A high-strength zero-expansion alloy rod and its preparation method

Abstract

The present invention belongs to the field of titanium alloys, specifically relating to a high-strength zero-expansion alloy rod and its preparation method. The alloy comprises, by mass percentage, 63% to 65% Ti, 23% to 25% Nb, 3% to 5% Zr, 7% to 9% Sn, and 0.05% to 0.2% O. The alloy exhibits a thermal expansion coefficient of less than 1.5 ppm / K along a single direction, a tensile strength of 1100 to 1500 MPa, an elongation of 8% to 15%, and an elastic modulus of 60 to 80 GPa. This invention does not involve porous material preparation, solid solution treatment, or water quenching, and does not require a phase transformation from a parent phase to a martensite phase to achieve zero expansion. This departs from conventional approaches to obtaining zero-expansion alloys in the art, achieving an alloy material that combines both high strength and zero expansion through a fundamentally different mechanism.

Description

Technical Field

[0001] The present invention belongs to the field of titanium alloys, and in particular relates to a high-strength zero-expansion alloy rod and a preparation method thereof. Background Art

[0002] In the field of precision instruments, zero expansion performance has become a key factor in materials engineering and design. Zero expansion refers to the near-zero dimensional change of a material under temperature fluctuations. This property is crucial for ensuring highly accurate and stable instrument performance under a wide range of environmental conditions.

[0003] Prior art has disclosed relevant technical solutions for obtaining negative or low expansion titanium alloys, such as those in publication numbers CN112680681A, CN115612893A, CN105886981A, CN107164653A, and CN105821246A. However, none of these prior art methods address the combined regulation of alloy strength and zero expansion properties through rotary swaging and heat treatment. Consequently, none of the titanium alloy materials disclosed in prior art possess both high strength and zero expansion properties. Summary of the Invention

[0004] The object of the present invention is to provide a high-strength zero-expansion alloy rod and a preparation method thereof, so as to solve the problem that titanium alloy plates in the prior art cannot meet the requirements of both high strength and zero-expansion properties.

[0005] The technical solution of the present invention is:

[0006] A high-strength zero-expansion alloy rod comprises the following components, measured by mass percentage: Ti 63% to 65%, Nb 23% to 25%, Zr 3% to 5%, Sn 7% to 9%, and O 0.05% to 0.2%. The alloy has a thermal expansion coefficient of less than 1.5 ppm / °C along a single direction, a tensile strength of 1100 to 1500 MPa, an elongation of 8% to 15%, and an elastic modulus of 60 to 80 GPa.

[0007] The method for preparing the high-strength zero-expansion alloy rod is carried out in the following steps:

[0008] (1) Adjusting the composition ratio so that the mass percentage of the element composition of the alloy satisfies the following: Ti: 63% to 65%, Nb: 23% to 25%, Zr: 3% to 5%, Sn: 7% to 9%, O: 0.05% to 0.2%;

[0009] (2) pressing alloy electrodes and performing vacuum melting;

[0010] (3) Forging and blanking - cooling, controlling the forging temperature to 700-1250°C, the deformation to 10-50%, the cooling rate to 10-30°C / min, and the cooling end temperature to 20°C;

[0011] (4) rolling, controlling the rolling temperature to be 400-700°C and the deformation to be 10-50%;

[0012] (5) Insulation treatment, the insulation temperature is 20-500°C, and the insulation time is 1-3 minutes;

[0013] (6) Rolling: controlling the rolling temperature to be 20-400°C and the deformation to be 10-50%;

[0014] (7) Cooling treatment at a cooling rate of 10 to 50°C / min to room temperature;

[0015] (8) Aging treatment at room temperature, aging time 5 to 24 hours;

[0016] (9) Machining to remove oxide scale;

[0017] (10) Prepare the rotary forging machine and install the forging die;

[0018] (11) The spindle starts to rotate, causing the metal blank to rotate together;

[0019] (12) While the metal blank is rotating, the forging tool or hammer impacts or squeezes it, so that the metal is gradually deformed into the desired shape; the deformation amount is 10% to 50%, and the temperature of the alloy rotary forging is controlled at 20 to 50°C; after rotary forging, the cooling rate is controlled at 5 to 25°C / min and cooled to room temperature;

[0020] (13) Heat treatment: Under vacuum aging environment, control the aging heat treatment temperature to 350°C to 450°C, the holding time to 1 to 3 hours, and the cooling rate to 10 to 30°C / min, and cool to room temperature;

[0021] (14) heat preservation treatment, the heat preservation temperature is 20 to 100 ° C, and the heat preservation time is 1 to 24 hours;

[0022] (15) Machining to remove oxide scale;

[0023] (16) High-strength zero-expansion alloy rods are obtained.

