KR102299907B1 - THE FORGING DIE INTERNAL HEATING METHOD AND MANUFACTURING METHOD Ti-Al ALLOY INGOT BILLET USING FORGING DIE INTERNAL HEATING METHOD - Google Patents

Abstract

The present invention relates to a forging apparatus of an internal heating method and a method for manufacturing a Ti-Al alloy billet using the same, and more particularly, to a radial forging die inside for manufacturing a Ti-Al alloy billet suitable for manufacturing a rolled plate and forming application parts. A high-frequency induction heating coil is presented in a forging device of an internal heating method, and by using the forging device of an internal heating method, the density of the Ti-Al alloy is lowered and the high-temperature formability is improved by including the beta (β) phase. It relates to a method for manufacturing a Ti-Al alloy billet.

Description

TECHNICAL FIELD

The present invention provides a forging device and an internal heating method capable of forming a Ti-Al alloy billet that can improve high-temperature formability, including beta phase, while lowering the density of Ti-Al alloy for manufacturing rolled plate materials and forming application parts It relates to a method for manufacturing a Ti-Al alloy billet using a heating type forging apparatus.

In general, Ti-Al alloy is a kind of intermetallic compound that is attracting attention as a next-generation lightweight heat-resistant material, and is applied as a material for parts requiring high-temperature characteristics, such as automobile turbochargers or aircraft turbine blades. Ti-Al alloy is a _{two-phase alloy containing about 10% of Ti 3} Al. When manufactured by a conventional solution and solidification method, TiAl(γ)+Ti ₃ Al(α ₂ ) is a layered layer consisting of two phases. An ingot of lamellar structure is obtained. However, these Ti-Al alloys have a problem that only parts can be manufactured through a casting process due to lack of formability at high temperatures.

In addition, the layered structure of Ti-Al is known to provide useful properties for practical use of Ti-Al as a light-weight and high-temperature material due to its excellent fracture toughness, fatigue strength, and creep strength. It is known that the lack of ductility at room temperature is the biggest obstacle to using it as a processing material or casting material such as compression molding. It is known that the biggest cause of this lack of ductility is that delamination occurs at the interface when stress is applied in the direction perpendicular to the lamellar boundary.

In addition, during forging press work for manufacturing Ti-Al alloy ingots into billets, in the case of the prior art, in order to make Ti-Al alloy billets, the ingots are first manufactured through vacuum arc remelting (VAR) equipment and , the ingot melted by vacuum arc remelting (VAR) is produced by forging. At this time, since the Ti-Al alloy must be forged at a high temperature to avoid cracks, it is heated to a temperature of 1400° C. in an electric furnace and then taken out and forged. In this process, when the temperature drops during forging for temperature compensation, it is put into an electric furnace again and heated, then forged and repeatedly performed to manufacture a billet of a desired shape.

However, in the case of the prior art, it is difficult to maintain the temperature of the ingot during the forging operation, and cracks frequently occur during the forging operation due to the temperature drop during the operation.

Korean Patent Registration No. 10-0644880

An object of the present invention is to reduce the addition amount of heavy elements such as niobium (Nb), tungsten (W), etc., which are heavy elements for manufacturing rolled plates and molded application parts, while lowering the density of the Ti-Al alloy in order to solve the above-mentioned conventional problems. It is to provide an internal heating type forging die capable of manufacturing a Ti-Al alloy ingot for a workpiece or a cast material with improved high-temperature formability, including beta phase.

In addition, the invention provides an internal heating method forging die that allows the production of Ti-Al alloy billets by heating the forging die and performing forging so as to easily maintain the temperature of the Ti-Al alloy ingot during the forging operation of manufacturing the Ti-Al alloy billet. An object of the present invention is to provide a method for manufacturing a Ti-Al alloy billet using

In order to achieve the above object, the internal heating type forging apparatus of the present invention includes an alloy ingot having a circular cross section, and a forging die surrounding the alloy ingot, and one side of the forging die faces the alloy ingot and , the other side facing the one side is formed, the left side and the right side of the forging die connecting the one side and the other side are formed, and a high frequency induction heating coil between one side and the other side of the forging die It is characterized in that it is located.

