CN115106471A - Forging method of titanium alloy forging with rectangular cross section - Google Patents
Forging method of titanium alloy forging with rectangular cross section Download PDFInfo
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- CN115106471A CN115106471A CN202210898944.XA CN202210898944A CN115106471A CN 115106471 A CN115106471 A CN 115106471A CN 202210898944 A CN202210898944 A CN 202210898944A CN 115106471 A CN115106471 A CN 115106471A
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- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
The invention relates to a forging method of a titanium alloy forging with a rectangular section, which comprises the following steps: s1, cogging and forging: cogging and forging the titanium alloy, and upsetting and drawing the blank to a set size for multiple times; s2, intermediate forging: carrying out multiple fire times of forging change on the blanked blank to obtain an intermediate forged blank; s3, forging of finished products: and (3) performing multi-fire molding on the intermediate forging blank at the temperature lower than the phase change point to finally obtain the rectangular-section titanium alloy forging meeting the specification. The method ensures that the deformation of the blank at each angle is consistent, reduces the difference between the edges and the middle part tissue when the blank is finally formed into a square blank, and ensures the uniformity of the forging part tissue to the greatest extent.
Description
Technical Field
The invention belongs to the technical field of titanium alloy forging, and relates to a forging method of a titanium alloy forging with a rectangular cross section.
Background
The titanium alloy has the advantages of high specific strength, strong corrosion resistance, good biocompatibility, capability of working for a long time at high temperature and the like, is widely applied to the fields of national defense and military industry, aerospace and aviation, ships, chemical engineering, medical use, biology and the like, and is called as future metal. Titanium alloys have been used in some advanced aircraft in titanium alloy weight ratios in excess of 30%, and this ratio has increased year by year as manufacturing and fabrication technology has advanced. Titanium alloys also have some disadvantages: such as large deformation resistance, large notch sensitivity, poor thermal conductivity, large influence of tissue change on mechanical properties, etc. Leading to a high degree of uncertainty in the hot working process.
The forging with the rectangular section is a special form in the forging, and the forging process of the forging is greatly different from that of the forging with the circular section. In the forming process, the edge part is compared with other parts and is easily cooled, the metal fluidity becomes poor after cooling, crystal grains are not easy to break, the edge part structure of the edge is poor, the integral structure of a forge piece is uneven, and the use working condition of the condition is severe. In addition to the mechanical properties of the titanium alloy forging, nondestructive testing methods such as ultrasonic flaw detection and the like are also important evaluation methods for the titanium alloy forging. Particularly, in the aspect of evaluating the uniformity of the forged piece, ultrasonic flaw detection has irreplaceable convenience and operability. The requirement of the structural uniformity of the forged piece is that the bottom wave loss does not exceed 50% specified in GJB 2744A.
When the forging with the rectangular cross section is formed, a plurality of forming modes can be designed according to different blank specifications for the convenience of the production process. However, in view of previous data, not all forming methods can produce forgings meeting standards, especially forgings with special requirements on uniformity. Therefore, a special forming mode is needed for the forging piece.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a forging method of a titanium alloy forging with a rectangular cross section, which ensures that the deformation of a blank at each angle is consistent, reduces the difference between the edges and the tissues of the middle part when the blank is finally formed into a square blank, and ensures the uniformity of the tissues of the forging to the greatest extent.
In order to achieve the purpose, the invention adopts the following technical scheme:
a forging method of a titanium alloy forging with a rectangular section is characterized by comprising the following steps:
s1, cogging and forging: cogging and forging the titanium alloy, and upsetting and drawing the blank to a set size for multiple times;
s2, intermediate forging: carrying out multiple fire times of forging change on the blanked blank to obtain an intermediate forged blank;
s3, forging of finished products: and (3) performing multi-fire molding on the intermediate forging blank at the temperature lower than the phase change point to finally obtain the rectangular-section titanium alloy forging meeting the specification.
Further, the cogging and forging of S1 are carried out for 1-3 times, the heating temperature of the cogging and forging is 1000-1200 ℃, the heat preservation coefficient is 0.5-1.2, the forging ratio is 1.5-2.5, and an anvil with the width of 400-1000 mm is used for upsetting the blank.
Further, the cogging forging is divided into two upsetting operations, and chamfering is performed on the blank after each elongation.