[0024] In the method for preparing the high-strength zero-expansion alloy rod, in step (10), the design of the forging die should take into account the shape and size of the final part. The forging die is usually made of a high-temperature resistant alloy to ensure wear resistance and heat resistance. The metal blank is placed on the spindle of a rotating machine tool.

[0025] In the method for preparing the high-strength zero-expansion alloy rod, in step (12), this step needs to be repeated until the size and shape required by the design are achieved.

[0026] The key points of the present invention are:

[0027] In the prior art, the conventional techniques used to solve the problem of "how to provide a zero-expansion alloy bar" include: adjusting alloy composition, rolling, solid solution treatment, water quenching, and optimizing β→α" and / or β→α' phase transformations; and the conventional techniques used to solve the problem of "how to provide a high-strength alloy material" include: adjusting deformation, adjusting precipitate content, solid solution treatment, quenching treatment, and adjusting heat treatment temperature / time. None of the above technical solutions involve the coordinated control of rolling, swaging, and heat treatment to improve both alloy strength and zero-expansion performance. Currently, there is no relevant technology that can provide an alloy material that has both "high strength" and "zero expansion".

[0028] The technical principle of the present invention is:

[0029] After limiting the alloy composition, the present invention can improve the stability of the alloy's parent phase and, at the same time, improve dislocation resistance through the synergistic effect of the various steps of the technical solution, and regulate the continuous transformation behavior of the crystal structure of the two phases so that the thermal expansion behavior of the parent phase and the precipitated phase offset each other when the alloy is heated or cooled; at the same time, with the help of room temperature aging, the alloy that meets the composition defined in this solution can produce additional strengthening phases, maintaining the zero expansion performance of the alloy while improving the strength, and ultimately making the alloy have both high strength and zero expansion performance.

[0030] The advantages and beneficial effects of the present invention are:

[0031] 1. The present invention provides a high-strength zero-expansion alloy rod. The alloy has a thermal expansion coefficient of less than 1.5 ppm / K along a single direction, a tensile strength of ≥1300 MPa, an elongation of ≥8%, and an elastic modulus of 60 to 80 GPa. This solves the shortcomings of poor mechanical properties of existing zero-expansion alloys and expands the application capabilities of zero-expansion alloys in multiple scenarios.

[0032] 2. The present invention provides a method for preparing a dual-strength zero-expansion alloy rod. This technical solution cannot include solid solution and quenching treatments, because both solid solution treatment and quenching will destroy the required texture and crystal structure of the alloy, and thus make the alloy unable to have the required thermal expansion properties. Therefore, it simplifies the existing zero-expansion alloy preparation process and effectively improves the preparation and processing efficiency of the alloy.

[0033] 3. Compared with the prior art, the present invention does not involve the preparation of porous materials, solid solution, water quenching, and other processes; it does not require the phase transformation from the parent phase to the martensite phase to achieve zero expansion, which deviates from the conventional idea of ​​obtaining zero expansion alloys in the field. Through a completely different working principle, an alloy material with both high strength and zero expansion is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the alloy's zero expansion performance.

[0035] Figure 2 Alloy high-strength performance curve. In the figure, the horizontal axis Displacement is displacement (mm) and the vertical axis Stress is strength (MPa). DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention and the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts should fall within the scope of protection of the present invention.

[0037] Example 1

[0038] In this embodiment, a method for preparing a high-strength zero-expansion alloy rod is carried out in the following steps:

[0039] (1) The composition ratio is adjusted so that the mass percentage of the element composition of the alloy satisfies the following: Ti: 64.8%, Nb: 23%, Zr: 3%, Sn: 9%, O: 0.2%.

[0040] (2) pressing alloy electrodes and performing vacuum melting;

[0041] (3) Forging and blanking - cooling, control the forging temperature to 1250℃, the deformation to 10%, the cooling rate to 10℃ / min, and the cooling end temperature to 20℃.