It is preferable that an inclined surface is additionally formed on the left side or the right side between the forging die and the adjacent forging die on the left side and the right side of the forging die.

In the internal heating type forging apparatus of the present invention, the forging die is preferably made of four radially.

In order to achieve another object of the present invention, the method for manufacturing a Ti-Al alloy billet using the forging device of the internal heating method includes (a) a Ti-Al alloy element preparation step, (b) press the prepared Ti-Al alloy element manufacturing a Ti-Al alloy briquette by processing, (c) vacuum arc melting the Ti-Al alloy briquette to produce a Ti-Al alloy ingot, and (d) the Ti-Al alloy briquette with an internal heating forging device and forging an Al alloy ingot to produce a Ti-Al alloy billet.

In the method for manufacturing a Ti-Al alloy billet using an internal heating forging device of the present invention, the step (a) includes titanium (Ti) and aluminum (Al), molybdenum (Mo), niobium (Nb), tungsten (W), chromium (Cr), silicon (Si), carbon (C), or one or more alloying elements selected from these may prepare the Ti-Al alloy element to have a predetermined mixing ratio. More preferably, the Ti-Al alloy element includes the titanium (Ti) 44 at% to 46 at%, the aluminum (Al) 44 at% to 46 at%, and the molybdenum (Mo) 0 as the alloying element more than at% and less than 0.6 at%, more than 0 at% of niobium (Nb) and less than 10 at%, more than 0 at% of tungsten (W) and less than or equal to 5 at%, more than 0 at% of chromium (Cr) and less than or equal to 2 at%, The silicon (Si) 0 at% or more and 1 at% or less, and the carbon (C) 0 at% or more and 1 at% or less selected from the group consisting of any one or more and the balance may be made of a content including other unavoidable impurities.

In the method of manufacturing a Ti-Al alloy billet using an internal heating forging device of the present invention, the step (c) is performed by applying an arc current to an electrode and repeating the vacuum arc melting by vacuum arc remelting. A Ti-Al alloy ingot can be manufactured by repeatedly melting the briquettes three or more times.

When the vacuum arc re-melting is repeated three times in step (c), the Ti-Al alloy briquette is melted by vacuum arc melting and then hardened to prepare a first Ti-Al alloy ingot. , and after cutting the primary Ti-Al alloy ingot in a direction perpendicular to the longitudinal direction and joining through welding, then secondary melting by vacuum arc remelting and hardening to produce a secondary Ti-Al alloy ingot After the secondary melting step, and the secondary Ti-Al alloy ingot is joined through TIG welding, the stub is TIG welded, and then melted and then hardened by the vacuum arc remelting to prepare a tertiary Ti-Al alloy ingot It may include a tertiary melting step.

The Ti-Al alloy ingot manufactured through step (c) has a density of 3.8 g/cm ³ to 4.0 g/cm ³ .

In the method for manufacturing a Ti-Al alloy billet using an internal heating forging device of the present invention, the step (d) includes supplying the Ti-Al alloy ingot to an internal heating forging device, and the internal heating method. The forging die is directly heated in the forging apparatus, and forging the Ti-Al alloy ingot may include manufacturing a Ti-Al alloy billet.

The present invention provides an effect of making it possible to manufacture a Ti-Al alloy billet by heating an internally heated forging die to facilitate maintaining the temperature of the ingot during the forging operation of manufacturing the Ti-Al alloy billet.

In addition, by lowering the amount of heavy elements (Nb, W, etc.) added through the Ti-Al alloy billet manufacturing method using the internal heating type forging die of the present invention, the density of the Ti-Al alloy is lowered, including beta (β) phase By improving the high temperature formability, it provides the effect of making it possible to manufacture a Ti-Al alloy ingot billet for a workpiece or a cast material that can be used for manufacturing rolled sheet materials and molded application parts.

1 is a schematic diagram of an internal heating type forging device according to an embodiment of the present invention.
2 and 3 are flowcharts of a method of manufacturing a Ti-Al alloy billet according to an embodiment of the present invention.
4 is a process diagram of a step (S40) of manufacturing a Ti-Al alloy billet by performing spin forging on the Ti-Al alloy ingot manufactured according to an embodiment of the present invention.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Since the embodiment according to the concept of the present invention may have various changes and may have various forms, specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiment according to the concept of the present invention to a specific disclosed form, and it should be understood that the present invention includes all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle. Other expressions describing the relationship between elements, such as "between" and "immediately between" or "neighboring to" and "directly adjacent to", should be interpreted similarly.

