, a large-specification bar prepared by the cast ingot has no beta spot when being checked at the temperature of beta-25 ℃, and the mechanical property of the bar meets the aerospace technical standard.
Example 3:
s1, pressing an electrode block: according to the proportion of the alloy, ti-10V-2Fe-3Al (Wt%), sponge titanium, VAlFe, VAl and Al bean alloy are selected for pressing an electrode block, the sponge titanium and the intermediate alloy are picked before pressing to ensure the quality of raw materials, and the picked raw materials are uniformly mixed and then pressed on an oil press to form the electrode block;
s2, welding an electrode: welding the electrode block obtained by pressing in the step S1 into a consumable electrode for smelting in a plasma welding box under the protection of argon;
s3, ingot casting and smelting: and (3) placing the electrode obtained in the step (S2) in a vacuum consumable arc furnace, and sequentially carrying out three times of smelting:
and (3) carrying out first current control smelting on the consumable electrode obtained in the step (S2), wherein a crucible with the diameter of 560mm is adopted for the first smelting, the gas leakage rate is 0.8Pa/min, the smelting current is 15kA, the arc stabilizing current is direct current 12A, the smelting voltage is 33V, and flat-headed processing is carried out on a lathe after the smelting is finished.
And carrying out second constant melting speed controlled melting on the cast ingot with the diameter of 560mm obtained by the primary melting, turning around and welding the cast ingot needing flat head treatment in the primary melting process, adopting a crucible with the diameter of 640mm, wherein the gas leakage rate in the melting process is 0.3Pa/min, the melting speed is 8kg/min, the arc stabilizing current is alternating current 12A, the melting voltage is 32V, and carrying out flat head treatment on a lathe after the melting is finished.
And carrying out third melting speed reduction and constant melting speed controlled melting on the cast ingot with the specification of phi 640mm obtained by secondary melting, turning around and assembling and welding the cast ingot which needs to be subjected to flat head treatment in the secondary melting process, and adopting a crucible with the specification of phi 720mm, wherein the air leakage rate in the melting process is 0.15Pa/min. After the normal smelting period begins, the smelting speed in the first stage is 12kg/min, the arc stabilizing current is 20A, and the smelting voltage is 34V; after 800kg of smelting is carried out, the second-stage smelting is started, and the reduction rate of the smelting speed in the stage is 0.05kg/min 2 After the smelting is continued for 80min in the mode, the third step is startedSection smelting; the third stage has the melting speed of 8kg/min, the arc stabilizing current of 15A and the melting voltage of 30V; the fourth stage adopts melting at a reduced melting speed, and the reduction rate of the melting speed is 0.02kg/min 2 After smelting for 200min, starting the fifth stage of smelting; in the fifth stage, the melting speed is 4kg/min, the arc stabilizing current is 10A, and the melting voltage is 27V.
The method adopts a step-down melting speed method, the first stage adopts a larger constant melting speed, a molten pool can be quickly established, the depth of the molten pool is quickly increased, and the full state is achieved; secondly, in order to avoid continuous and rapid increase of the depth of the molten pool and excessive reduction of the melting speed to increase the solidification speed of the edge part, wrapping the liquid phase below the molten pool, and reducing the melting speed to a proper range in a second stage by adopting a proper ratio; keeping the current melting speed, entering a third stage constant melting speed melting stage, and slowly increasing the depth of a molten pool until the molten pool reaches a stable state; in order to further reduce the depth of the molten pool before feeding, the fourth stage adopts a melting speed reduction method to carry out melting, and the melting speed is reduced to a proper melting speed which can maintain the molten pool to the edge; and then the melting speed is adopted to enter a constant melting speed melting stage of the fifth stage until feeding is entered.