[0042] (4) Rolling: controlling the rolling temperature to 400°C and the deformation to 10%;

[0043] (5) Insulation treatment: insulation temperature 50°C, insulation time 1 minute;

[0044] (6) Rolling: controlling the rolling temperature to 20°C and the deformation to 10%;

[0045] (7) Cooling treatment, cooling rate 10 ° C / min, cooling to room temperature;

[0046] (8) Aging treatment at room temperature for 5 hours;

[0047] (9) Machining to remove oxide scale;

[0048] (10) Prepare the rotary forging machine and install the appropriate forging die. The forging die should be designed taking into account the shape and size of the final part. The forging die is usually made of high-temperature resistant alloy to ensure wear resistance and heat resistance. Place the metal billet on the spindle of the rotary machine;

[0049] (11) The spindle starts to rotate, causing the metal blank to rotate together;

[0050] (12) While the metal billet is rotating, the forging tool or hammer impacts or squeezes it, causing the metal to gradually deform into the desired shape. This step needs to be repeated until the design size and shape are achieved. The deformation amount is 10%, and the temperature of the alloy forging process is controlled at 20°C. After forging, cool it down at a controlled cooling rate of 5°C / min to room temperature.

[0051] (13) Heat treatment. Under vacuum aging environment, the aging heat treatment temperature is controlled to 350°C, the holding time is 1 h, the cooling rate is controlled to 10°C / min, and then cooled to room temperature;

[0052] (14) Insulation treatment, insulation temperature 20 ° C, insulation time 1 hour;

[0053] (15) Machining to remove oxide scale;

[0054] (16) A high-strength zero-expansion alloy rod was obtained, with a thermal expansion coefficient of 1.4 ppm / K along a single direction, a tensile strength of 1350 MPa, an elongation of 8%, and an elastic modulus of 65 GPa.

[0055] Example 2

[0056] In this embodiment, a method for preparing a high-strength zero-expansion alloy rod is carried out in the following steps:

[0057] (1) The composition ratio is adjusted so that the mass percentage of the element composition of the alloy satisfies the following: Ti: 62.95%, Nb: 25%, Zr: 5%, Sn: 7%, O: 0.05%.

[0058] (2) pressing alloy electrodes and performing vacuum melting;

[0059] (3) Forging and blanking - cooling, control the forging temperature to 750℃, the deformation to 15%, the cooling rate to 15℃ / min, and the cooling end temperature to 20℃.

[0060] (4) Rolling: controlling the rolling temperature to 650°C and the deformation to 45%;

[0061] (5) Insulation treatment: insulation temperature 350°C, insulation time 1.5 minutes;

[0062] (6) Rolling: controlling the rolling temperature to 380°C and the deformation to 45%;

[0063] (7) Cooling treatment, cooling rate 40 ° C / min, cooling to room temperature;

[0064] (8) Aging treatment at room temperature, aging time 24 hours;

[0065] (9) Machining to remove oxide scale;

[0066] (10) Prepare the rotary forging machine and install the appropriate forging die. The forging die should be designed taking into account the shape and size of the final part. The forging die is usually made of high-temperature resistant alloy to ensure wear resistance and heat resistance. Place the metal billet on the spindle of the rotary machine;

[0067] (11) The spindle starts to rotate, causing the metal blank to rotate together;

[0068] (12) While the metal billet is rotating, the forging tool or hammer impacts or squeezes it, causing the metal to gradually deform into the desired shape. This step needs to be repeated until the size and shape required by the design are achieved. The deformation amount is 50%, and the temperature of the alloy rotary forging is controlled at 50°C. After rotary forging, the cooling rate is controlled at 25°C / min and cooled to room temperature;

[0069] (13) Heat treatment. Under vacuum aging environment, the aging heat treatment temperature is controlled to 450°C, the holding time is 3 h, the cooling rate is controlled to 30°C / min, and then cooled to room temperature;

[0070] (14) Insulation treatment, insulation temperature 100°C, insulation time 24 hours;

[0071] (15) Machining to remove oxide scale;

[0072] (16) A high-strength zero-expansion alloy rod was obtained, with a thermal expansion coefficient of 0.9 ppm / K along a single direction, a tensile strength of 1320 MPa, an elongation of 7%, and an elastic modulus of 70 GPa.