Further, the S2 specifically includes:
s21, performing 2-4 times of forging change on the blank subjected to cogging forging in the step S1 above a phase change point, heating the blank to 10-20 ℃ above the phase change point, changing the forging mode into upsetting, performing 2 times of upsetting and 2 times of drawing length on each time of forging, chamfering the blank after each time of drawing length, wherein the upsetting ratio of each time of forging is 1.5-2.0, and cooling the blank in a water cooling mode after forging to obtain a primary intermediate forged blank;
s22, performing 2-4 times of heating forging on the primary intermediate forging blank below a phase change point, performing heating at the temperature of 30-60 ℃ below the phase change point, performing upsetting in the forging mode, performing upsetting for 2 times and performing lengthening for 2 times per heating time, chamfering the blank after each lengthening, performing axial and radial reversing on the blank after 1 time of upsetting is completed, wherein the upsetting ratio of each heating time is 1.7-2.2, cooling by adopting a water cooling mode after forging, and performing air cooling in the cooling mode of the last heating time to obtain a secondary intermediate forging blank;
and S23, distributing the secondary intermediate forging blank, wherein the distributed blank has a weight of 200-400 Kg, performing upsetting on the distributed blank at a temperature of 40-70 ℃ below a phase change point for 2-4 times, performing upsetting and 2-time drawing for each time, chamfering the blank after each drawing, reversing the blank at the same time, and performing upsetting-drawing ratio of 1.7-2.5 at each time, cooling to obtain a tertiary intermediate forging blank, and cooling by water.
Further, the S3 specifically includes: and (3) performing 2-4 times of fire forming and forging on the three intermediate forged blanks obtained in the step S2 below the phase transformation point, heating at 50-70 ℃ below the phase transformation point, performing length drawing in a mode of drawing length with a drawing length ratio of 2-5, rolling a burr circle on the blanks after drawing length of the square rod of each fire is finished, and continuing drawing length in the next fire time until the rectangular-section titanium alloy forged piece meeting the specification is obtained.
Furthermore, the square billet is provided with a single-time ruler in the height direction and a width direction and a multiple-time ruler in the length direction,
furthermore, in the multiple fire molding stage in S3, the cooling mode is air cooling.
Compared with the prior art, the invention has the following beneficial effects:
in the forging method, the ingot casting is subjected to repeated hot forging changing, the secondary intermediate forging blank is divided, then the small-specification blank is subjected to repeated hot forging changing, reversing forging changing treatment is added, and after a series of repeated hot forging changing, the tissues of all parts of the blank are uniform; in the forming stage, the blank is rolled into a round shape after drawing out is finished, so that the deformation of the blank at each angle is consistent, the difference between the edges and the middle part tissue is reduced when the blank is finally formed into a square blank, and the uniformity of the forging part tissue is ensured to the maximum extent.
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 microstructure of a forging of example 1 of the present invention;
FIG. 2 is a microstructure of a forging of example 2 of the present invention;
FIG. 3 is a schematic view of the 1-pass cogging forging process of the present invention;
FIG. 4 is a schematic view of the 1-pass intermediate forging process of the present invention;
FIG. 5 is a schematic view of the forging process of the finished product of the present invention.
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 solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and examples.
A forging method of a titanium alloy forging with a rectangular cross section comprises the following steps:
s1, cogging and forging: cogging and forging the titanium alloy, and upsetting and drawing the blank to a set size for multiple times; the cogging forging is carried out for 1-3 times, the heating temperature of the cogging forging is 1000-1200 ℃, the heat preservation coefficient is 0.5-1.2, the forging ratio is 1.5-2.5, an anvil with the width of 400-1000 mm is used for upsetting the blank, the cogging forging is divided into two upsetting-drawing steps, and the blank is chamfered after each upsetting-drawing step.
S2, intermediate forging:
s21, performing 2-4 times of forging change on the blank subjected to cogging forging in the step S1 above a phase change point, heating the blank to 10-20 ℃ above the phase change point, changing the forging mode into upsetting, performing 2 times of upsetting and 2 times of drawing length on each time of forging, chamfering the blank after each time of drawing length, wherein the upsetting ratio of each time of forging is 1.5-2.0, and cooling the blank in a water cooling mode after forging to obtain a primary intermediate forged blank;
s22, performing 2-4 times of hot forging on the primary intermediate forged blank below a phase change point, performing heating at the temperature of 30-60 ℃ below the phase change point, performing upsetting in the same manner, performing upsetting and 2 times of elongation every hot forging, chamfering the blank after each elongation, performing axial and radial reversing on the blank after 1 time of upsetting is completed, wherein the upsetting-elongation ratio of each hot forging is 1.7-2.2, cooling by adopting a water cooling manner after forging, and performing air cooling in the cooling manner of the last hot forging to obtain a secondary intermediate forged blank;
and S23, distributing the secondary intermediate forging blank, wherein the distributed blank has a weight of 200-400 Kg, performing upsetting on the distributed blank at a temperature of 40-70 ℃ below a phase change point for 2-4 times, performing upsetting and 2-time drawing for each time, chamfering the blank after each drawing, reversing the blank at the same time, and performing upsetting-drawing ratio of 1.7-2.5 at each time, cooling to obtain a tertiary intermediate forging blank, and cooling by water.