The Ti-1023 alloy ingot with the specification of phi 720mm prepared by the steps has the extremely poor Fe element of 0.22 percent (wt), and after the specification of the ingot is further increased, the segregation of the Fe element is not further increased, but is lower than a normal value, as shown in figure 1; forging the alloy bar into a bar with the specification of phi 350mm, and carrying out solid solution aging heat treatment inspection at a temperature of 25 ℃ below a transformation point, wherein the macroscopic structure of the bar meets the AMS4986B aerospace technical specification standard requirements, the mechanical properties of the alloy bar are tested, namely sigma B =1205Mpa, sigma 0.2=1103Mpa, A =14.0%, Z =54%, KIC =67.6Mpam1/2, and sigma B1103 ≥ Mpa, sigma 0.2 ≥ 1000Mpa, A ≥ 6%, Z ≥ 10%, and KIC ≥ 60.0Mpam1/2, which meet the AMS4986B standard requirements. Finally, a phi 720mm specification Ti-1023 cast ingot with uniform components is obtained, as shown in figures 2 and 3, a large-specification bar prepared by the cast ingot has no beta spot when being checked at the temperature of beta-25 ℃, and the mechanical property of the bar meets the aerospace technical standard.
The above description is merely illustrative of particular embodiments of the invention that enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (7)

1. A preparation method of a Ti-1023 alloy cast ingot with the specification of phi 720mm is characterized by comprising the following steps:
s1, pressing an electrode block: selecting titanium sponge, VAlFe, VAl and Al bean alloy, uniformly mixing, and pressing into an electrode block;
s2, welding an electrode: welding the electrode block obtained by pressing in the step S1 into a consumable electrode for smelting in a plasma welding box under the protection of argon;
s3, ingot casting and smelting: placing the electrode obtained in the step S2 in a vacuum consumable arc furnace, and sequentially carrying out three times of smelting to obtain a Ti-1023 alloy cast ingot with the specification of phi 720mm, wherein the first time of the three times of smelting in the step S3 adopts current control, the second time of smelting adopts constant melting speed control, and the third time of smelting adopts melting speed reduction and constant melting speed control;
the smelting period of the third smelting is divided into five stages, and smelting is carried out at different smelting speeds: in the first stage, smelting is carried out by adopting a constant smelting speed method, the smelting speed is 12 kg/min-18 kg/min, the arc stabilizing current is 20-26A, and the smelting voltage is 34-38V; the second stage adopts a method of reducing the melting speed to carry out melting, and the reduction rate of the melting speed is controlled between 0.05 and 0.15kg/min 2 (ii) a In the third stage, a constant melting speed method is adopted for melting, the melting speed is 8 kg/min-12 kg/min, the arc stabilizing current is alternating current 15-20A, and the melting voltage is 30-34V; the fourth stage adopts a melting speed reduction method to carry out melting, and the melting speed reduction rate is controlled to be 0.02-0.1 kg/min 2 (ii) a In the fifth stage, a constant melting speed method is adopted to carry out melting until feeding, the melting speed is 4kg/min to 7kg/min, the arc stabilizing current is 9 to 15A, and the melting voltage is 26 to 32V.
2. The method of claim 1, wherein the raw materials in step S1 are Ti-10V-2Fe-3Al in a weight percentage ratio of the alloy.
3. The method for preparing the Ti-1023 alloy ingot with the specification of phi 720mm according to claim 1, wherein the first smelting adopts current-controlled smelting parameters of: the air leakage rate is controlled below 1.0Pa/min, the smelting current is 10.0 kA-20.0 kA, the arc stabilizing current is direct current 8.0-20.0A, and the smelting voltage is 29-37V.
4. The method for preparing the Ti-1023 alloy ingot with the specification of phi 720mm according to claim 1, wherein the second smelting adopts smelting parameters controlled by a constant smelting speed as follows: the air leakage rate is controlled below 0.8Pa/min, the smelting speed is 8 kg/min-14 kg/min, the arc stabilizing current is 10-30A, and the smelting voltage is 32-38V.
5. The method for preparing the Ti-1023 alloy ingot with the specification of phi 720mm according to claim 1, wherein the third smelting adopts smelting parameters controlled by the reduced smelting speed as follows: the air leakage rate is controlled below 0.60Pa/min.
6. The method for preparing an ingot of Ti-1023 alloy with the specification of phi 720mm as claimed in claim 1, wherein the crucible specification adopted by the three times of smelting in the step S3 is gradually increased.
7. The method for preparing the Ti-1023 alloy ingot with the specification of phi 720mm as claimed in the step S3, wherein after each smelting in the step S3, the ingot is subjected to a flat head treatment, then is turned around, and then is subjected to the next smelting.
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