[0073] Example 3

[0074] In this embodiment, a method for preparing a high-strength zero-expansion alloy rod is carried out in the following steps:

[0075] (1) The composition ratio is adjusted so that the mass percentage of the element composition of the alloy satisfies the following: Ti: 63.91%, Nb: 23.1%, Zr: 4.7%, Sn: 8.2%, O: 0.09%.

[0076] (2) pressing alloy electrodes and performing vacuum melting;

[0077] (3) Forging and blanking - cooling, control the forging temperature to 1050℃, the deformation to 20%, the cooling rate to 20℃ / min, and the cooling end temperature to 20℃.

[0078] (4) Rolling: controlling the rolling temperature to 500°C and the deformation to 30%;

[0079] (5) Insulation treatment, insulation temperature 250 ° C, insulation time 2 minutes;

[0080] (6) Rolling: controlling the rolling temperature to 350°C and the deformation to 30%;

[0081] (7) Cooling treatment, cooling rate 30 ° C / min, cooling to room temperature;

[0082] (8) Aging treatment at room temperature, aging time 12 hours;

[0083] (9) Machining to remove oxide scale;

[0084] (10) Prepare the rotary forging machine and install the appropriate forging die. The forging die should be designed taking into account the shape and size of the final part. The forging die is usually made of high-temperature resistant alloy to ensure wear resistance and heat resistance. Place the metal billet on the spindle of the rotary machine;

[0085] (11) The spindle starts to rotate, causing the metal blank to rotate together;

[0086] (12) While the metal billet is rotating, the forging tool or hammer impacts or squeezes it, causing the metal to gradually deform into the desired shape. This step needs to be repeated until the design size and shape are achieved. The deformation amount is 20%, and the temperature of the alloy forging process is controlled at 35°C. After forging, cool it down at a controlled cooling rate of 15°C / min to room temperature.

[0087] (13) Heat treatment. Under vacuum aging environment, the aging heat treatment temperature is controlled to 350°C, the holding time is 1 h, the cooling rate is controlled to 10°C / min, and then cooled to room temperature;

[0088] (14) Insulation treatment, insulation temperature 50°C, insulation time 10 hours;

[0089] (15) Machining to remove oxide scale;

[0090] (16) A high-strength zero-expansion alloy rod was obtained, with a thermal expansion coefficient of 1.2 ppm / K along a single direction, a tensile strength of 1300 MPa, an elongation of 8%, and an elastic modulus of 75 GPa.

[0091] Example 4

[0092] In this embodiment, a method for preparing a high-strength zero-expansion alloy rod is carried out in the following steps:

[0093] (1) The composition ratio is adjusted so that the mass percentage of the element composition of the alloy satisfies the following: Ti: 65.0%, Nb: 23.1%, Zr: 3.9%, Sn: 7.8%, O: 0.2%.

[0094] (2) pressing alloy electrodes and performing vacuum melting;

[0095] (3) Forging and blanking - cooling, control the forging temperature to 1250℃, the deformation to 10%, the cooling rate to 10℃ / min, and the cooling end temperature to 20℃.

[0096] (4) Rolling: controlling the rolling temperature to 400°C and the deformation to 10%;

[0097] (5) Insulation treatment: insulation temperature 50°C, insulation time 1 minute;

[0098] (6) Rolling: controlling the rolling temperature to 20°C and the deformation to 10%;

[0099] (7) Cooling treatment, cooling rate 10 ° C / min, cooling to room temperature;

[0100] (8) Aging treatment at room temperature for 5 hours;

[0101] (9) Machining to remove oxide scale;

[0102] (10) Prepare the rotary forging machine and install the appropriate forging die. The forging die should be designed taking into account the shape and size of the final part. The forging die is usually made of high-temperature resistant alloy to ensure wear resistance and heat resistance. Place the metal billet on the spindle of the rotary machine;

[0103] (11) The spindle starts to rotate, causing the metal blank to rotate together;

[0104] (12) While the metal billet is rotating, the forging tool or hammer impacts or squeezes it, causing the metal to gradually deform into the desired shape. This step needs to be repeated until the design size and shape are achieved. The deformation amount is 10%, and the temperature of the alloy forging process is controlled at 20°C. After forging, cool it down at a controlled cooling rate of 5°C / min to room temperature.