S3, forging of finished products: and (3) performing multi-fire molding on the intermediate forging blank at the temperature lower than the phase change point to finally obtain the rectangular-section titanium alloy forging meeting the specification. And (3) performing 2-4 fire forming forging changing on the three-time intermediate forged blank obtained in the step S2 below a phase transition point, heating at the temperature of 50-70 ℃ below the phase transition point, changing the forging mode into drawing length, wherein the drawing length ratio is 2-5, performing round rolling on the blank after drawing length of a square rod of each fire time is finished, and continuing drawing length in the next fire time until a rectangular section titanium alloy forged piece meeting the specification is obtained, wherein the square blank is single-multiple-length in the height and width directions and multiple-length in the length direction, and the cooling mode in the multi-fire forming stage is air cooling.
The following is described with reference to specific process procedures:
example 1
The standard is GJB2744A-2019, the flaw detection is a TC4 forging preparation method with the grade of A and the specification of 60 multiplied by 80 multiplied by 190:
s1, cogging and forging:
blank size: phi 600 multiplied by 850mm, cogging forging heating temperature of 1000-1200 ℃, heat preservation coefficient of 0.5-1.2, forging ratio of 1.5-2.5, and using anvil with width of 400-1000 mm when upsetting the blank. The blank is subjected to two upsetting and two drawing, and the octagonal dimension is 495 multiplied by 990 mm. The cooling method is water cooling.
S2, intermediate forging:
blank size: heating to 10-20 ℃ above the phase transition point, changing forging fire times to 2-4 fire times, changing forging mode to two upsetting and two drawing, chamfering the blank after drawing each time, ensuring that the blank keeps a uniform state of the whole color in the forging process, wherein the upsetting-drawing ratio of each fire time is 1.5-2.0, cooling after forging, and cooling by water cooling to obtain a primary intermediate forged blank with the specification of 495 x 990 mm;
performing secondary forging change on the primary intermediate forged blank at the temperature of between 30 and 60 ℃ below the phase transition point for 2 to 4 times, performing secondary upsetting and secondary drawing in the forging change mode, and chamfering the blank after each drawing to ensure that the blank keeps a uniform integral color state in the forging process; after 1 upsetting and drawing, the blank needs to be axially and radially reversed, the upsetting and drawing ratio of each heating is 1.7-2.2, cooling is carried out after forging, the cooling mode is water cooling, and the cooling mode of the last heating is air cooling, so that a secondary intermediate forged blank is obtained, wherein the specification of the secondary intermediate forged blank is 495 x 990mm in eight directions;
dividing the secondary intermediate forging blank into eight parts with the specification of 495 multiplied by 440mm after material distribution, performing secondary forging change on the blank below a phase change point by 2-4 times of fire, heating the blank at the temperature of 30-60 ℃ below the phase change point, performing double upsetting and double drawing in the forging change mode, chamfering the blank after drawing out each time, and ensuring that the blank keeps a state of uniform integral color in the forging process; and after 1 upsetting and drawing, the blank needs to be axially and radially reversed, and the upsetting and drawing ratio of each heating is 1.7-2.2. Cooling after forging in a water cooling mode to obtain a three-time intermediate forging blank with the specification of 495 multiplied by 990 in an eight direction;
s3, forging of finished products:
and (3) performing 2-4 times of hot forming and forging on the three-time intermediate forged blank obtained in the step S2 below the phase transition point, heating at the temperature of 50-70 ℃ below the phase transition point, wherein the forging mode is drawing and forging, the drawing ratio is 2-5, after the drawing of the square rod of each hot time is finished, the blank needs to be subjected to round rolling, and the blank continues to be drawn in the next hot time until a square blank meeting the requirements is obtained, wherein the blank is single-multiple ruler in the height and width direction, the length direction is multiple ruler, and the cooling mode is air cooling in the step S3. And (5) machining the blank after the finished product is forged to finish the preparation of the forge piece.
