CN110814250B - Forming method of disc-shaped forging - Google Patents

Forming method of disc-shaped forging Download PDF

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CN110814250B
CN110814250B CN201911108992.9A CN201911108992A CN110814250B CN 110814250 B CN110814250 B CN 110814250B CN 201911108992 A CN201911108992 A CN 201911108992A CN 110814250 B CN110814250 B CN 110814250B
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forging
blank
forming
temperature
phase
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CN110814250A (en
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惠瑞拓
王莹
何俊
杨辉
覃佳栋
吴娟利
赵彦辉
雷丹
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AECC Aviation Power Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/02—Preliminary treatment of metal stock without particular shaping, e.g. salvaging segregated zones, forging or pressing in the rough
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002—Hybrid process, e.g. forging following casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • 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
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass

Abstract

The invention discloses a forming method of a disc-shaped forging, which comprises the following steps: forging the bar stock in the two-phase region of TβIsothermal upset cake at 30-35 deg.C above phase transition point, at TβFinish forging at 15-20 ℃ above the transformation point, and carrying out heat treatment in a two-phase region; the forming method is simple and easy to operate, has strong practicability and strong popularization; in the forming method of the invention, the bar stock is subjected to two-phase region forging change at TβIsothermal upset cake at 30-35 deg.C above phase transition point, at TβAnd (3) performing finish forging forming at 15-20 ℃ above the phase transformation point, and performing heat treatment in a two-phase region to obtain a stable structure of uniform beta-transformation high-aspect-ratio strip-shaped nascent alpha phase and a very small amount of equiaxial nascent alpha, and the stable structure has high heat strength and heat stability.

Description

Forming method of disc-shaped forging
Technical Field
The invention belongs to the field of hot working, and particularly relates to a forming method of a disc-shaped forging, which is particularly suitable for disc-shaped forgings with high requirements on fatigue strength, plasticity, heat strength and heat stability.
Background
The BT25 alloy is a heat-strength titanium alloy with excellent comprehensive performance, belongs to a martensite alpha + beta two-phase titanium alloy taking an alpha phase as a main component, and has the nominal component of Ti-6.5Al-2Mo-1Zr-1Sn-1W-0.2 Si. The alloy is mainly used for important parts such as high-pressure gas discs, casing shells, adapter casings and the like of aeroengines, and therefore, the alloy is generally required to have comprehensive mechanical properties of excellent heat strength and heat stability. Meanwhile, the BT25 titanium alloy is sensitive to forging heating parameters and process control, different tissue states can be caused by heating, forging cooling, improper operation and other influences in the forging process, and (alpha + beta) two-phase region forging and beta forging can be respectively carried out on different parts under the common condition, so that different tissues and properties can be obtained.
The BT25 alloy symmetrical disc-shaped forge piece for the aeroengine has high matching requirements on the room temperature and high temperature performance and the thermal stability performance of the forge piece, the requirement on the structure state of the forge piece is accurate, the requirement on the uniformity and the consistency of the structure performance of the forge piece is high, and the prior art is difficult to meet the requirements.
Disclosure of Invention
The invention aims to provide a forming method of a disc-shaped forging piece, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of forming a disc shaped forging comprising the steps of:
1) forging the two-phase region of the bar stock;
below TβFilling and heating the bar stock at the temperature of 40-45 ℃ of the phase transition point, and after the furnace temperature is raised to be lower than the temperatureTβPreserving heat at the phase transformation point of 40-45 ℃, and obtaining a blank after heat preservation is finished; preheating a tool and a die to a temperature not lower than 300 ℃ before forging, and carrying out two-phase region forging change of two-upsetting and two-drawing on a blank;
2) at TβIsothermal upsetting cakes at the temperature of 30-35 ℃ above the phase transformation point;
preheating the die to T before forgingβFilling the blank at a temperature of 20-30 ℃ below the transformation point, and heating the filled blank to Tβ30-35 ℃ above the phase transition point; carrying out beta isothermal upsetting cake by adopting an isothermal die forging press, and carrying out air cooling after forging to obtain a cake blank;
3) at TβFinish forging at 15-20 ℃ above the transformation point;
preheating the cake blank in an electric furnace at 300 +/-50 ℃ for 5-8 min, preheating a tool and a die to 250-350 ℃ before forging, and heating the cake blank to TβAfter the temperature is 15-20 ℃ above the transformation point, performing finish forging forming on the cake blank by using a press, and performing air cooling after forging;
4) heat treatment in two phase regions;
primary annealing: putting the cake blank after finish forging at TβKeeping the temperature below the phase transition point at 30-40 ℃ for 90min, and then dispersing and air cooling;
secondary annealing: and (4) preserving the temperature of the cake blank subjected to finish forging forming for 360min at 540 ℃, and then dispersing and air cooling.