[0105] (13) Heat treatment. Under vacuum aging environment, the aging heat treatment temperature is controlled to 350°C, the holding time is 1 h, the cooling rate is controlled to 10°C / min, and then cooled to room temperature;

[0106] (14) Insulation treatment, insulation temperature 20 ° C, insulation time 1 hour;

[0107] (15) Machining to remove oxide scale;

[0108] (16) A high-strength zero-expansion alloy rod was obtained, with a thermal expansion coefficient of 1.4 ppm / K along a single direction, a tensile strength of 1350 MPa, an elongation of 8%, and an elastic modulus of 65 GPa.

[0109] Example 5

[0110] In this embodiment, a method for preparing a high-strength zero-expansion alloy rod is carried out in the following steps:

[0111] (1) The composition ratio is adjusted so that the mass percentage of the element composition of the alloy satisfies the following: Ti: 64.8%, Nb: 23%, Zr: 3%, Sn: 9%, O: 0.2%.

[0112] (2) pressing alloy electrodes and performing vacuum melting;

[0113] (3) Forging and blanking - cooling, control the forging temperature to 850℃, the deformation to 15%, the cooling rate to 20℃ / min, and the cooling end temperature to 20℃.

[0114] (4) Rolling: controlling the rolling temperature to 500°C and the deformation to 30%;

[0115] (5) Insulation treatment: insulation temperature 450°C, insulation time 3 minutes;

[0116] (6) Rolling: controlling the rolling temperature to 320°C and the deformation to 30%;

[0117] (7) Cooling treatment, cooling rate 30 ° C / min, cooling to room temperature;

[0118] (8) Aging treatment at room temperature, aging time 20 hours;

[0119] (9) Machining to remove oxide scale;

[0120] (10) Prepare the rotary forging machine and install the appropriate forging die. The forging die should be designed taking into account the shape and size of the final part. The forging die is usually made of high-temperature resistant alloy to ensure wear resistance and heat resistance. Place the metal billet on the spindle of the rotary machine;

[0121] (11) The spindle starts to rotate, causing the metal blank to rotate together;

[0122] (12) While the metal billet is rotating, the forging tool or hammer impacts or squeezes it, causing the metal to gradually deform into the desired shape. This step needs to be repeated until the design size and shape are achieved. The deformation amount is 10%, and the temperature of the alloy forging process is controlled at 20°C. After forging, cool it down at a controlled cooling rate of 5°C / min to room temperature.

[0123] (13) Heat treatment. Under vacuum aging environment, the aging heat treatment temperature was controlled to 380°C, the holding time was 1 h, the cooling rate was controlled to 18°C / min, and the temperature was cooled to room temperature;

[0124] (14) Insulation treatment, insulation temperature 25 ° C, insulation time 20 hours;

[0125] (15) Machining to remove oxide scale;

[0126] (16) A high-strength zero-expansion alloy rod was obtained, with a thermal expansion coefficient of 0.5 ppm / K along a single direction, a tensile strength of 1250 MPa, an elongation of 7%, and an elastic modulus of 66 GPa.

[0127] Comparative Example 1

[0128] Pure titanium, pure niobium, and pure tantalum are mixed in appropriate proportions, with the mass fraction of Nb being 25% to 29%, the mass fraction of Ta being 14% to 20%, and the remainder being Ti. Ingots are melted and cast using a vacuum consumable arc technique. The ingots undergo a high-temperature homogenization and diffusion heat treatment to eliminate element segregation. The ingots are then hot forged, annealed, and quenched, and then cold rolled to a deformation of 40% to 50%. This embodiment does not involve rotary forging, and the resulting titanium alloy does not possess the high strength and zero expansion properties.

[0129] Comparative Example 2

[0130] Five melting steps were performed using vacuum consumable electrode arc melting technology. The ingots were subjected to a high-temperature homogenization diffusion treatment at 1050°C for 24 hours to eliminate element segregation. The ingots were hot-forged into billets at 900°C. The billets were hot-rolled into thick plates at 650°C. The thick plates were solution treated and quenched at 900°C for 15 minutes using water as the quenching medium. The quenched thick plates were cold rolled at room temperature to a cold rolling deformation of 40%. The cold-rolled plates were then subjected to a short-term heat treatment at 350°C for 40 minutes. This embodiment does not involve rotary forging, and the resulting titanium alloy does not possess high strength and zero expansion properties.