The terms used herein are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as "comprises" or "have" are intended to designate that the described features, numbers, steps, operations, components, parts, or combinations thereof exist, and include one or more other features or numbers. , it is to be understood that it does not preclude the possibility of the presence or addition of steps, operations, components, parts, or combinations thereof.

Hereinafter, the internal heating type forging apparatus of the present invention and the Ti-Al alloy billet manufacturing method using the same will be described in detail with reference to the accompanying exemplary drawings, which as an example, those skilled in the art to which the present invention pertains Since it may be implemented in different forms, the present invention is not limited thereto.

1 shows a forging apparatus of the internal heating method according to an embodiment of the present invention, as shown in FIG. 1 , the forging apparatus 100 of the internal heating method of the present invention is a Ti-Al alloy ingot having a circular cross section ( 10), and a forging die 101 surrounding the Ti-Al alloy ingot 10, wherein a high-frequency induction heating coil 110 is embedded in the forging die 101 and positioned.

The forging die 101 may be composed of two or more plural forging dies radially disposed so as to surround the alloy ingot 10 having a circular cross section inserted into the forging die 10, preferably, the forging die. Two or four (101) are arranged radially.

The forging die 101 has one side 101-1 facing the Ti-Al alloy ingot 10, and the other side 101-2 facing the one side 101-1 is formed, A left side 101-3 and a right side 101-4 of the forging die connecting the one side 101-1 and the other side 101-2 are formed, and the left side and the right side of the forging die are formed. Preferably, an inclined surface 102 is additionally formed on the left side surface 101-3 or the right side surface 101-4 between the forging die and the adjacent forging die.

A high-frequency induction heating coil 110 is built in between one side 101-1 and the other side 101-2 of the forging die, so there is no external heating process using a separate torch for the forging die. (101) is directly heated to perform spinning forging.

The forging device 100 of the internal heating method directly heats the forging die through a high-frequency induction heating coil built into the forging die so that the temperature of the alloy ingot can be easily maintained during the forging operation of manufacturing the Ti-Al alloy billet. and to produce a Ti-Al alloy billet 20 . Thereby, the productivity of the Ti-Al alloy ingot billet 20 is improved by reducing the spinning forging time, and the quality of the manufactured Ti-Al alloy ingot billet is significantly improved.

The forging apparatus 100 of the internal heating method is not limited to a radial forging apparatus, and various forging apparatuses such as a forging apparatus in which a forging die vertically separated according to the shape or characteristic of a billet is disposed may be used.

2 and 3 are flowcharts of a method of manufacturing a Ti-Al alloy billet according to an embodiment of the present invention.

As shown in FIG. 2 , the manufacturing method of the Ti-Al alloy billet includes (a) a Ti-Al alloy element preparation step (S10), (b) press-working the prepared Ti-Al alloy element to form a Ti-Al alloy briquette. Manufacturing step (S20), (c) vacuum arc remelting the Ti-Al alloy briquette to prepare a Ti-Al alloy ingot (S30), (d) forging the Ti-Al alloy ingot to Ti-Al and manufacturing an alloy billet (S40).

The (a) step (S10), including titanium (Ti) and aluminum (Al), molybdenum (Mo), niobium (Nb), tungsten (W), chromium (Cr), silicon (Si) as alloy elements , carbon (C), or one or more alloying elements selected from them to prepare a Ti-Al alloy element to have a predetermined mixing ratio. The Ti-Al alloy element may have a composition of Formula 1 below.

[Formula 1]

Ti-Al-X

Here, X is one selected from molybdenum (Mo), niobium (Nb), tungsten (W), chromium (Cr), silicon (Si), and carbon (C), or two or more selected from these.

The (a) step (S10), the titanium (Ti), aluminum (Al) and alloying elements are titanium (Ti) 44 at% to 46 at%, aluminum (Al) 44 at% to 46 at%, the alloy As elements, molybdenum (Mo) more than 0 at% and less than 0.6 at%, niobium (Nb) more than 0 at% and less than 10 at%, tungsten (W) more than 0 at% and less than 5 at%, chromium (Cr) more than 0 at% 2 at% or less, silicon (Si) more than 0 at% and 1 at% or less, carbon (C) more than 0 at% and 1 at% or less, and the remainder may be prepared to include other unavoidable impurities.