Further, in step 1: and (3) performing two-phase region forging change of two upsetting and two drawing, and drawing the blank on a V-shaped anvil or an arc anvil.
Further, in step 1: the heat preservation time is calculated according to 0.8-1.0 min/mm.
Further, in step 1: the bar stock is cold stock before heating, the surface is polished by a round-nose lathe tool, and the end face is chamfered to R10-R15.
Further, in step 2: and (3) wrapping a soft sheath in the discharging and transferring process of the blank subjected to heat preservation in the step 1.
Further, the soft cover is composed of fiber felt and adhesive, wherein the fiber felt contains 42-44% of Al according to weight percentage2O3And 56% SiO2The adhesive is high-temperature adhesive powder special for titanium alloy.
Further, in step 2: and beta isothermal upsetting cake, wherein the pressing speed is controlled to be 1-4 mm/s by the first 90% deformation amount, and the pressing speed is controlled to be 0.1-0.5 mm/s by the last 10% deformation amount.
Further, in step 3: and (3) final forging forming, controlling the pressing speed to be 1-4 mm/s by the first 90% deformation amount, controlling the pressing speed to be 0.1-0.5 mm/s by the second 10% deformation amount, and releasing the pressure after the pressure is maintained for 100-150 s after the final deformation amount is obtained.
Further, in step 3: the cake blank before preheating in the electric furnace is sprayed with a glass protective agent.
Further, in step 3: the preheating time of the mold before production is more than or equal to 12 hours.
The invention has the following beneficial effects:
1. the forming method is simple and easy to operate, has strong practicability and strong popularization;
2. in the forming method of the invention, the bar stock is subjected to two-phase region forging change at TβIsothermal upset cake at 30-35 deg.C above phase transition point, at TβAnd (3) performing finish forging forming at 15-20 ℃ above the phase transformation point, and performing heat treatment in a two-phase region to obtain a stable structure of uniform beta-transformation high-aspect-ratio strip-shaped nascent alpha phase and a very small amount of equiaxial nascent alpha, and the stable structure has high heat strength and heat stability.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a diagram showing the heating curve of isothermal upset cake in the method for forming a disc-shaped forging piece according to the present invention;
FIG. 2 is a heating curve diagram of the finish forging forming of the forming method of a disc-shaped forging piece according to the present invention;
FIG. 3 is a flow chart of a method for forming a disc forging of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
A method of forming a disc shaped forging comprising the steps of:
1) forging the two-phase region of the bar stock;
below TβFilling and heating the bar stock at the temperature of 40-45 ℃ of the phase transition point, and after the furnace temperature is raised to be lower than TβPreserving heat at the phase transformation point of 40-45 ℃, and obtaining a blank after heat preservation is finished; preheating a tool and a die to a temperature not lower than 300 ℃ before forging, and carrying out two-phase region forging change of two-upsetting and two-drawing on a blank;
2) at TβIsothermal upsetting cakes at the temperature of 30-35 ℃ above the phase transformation point;
preheating the die to T before forgingβFilling the blank at a temperature of 20-30 ℃ below the transformation point, and heating the filled blank to Tβ30-35 ℃ above the phase transition point; carrying out beta isothermal upsetting cake by adopting an isothermal die forging press, and carrying out air cooling after forging to obtain a cake blank;
3) at TβFinish forging at 15-20 ℃ above the transformation point;
preheating the cake blank in an electric furnace at 300 +/-50 ℃ for 5-8 min, preheating a tool and a die to 250-350 ℃ before forging, and heating the cake blank to TβAfter the temperature is 15-20 ℃ above the transformation point, performing finish forging forming on the cake blank by using a press, and performing air cooling after forging;
4) heat treatment in two phase regions;
primary annealing: putting the cake blank after finish forging at TβKeeping the temperature below the phase transition point at 30-40 ℃ for 90min, and then dispersing and air cooling;
secondary annealing: and (4) preserving the temperature of the cake blank subjected to finish forging forming for 360min at 540 ℃, and then dispersing and air cooling.
Further, in step 1: and (3) performing two-phase region forging change of two upsetting and two drawing, and drawing the blank on a V-shaped anvil or an arc anvil.
Further, in step 1: the heat preservation time is calculated according to 0.8-1.0 min/mm.
Further, in step 1: the bar stock is cold stock before heating, the surface is polished by a round-nose lathe tool, and the end face is chamfered to R10-R15.
Further, in step 2: and (3) wrapping a soft sheath in the discharging and transferring process of the blank subjected to heat preservation in the step 1.