[0131] Comparative Example 3

[0132] The same method as Example 1, except that the titanium alloy material obtained after hot forging was hot rolled at 1123K to form a bulk alloy; the resulting bulk alloy was encapsulated in a quartz tube for heat treatment at 1123K for 24 hours, followed by air cooling; and the cooled bulk alloy was cold rolled at room temperature in the same direction with an 8% reduction. This example does not involve rotary forging, and the resulting titanium alloy does not possess the high strength and zero expansion properties.

[0133] Comparative Example 4

[0134] The same as Example 1, except that the heat treatment process includes solid solution and water quenching. Since solid solution and water quenching will damage the high strength and zero expansion characteristics of the alloy, the strength of the obtained alloy rod is lower than 1000 MPa and the thermal expansion coefficient is higher than 5 ppm / K.

[0135] like Figure 1 As shown in the zero expansion performance diagram of the alloy, it can be seen that the obtained alloy has zero expansion performance in a wide temperature range of about 500°C, and the thermal expansion coefficient is less than 0.5ppm / °C.

[0136] like Figure 2 As shown in the figure, it can be seen from the high strength performance curve of the alloy that the tensile strength of the alloy is greater than 1300 MPa, and it has high strength characteristics.

Claims

1. A method for preparing a high-strength zero-expansion alloy rod, characterized in that: The alloy has the following composition by mass percentage: Ti 63%-65%, Nb 23%-25%, Zr 3%-5%, Sn 7%-9%, O 0.05-0.2%; the alloy has a thermal expansion coefficient of less than 1.5 ppm / °C along a single direction, a tensile strength of 1100-1500 MPa, an elongation of 8%-15%, and an elastic modulus of 60-80 GPa; The method for preparing the high-strength zero-expansion alloy rod is carried out in the following steps: (1) Adjust the composition ratio so that the mass percentage of the element composition of the alloy satisfies: Ti: 63%~65%, Nb: 23%~25%, Zr: 3%~5%, Sn: 7%~9%, O: 0.05~0.2%; (2) Pressing alloy electrodes and performing vacuum melting; (3) Forging and blanking - cooling, control the forging temperature to 700~1250℃, control the deformation to 10~50%, control the cooling rate to 10~30℃ / min, and the cooling end temperature to 20℃; (4) Rolling: control the rolling temperature to 400~700℃ and the deformation to 10~50%; (5) Insulation treatment, insulation temperature 20~500℃, insulation time 1~3 minutes; (6) Rolling: control the rolling temperature to 20~400℃ and the deformation to 10~50%; (7) Cooling treatment, cooling rate 10~50℃ / min, cooling to room temperature; (8) Aging treatment at room temperature, aging time 5 to 24 hours; (9) Machining to remove oxide scale; (10) Prepare the rotary forging machine and install the forging die; (11) The spindle starts to rotate, causing the metal billet to rotate together; (12) While the metal billet is rotating, the forging tool or hammer impacts or squeezes it, causing the metal to gradually deform into the desired shape; the deformation amount is 10%~50%, and the temperature of the alloy rotary forging is controlled at 20~50℃; after rotary forging, the cooling rate is controlled at 5~25℃ / min and cooled to room temperature; (13) Heat treatment: Under vacuum aging environment, control the aging heat treatment temperature to 350℃~450℃, the holding time to 1~3h, control the cooling rate to 10~30℃ / min, and cool to room temperature; (14) Insulation treatment, insulation temperature 20~100℃, insulation time 1~24 hours; (15) Machining to remove oxide scale; (16) High-strength zero-expansion alloy rods are obtained.

2. The method for preparing a high-strength zero-expansion alloy rod according to claim 1, characterized in that: In step (10), the forging die is designed to take into account the shape and size of the final part. The forging die is made of a high-temperature resistant alloy to ensure wear resistance and heat resistance. The metal blank is placed on the spindle of the rotating machine tool.

3. The method for preparing the high-strength zero-expansion alloy rod according to claim 1, characterized in that: In step (12), this step needs to be repeated until the design size and shape are achieved.

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