In the present invention, if the alloy is to manufacture a Ti-Al alloy ingot having a composition of Ti-Al-X, about 2% to 10% of the beta (β) phase is required in the entire Ti-Al alloy ingot, if Ti-Al When the content of titanium (Ti) in the alloy element is out of the range of 44 at% to 46 at%, or the content of aluminum (Al) is out of the range of 44 at% to 46 at%, beta (β) phase The ratio is out of the range of 2% to 10%, and as a result, the high temperature formability of the Ti-Al alloy is not improved.

High temperature oxidation resistance is improved through the formation of an oxide film of _{stable aluminum oxide (Al 2} O ₃ ) by adding the niobium (Nb) in an amount of more than 0 at% to 10 at% or less in the Ti-Al alloy element, and Ti-Al It shows the effect of increasing the tensile strength through suppression of high-temperature deformation in the gamma (γ) phase, which is the constituent phase of the alloy. However, when out of the above-described content range, this effect cannot be expected.

By containing the tungsten (W) in an amount of more than 0 at% and 5 at% or less, tungsten (W) is introduced into the Ti-Al alloy to have a state transfer effect of 1 to 12% with the best state transfer effect of 1.12%. is employed, and it is impossible to obtain such a state shift effect outside the above-mentioned range.

When the chromium (Cr) is added in a content ratio of more than 0 at% and 2 at% or less as described above, it provides an effect of increasing the elongation of the gamma (γ) phase, which is the main constituent phase of the Ti-Al alloy. When the addition amount of chromium (Cr) exceeds the range given above, the density of the Ti-Al-X alloy ingot is 3.8 g/cm ³ to 4.0 g/cm ³ .

When the silicon (Si) and carbon (C) are added, fine precipitates are formed at the layered interface at high temperatures, and the formed fine precipitates inhibit layered structure deformation to increase creep strength and allow wide utilization of the phase diagram area. It provides an advantageous effect for control, and it is possible to obtain the effect of refining the lamellar structure. When the Ti-Al alloy element contains more than 0 at% and 1 at% or less of carbon (C) and more than 0 at% and 1 at% or less of silicon (Si), carbon (C) of Ti-Al and silicon ( Si) has the most excellent solid solution strengthening effect.

Referring back to FIG. 2 , the step (b) (S20) is a step of preparing a Ti-Al alloy briquet by press-working the Ti-Al alloy element prepared in the step (a).

containing titanium (Ti) and aluminum (Al), molybdenum (Mo), niobium (Nb), tungsten (W), chromium (Cr), silicon (Si), carbon (C), or at least one alloy selected from these A Ti-Al alloy briquette is manufactured by press working, which consists of a mixture of elements and is press-formed with a Ti-Al alloy sheet having the Ti-Al-X composition shown in Formula 1 above.

(c) step (S30) prepares the Ti-Al alloy ingot by vacuum arc remelting (Vacuum Arc Remelting, VAR) the Ti-Al alloy briquette.

The (c) step (S30) connects one or more Ti-Al alloy briquettes prepared in (b) step (S20) before performing the vacuum arc remelting (VAR) process for the Ti-Al alloy briquettes, and stubs A step (S21) of manufacturing an electrode obtained by welding a stub to a Tig is performed, and a step (S22) of preheating the electrode with a stub to remove moisture from the Tig is performed.

In the step (S21) of manufacturing the electrode, the electrode is manufactured by Tig welding a stub after connecting one or more of the manufactured briquettes.

The process of preheating the electrode (S22) is a process of preheating to a predetermined temperature to remove moisture from the stub and the briquettes connected to the electrode.

In the step (c) (S30), a Ti-Al alloy ingot is prepared by melting the electrode from which moisture has been previously removed, and the prepared electrode is vacuum arced to remove the segregation remaining in the melting process and to homogenize the microstructure. It is characterized in that the Ti-Al alloy ingot is manufactured by repeatedly melting three or more times by remelting (VAR).