The physical and chemical detection result of the forging piece is as follows:
(1) the mechanical property of the forgings at room temperature is as follows:
the mechanical properties of the forgings after heat treatment are shown in the table below, the room-temperature mechanical properties of the forgings in the L/LT/ST direction all meet and are higher than the requirements in GB/T2744A-2019, the differences in the three directions are small, and the uniformity of the structures of the forgings in all directions can be seen from the mechanical properties. The L-direction impact and the T-L direction KIC also meet the standard requirements, and the hardness of each direction reaches the standard.
(2) Forging macrostructure:
the macroscopic is free of cracks, folds, porosity, segregation, metallic or non-metallic inclusions and other visually observable metallurgical defects.
(3) Microstructure of the forged piece:
as shown in fig. 1, in the homogeneous structure processed in the two-phase region, β -grain boundaries α were sufficiently broken, and continuous and flat grain boundary α phases were not observed.
(4) Forging ultrasonic flaw detection:
example 2
The preparation method of the TB6 forge piece with the standard of GJB2744A-2019, the flaw detection grade of A grade and the specification of 200 × 100 × 100:
s1, cogging and forging:
blank size: phi is 500 mm multiplied by 750mm, the heating temperature of cogging forging is 1000 to 1200 ℃, the heat preservation coefficient is 0.5 to 1.2, the forging ratio is 1.5 to 2.5, and an anvil with the width of 400 to 1000mm is used for upsetting the blank. The blank is subjected to two-heading and two-drawing to obtain the octagon 420X 835 mm. The cooling method is water cooling.
S2, intermediate forging:
blank size: the method is characterized in that the thickness of the billet is 420-835 mm in eight directions, the heating temperature is 10-20 ℃ above the phase change point, the forging heating time is 2-4 heating times, the forging mode is two upsetting and two drawing, the billet is chamfered after each drawing, the condition that the overall color of the billet is uniform in the forging process is guaranteed, and the upsetting-drawing ratio of each heating time is 1.5-2.0. Cooling after forging in a water cooling mode to obtain a primary intermediate forging blank with the specification of eight directions of 420 multiplied by 835 mm;
performing secondary forging change on the primary intermediate forged blank at the temperature of between 30 and 60 ℃ below the phase transition point for 2 to 4 times, performing secondary upsetting and secondary drawing in the forging change mode, and chamfering the blank after each drawing to ensure that the blank keeps a uniform integral color state in the forging process; and after 1 upsetting and drawing, the blank needs to be subjected to axial and radial reversing, and the upsetting and drawing ratio of each fire is 1.7-2.2. Cooling after forging, wherein the cooling mode is water cooling, and the cooling mode at the last heating time is air cooling to obtain a secondary intermediate forging blank with the specification of 420 x 835mm in eight directions;
dividing the secondary intermediate forging blank into eight-square pieces with the specification of 420 x 415mm after material division, performing secondary forging change on the blank below a phase change point by 2-4 times of fire, heating the blank to the temperature of 30-60 ℃ below the phase change point, performing double upsetting and double drawing in the forging change mode, chamfering the blank after drawing out each time, and ensuring that the blank keeps a state of uniform integral color in the forging process; and after 1 upsetting and drawing, the blank needs to be subjected to axial and radial reversing, and the upsetting and drawing ratio of each fire is 1.7-2.2. Cooling after forging in a water cooling mode to obtain a three-time intermediate forging blank with the specification of eight directions of 420 multiplied by 415 mm;
s3, forging of finished products:
and (3) performing 2-4 times of hot forming and forging on the three-time intermediate forged blank obtained in the step S2 below the phase transition point, heating at the temperature of 50-70 ℃ below the phase transition point, wherein the forging mode is drawing and forging, the drawing ratio is 2-5, after the drawing of the square rod of each hot time is finished, the blank needs to be subjected to round rolling, and the blank continues to be drawn in the next hot time until a square blank meeting the requirements is obtained, wherein the blank is single-multiple ruler in the height and width direction, the length direction is multiple ruler, and the cooling mode is air cooling in the step S3. And (5) machining the blank after the finished product is forged to finish the preparation of the forge piece.
The physical and chemical detection result of the forging piece is as follows:
(1) the mechanical property of the forgings at room temperature is as follows:
the mechanical properties of the forged piece after heat treatment are shown in the table below, the room-temperature mechanical properties of the forged piece in the L/LT/ST direction are all in accordance with and higher than the requirements in GB/T2744A-2019, the difference in the three directions is small, and the uniformity of the structure of the forged piece in each direction can be seen from the mechanical properties. The T-L direction KIC also meets the standard requirements.