Further, the soft cover is composed of fiber felt and adhesive, wherein the fiber felt contains 42-44% of Al according to weight percentage2O3And 56% SiO2The adhesive is high-temperature adhesive powder special for titanium alloy.
Further, in step 2: and beta isothermal upsetting cake, wherein the pressing speed is controlled to be 1-4 mm/s by the first 90% deformation amount, and the pressing speed is controlled to be 0.1-0.5 mm/s by the last 10% deformation amount.
Further, in step 3: and (3) final forging forming, controlling the pressing speed to be 1-4 mm/s by the first 90% deformation amount, controlling the pressing speed to be 0.1-0.5 mm/s by the second 10% deformation amount, and releasing the pressure after the pressure is maintained for 100-150 s after the final deformation amount is obtained.
Further, in step 3: the cake blank before preheating in the electric furnace is sprayed with a glass protective agent.
Further, in step 3: the preheating time of the mold before production is more than or equal to 12 hours.
The invention aims to provide a method for forming a disc-shaped forging, wherein the forging is a disc-shaped workpiece. The high power structure of the disc-shaped forging is a stable structure of uniform beta-transition high-aspect-ratio strip-shaped primary alpha phase and a very small amount of equiaxial primary alpha.
Example 1, the specific process of this example is:
the first step is as follows: forging of two-phase region of bar stock
And after the surface of the bar stock is polished by a round-head lathe tool, chamfering the end face to R10. At TβHeating to 40 deg.C below phase transition point, charging at a certain temperature, and raising furnace temperature to TβThe heat preservation time is recorded at 40 ℃ below the phase transition point, and the cold charge heating heat preservation time is calculated according to 0.8 min/mm. Preheating a tool and a die before forging, wherein the preheating temperature is not lower than 300 ℃, performing two-phase region forging-changing of two-upsetting and two-drawing,the blank is drawn on a V-shaped anvil (arc anvil) to obtain a substantially uniform and fine two-phase region tissue.
The second step is that: at TβIsothermal upset cake with temperature of 30 ℃ above phase transition point
The blank is coated by a soft sheath, the coating material consists of fiber felt and adhesive, and the fiber felt consists of 42-44% of Al2O3 and 56% of SiO2The adhesive is high-temperature adhesive powder special for titanium alloy. Heating before heading cake is carried out according to the isothermal heading cake (raw cake) heating curve of figure 1.
Preheating the die before forging to Tβ20 ℃ below the transformation point. And discharging the blank after the blank reaches the heat preservation time, and covering and preserving heat by using a fiber felt in the blank discharging and transferring process. Heating the blank to TβAnd (3) carrying out beta isothermal upsetting cake by adopting an isothermal die forging press at the temperature of 30 ℃ above the phase transformation point, wherein the pressing speed is controlled by the first 90% of deformation amount: 2mm/s, the pressing speed is controlled by the later 10% deformation: 0.2mm/s, and air cooling after forging to obtain a cake blank.
The third step: at TβFinish forging at 15 ℃ above the transformation point
Preheating the cleaned cake blank in an electric furnace at 300 +/-50 ℃ for 8min, spraying glass protective agent before charging, preheating a mold at 300 +/-50 ℃ before production, and preheating for 12 hours. The heating curve of the finish forging in accordance with FIG. 2 is at TβHeating before forging at 15 deg.C above transformation point.
Heating the biscuit to TβAfter the temperature is 15 ℃ above the transformation point, a press is adopted for finish forging forming, and the pressing speed is controlled by the first 90% deformation: 4mm/s, the pressing speed is controlled by the later 10% deformation: 0.5mm/s, pressing until the final deformation, maintaining the pressure for 150s, and then releasing the pressure. And air cooling after forging.
The fourth step: two-phase zone heat treatment
Primary annealing: putting the cake blank after finish forging at TβKeeping the temperature below the phase transition point by 30 ℃ for 90min, and dispersing and air cooling;
secondary annealing: and (4) preserving the temperature of the cake blank subjected to finish forging forming for 360min at 540 ℃, and then dispersing and air cooling.
The forged structure state of the forged piece of the embodiment is tested, the forged piece has high-power structure original beta grain boundary fracture, no coarse, straight and continuous grain boundary alpha phase, and strip-shaped primary alpha phases with high length-width ratio are uniformly distributed on the converted beta matrix and contain a small amount of equiaxial primary alpha phases.
Example 2, the specific process of this example is:
the first step is as follows: forging of two-phase region of bar stock
And after the surface of the bar stock is polished by a round-head lathe tool, chamfering the end face to R15. At TβHeating to 45 deg.C below phase transition point, charging at warm temperature, and raising furnace temperature to TβThe temperature is 45 ℃ below the phase transition point, the heat preservation time is recorded, and the cold charge heating heat preservation time is calculated according to 1 min/mm. Preheating a tool and a die before forging, wherein the preheating temperature is not lower than 300 ℃, performing two-phase region forging change of two upsetting and two drawing, and drawing the blank on a V-shaped anvil (arc anvil) to obtain a two-phase region tissue with basically uniform and fine tissue.