The Ti-Al alloy ingot is preferably prepared by melting by vacuum arc remelting (VAR), specifically, in a state close to vacuum by maintaining the ^{ambient atmosphere at 1×10 -5 torr during vacuum arc remelting (VAR).} After making an arc, an arc is generated to melt the alloying elements by applying a current of 200 A to 1,000 A to the electrode of the vacuum arc remelting (VAR) equipment while argon (Ar) gas, an inert gas, is injected again. It is hardened by cooling to prepare a cylindrical Ti-Al alloy ingot.

For example, in the step (S30) of (c), when vacuum arc remelting (VAR) of the electrode is repeatedly performed three times, after melting the electrode made of the Ti-Al alloy briquette by vacuum arc melting The first melting step of hardening to produce a primary Ti-Al alloy ingot, cutting the primary Ti-Al alloy ingot in a direction perpendicular to the longitudinal direction, turning it upside down and joining by TIG welding, and TIG welding the stub A second melting step of producing a secondary Ti-Al alloy ingot by second melting and hardening by vacuum arc remelting (VAR), and bonding the secondary Ti-Al alloy ingot through TIG welding, followed by stub After TIG welding, it can be configured to prepare the Ti-Al alloy ingot, including the tertiary melting step of producing a tertiary Ti-Al alloy ingot by tertiary melting by the vacuum arc remelting (VAR) and then hardening have.

In this way, it is preferable to manufacture a Ti-Al alloy ingot by repeating the ingot melting 2 to 4 times using vacuum arc remelting (VAR), removing impurities and uniformly distributing the homogeneous alloy composition in the ingot.

Here, the Ti-Al alloy ingot prepared through step (c) has a density of 3.8 g/cm ³ to 4.0 g/cm ³ .

Then (d) step (S40) is performed by forging the Ti-Al alloy ingot manufactured through step (c) (S30) to manufacture a Ti-Al alloy ingot billet. At this time, the forging process uses the forging apparatus 100 of the internal heating method of FIG. 1 , the forging dies heat themselves during the forging process to perform spin forging to manufacture a Ti-Al alloy ingot billet.

4 is a process diagram of a step (S40) of manufacturing a Ti-Al alloy billet by performing spin forging of a Ti-Al alloy ingot manufactured according to an embodiment of the present invention, in the forging apparatus 100 of the internal heating method Radial forging is performed so that the forging dies 101 disposed radially are directly heated through the high-frequency induction heating coils 110 therein, so that the Ti-Al alloy billet 20 is manufactured.

In order to investigate the physical properties of the Ti-Al alloy ingot billet manufactured using the internal heating forging device of the present invention, a ternary Ti-Al alloy specimen was prepared under the conditions of Table 1 below, and the prepared specimen was subjected to differential thermal analysis. (differential thermal analysis, DTA) was performed to confirm the phase transformation temperature section of the specimen, and the results are shown in Table 1 below.

division Phase transformation temperature (℃) additive effect Pure Ti 880 - Ti-Al-Nb 1352 Increase in elongation in gamma phase Ti-Al-Cr 1344 Increased oxidation resistance and improved high temperature properties Ti-Al-W 1354 Improvement of fine properties, high phase transformation transfer effect

As shown in Table 1, the Ti-Al alloy billet using the internal heating forging device of the present invention is Ti-Al alloy billet at room temperature of 15° C. to 25° C. The elongation rate of the -Al alloy could be improved, and microstructure control was also possible through additional heat treatment. In addition, as alloying elements in Ti-Al alloys, beta-stabilizing elements niobium (Nb), tungsten (W), and chromium (Cr) ) and the like, it was confirmed that the beta (β) phase region on the phase diagram could be enlarged by moving the temperature of the beta-transus.

As a result of the experiment, when 1 at% element is added, as a beta stabilizing element, molybdenum (Mo) is +0.6%, rhenium (Re) is +0.8%, tungsten (W) is as high as +1.12%. It was found that niobium (Nb) was moved by 0.3%, silicon (Si) by -1.33%, and carbon (C) by -4%. Here, + denoted as a shift value denotes a high Al direction, and - denotes a low Al direction.

In addition, it was confirmed that when tungsten (W) was added during beta stabilization, the highest phase transformation transfer effect was exhibited.