(2) Forging macrostructure:
the low power has no crack, inclusion, segregation, shrinkage cavity, air hole, layering and other metallurgical defects. Low power with no visible clear grains.
(3) The microstructure of the forged piece is as follows:
as shown in fig. 2, the aging beta matrix, spherical and strip alpha phase composition, the primary alpha phase content is more than 10%, the original beta grain boundary has no continuous and straight alpha phase network, no coarse grain boundary alpha phase structure and no beta spot.
(4) Forging ultrasonic flaw detection:
the foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present 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 forging method of a titanium alloy forging with a rectangular cross section is characterized by comprising the following steps:
s1, cogging and forging: cogging and forging the titanium alloy, and upsetting and drawing the blank to a set size for multiple times;
s2, intermediate forging: carrying out multiple fire times of forging change on the blanked blank to obtain an intermediate forged blank;
s3, forging of finished products: and (3) performing multi-fire forming on the intermediate forging blank at the temperature lower than the phase change point to finally obtain the rectangular-section titanium alloy forging meeting the specification.
2. The forging method of the rectangular-section titanium alloy forging piece according to claim 1, wherein the cogging forging of S1 is performed 1-3 times, the heating temperature of the cogging forging is 1000-1200 ℃, the holding coefficient is 0.5-1.2, the forging ratio is 1.5-2.5, and an anvil with a width of 400-1000 mm is used for upsetting the blank.
3. The forging method of the rectangular section titanium alloy forging piece, according to claim 1, wherein the cogging forging is divided into two upsetting operations, and the blank is chamfered after each elongation.
4. The forging method of the titanium alloy forging with the rectangular cross section as claimed in claim 1, wherein the S2 specifically comprises:
s21, performing 2-4 times of forging change on the blank subjected to cogging forging in the step S1 above a phase change point, heating the blank to 10-20 ℃ above the phase change point, changing the forging mode into upsetting, performing 2 times of upsetting and 2 times of drawing length on each time of forging, chamfering the blank after each time of drawing length, wherein the upsetting ratio of each time of forging is 1.5-2.0, and cooling the blank in a water cooling mode after forging to obtain a primary intermediate forged blank;
s22, performing 2-4 times of hot forging on the primary intermediate forged blank below a phase change point, performing heating at the temperature of 30-60 ℃ below the phase change point, performing upsetting in the same manner, performing upsetting and 2 times of elongation every hot forging, chamfering the blank after each elongation, performing axial and radial reversing on the blank after 1 time of upsetting is completed, wherein the upsetting-elongation ratio of each hot forging is 1.7-2.2, cooling by adopting a water cooling manner after forging, and performing air cooling in the cooling manner of the last hot forging to obtain a secondary intermediate forged blank;
and S23, distributing the secondary intermediate forging blank, wherein the distributed blank has a weight of 200-400 Kg, performing upsetting on the distributed blank at a temperature of 40-70 ℃ below a phase change point for 2-4 times, performing upsetting and 2-time drawing for each time, chamfering the blank after each drawing, reversing the blank at the same time, and performing upsetting-drawing ratio of 1.7-2.5 at each time, cooling to obtain a tertiary intermediate forging blank, and cooling by water.
5. The forging method of the titanium alloy forging with the rectangular cross section as claimed in claim 1, wherein the S3 is specifically: and (3) performing 2-4 times of hot forming and forging change on the three-time intermediate forged blank obtained in the step (S2) below the phase transition point, heating at the temperature of 50-70 ℃ below the phase transition point, performing drawing in a drawing mode, wherein the drawing ratio is 2-5, performing round rolling on the blank after drawing of a square rod at each time is finished, and continuing drawing in the next hot time until a rectangular-section titanium alloy forging meeting the specification is obtained.
6. The forging method of the titanium alloy forging with the rectangular cross section as claimed in claim 5, wherein the square billet is single-multiple-length in the height direction and the width direction and multiple-length in the length direction.
7. The forging method of the titanium alloy forging with the rectangular cross section as claimed in claim 5, wherein in the S3 multi-fire forming stage, the cooling mode is air cooling.
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| CN117324522A (en) * | 2023-09-28 | 2024-01-02 | 陕西鼎益科技有限公司 | Forging forming method for improving flaw detection level of titanium alloy bar |
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| CN117324522A (en) * | 2023-09-28 | 2024-01-02 | 陕西鼎益科技有限公司 | Forging forming method for improving flaw detection level of titanium alloy bar |
| CN117324522B (en) * | 2023-09-28 | 2024-04-12 | 陕西鼎益科技有限公司 | Forging forming method for improving flaw detection level of titanium alloy bar |
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