As a result of the investigation of the effect of shifting the state of each element, it was found that the state of tungsten (W) and carbon (C) among the alloying elements also had a large shifting effect.

It is necessary to proceed with alloy design by adding tungsten (W), which has the best effect of moving the phase diagram. It seems that the microstructure can be controlled.

Although the technical spirit of the present invention described above has been specifically described in the preferred embodiment, it should be noted that the embodiment is for the description and not the limitation. In addition, those of ordinary skill in the technical field of the present invention will understand that various embodiments are possible within the scope of the technical spirit of the present invention. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

10: Ti-Al alloy ingot
20: Ti-Al alloy ingot billet
100: forging device of internal heating method
101: forging die
110: high frequency induction heating coil

Claims (11)

delete delete delete (a) Ti-Al alloy element preparation step;
(b) preparing a Ti-Al alloy briquette by pressing the prepared Ti-Al alloy element;
(c) preparing a Ti-Al alloy ingot by vacuum arc melting the Ti-Al alloy briquette;
(d) manufacturing the Ti-Al alloy billet by forging the Ti-Al alloy ingot with an internal heating forging device;
The step (c) may include: a first melting step of melting the Ti-Al alloy briquette by vacuum arc melting and then hardening to prepare a first Ti-Al alloy ingot;
Secondary to manufacture a secondary Ti-Al alloy ingot by cutting the primary Ti-Al alloy ingot in a direction perpendicular to the longitudinal direction, joining through welding, and then secondary melting by vacuum arc remelting and hardening melting step; and
A tertiary melting step of bonding the secondary Ti-Al alloy ingot through TIG welding, TIG welding the stub, and then melting and curing the tertiary Ti-Al alloy ingot by tertiary melting by the vacuum arc re-melting; Ti-Al alloy billet manufacturing method using an internal heating type forging device comprising a. 5. The method of claim 4,
The step (a) is,
containing titanium (Ti) and aluminum (Al), molybdenum (Mo), niobium (Nb), tungsten (W), chromium (Cr), silicon (Si), carbon (C), or at least one alloy selected from these A method for manufacturing a Ti-Al alloy billet using an internal heating forging device, characterized in that preparing the Ti-Al alloy element so that the element has a predetermined mixing ratio. 6. The method of claim 5,
The Ti-Al alloy element is
The titanium (Ti) 44 at% to 46 at%, the aluminum (Al) 44 at% to 46 at%, the molybdenum (Mo) 0 at% or less as the alloy element 0.6 at% or less, the niobium (Nb) 0 more than at% and less than or equal to 10 at%, the tungsten (W) exceeds 0 at% and less than or equal to 5 at%, the chromium (Cr) exceeds 0 at% and less than or equal to 2 at%, the silicon (Si) exceeds 0 at% and less than or equal to 1 at% , and the carbon (C) Ti-Al alloy billet manufacturing method using an internal heating type forging device, characterized in that it contains any one or more selected from more than 0 at% and 1 at% or less and the remainder other unavoidable impurities. 5. The method of claim 4,
The step (c) is,
Ti-Al alloy using an internal heating type forging device, characterized in that the Ti-Al alloy ingot is manufactured by repeatedly melting the Ti-Al alloy briquette by vacuum arc remelting by flowing an arc current to the electrode How to make a billet. delete 5. The method of claim 4,
The tertiary Ti-Al alloy ingot has a density of 3.8 g/cm ³ to 4.0 g/cm ³ . 5. The method of claim 4,
Step (d) is,
supplying the Ti-Al alloy ingot to an internal heating forging device; and
The forging die is directly heated in the forging device of the internal heating method, and forging the Ti-Al alloy ingot to produce a Ti-Al alloy billet; - Al alloy billet manufacturing method. 5. The method of claim 4,
The forging device of the internal heating method,
Comprising a forging die surrounding an alloy ingot having a circular cross section, one side of the forging die faces the alloy ingot, the other side facing the one side is formed, and the one side and the other side are connected A method for manufacturing a Ti-Al alloy billet using an internal heating forging device, characterized in that a left side and a right side of the die are formed, and a high-frequency induction heating coil is positioned between one side and the other side of the forging die.

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