The second step is that: at TβIsothermal upset cake with temperature of 35 ℃ above phase transition point
The blank is coated by a soft sheath, the coating material consists of fiber felt and adhesive, and the composition of the fiber felt is 42-44% of Al2O3And 56% SiO2The adhesive is high-temperature adhesive powder special for titanium alloy. Heating before heading cake is carried out according to the isothermal heading cake (raw cake) heating curve of figure 1.
Preheating the die before forging to TβBelow the transformation point by 30 ℃. And discharging the blank after the blank reaches the heat preservation time, and covering and preserving heat by using a fiber felt in the blank discharging and transferring process. Heating the blank to TβAnd (3) performing beta isothermal upsetting cake by adopting an isothermal die forging press at the temperature of 35 ℃ above the phase transformation point, wherein the pressing speed is controlled by the first 90% of deformation amount: 4mm/s, the pressing speed is controlled by the later 10% deformation: 0.5mm/s, and air cooling after forging to obtain a cake blank.
The third step: at TβFinish forging at 20 ℃ above the transformation point
Preheating the cleaned cake blank in an electric furnace at 300 +/-50 ℃ for 5min, spraying glass protective agent before charging, preheating a mold at 300 +/-50 ℃ before production, and preheating for 13 hours. The heating curve of the finish forging in accordance with FIG. 2 is at TβHeating before forging at 20 deg.C above transformation point.
Heating the biscuit to TβAfter the temperature is 20 ℃ above the transformation point, a press is adopted for finish forging forming, and the pressing speed is controlled by the first 90% deformation: 2mm/s, the pressing speed is controlled by the later 10% deformation: 0.2mm/s, pressing until the final deformation, maintaining the pressure for 100s, and then releasing the pressure. And air cooling after forging.
The fourth step: two-phase zone heat treatment
Primary annealing: putting the cake blank after finish forging at TβKeeping the temperature below the phase transition point by 30 ℃ for 90min, and dispersing and air cooling;
secondary annealing: and (3) preserving the temperature of the cake blank subjected to finish forging forming for 360min at 540 ℃, and then dispersing and air cooling.
The forged structure state of the forged piece of the embodiment is tested, the forged piece has high-power structure original beta grain boundary fracture, no coarse, straight and continuous grain boundary alpha phase, and strip-shaped primary alpha phase with high length-width ratio and a small amount of equiaxial blocky primary alpha phase are uniformly distributed on the converted beta matrix.
Example 3, the specific process of this example is:
the first step is as follows: forging of two-phase region of bar stock
And after the surface of the bar stock is polished by a round-head lathe tool, chamfering the end face to R12. At TβHeating to 45 deg.C below phase transition point, charging at warm temperature, and raising furnace temperature to TβThe heat preservation time is recorded at 40 ℃ below the phase transition point, and the cold charge heating heat preservation time is calculated according to 0.8 min/mm. Preheating a tool and a die before forging, wherein the preheating temperature is not lower than 300 ℃, performing two-phase region forging change of two upsetting and two drawing, and drawing the blank on a V-shaped anvil (arc anvil) to obtain a two-phase region tissue with basically uniform and fine tissue.
The second step is that: at TβIsothermal upset cake with temperature of 35 ℃ above phase transition point
The blank is coated by a soft sheath, the coating material consists of fiber felt and adhesive, and the fiber felt consists of 42-44% of Al2O3 and 56% of SiO2The adhesive is high-temperature adhesive powder special for titanium alloy. Heating before heading cake is carried out according to the isothermal heading cake (raw cake) heating curve of figure 1.
Preheating the die before forging to TβBelow the transformation point by 25 ℃. Blank holderAnd discharging the blank after the heat preservation time, and covering and preserving heat by using a fiber felt in the blank discharging and transferring process. Heating the blank to TβAnd (3) performing beta isothermal upsetting cake by adopting an isothermal die forging press at the temperature of 35 ℃ above the phase transformation point, wherein the pressing speed is controlled by the first 90% of deformation amount: 3mm/s, the pressing speed is controlled by the later 10% deformation: 0.3mm/s, and air cooling after forging to obtain a cake blank.
The third step: at TβFinish forging at 20 ℃ above the transformation point
Preheating the cleaned cake blank in an electric furnace at 300 +/-50 ℃ for 8min, spraying glass protective agent before charging, preheating a mold at 300 +/-50 ℃ before production, and preheating for 12 hours. The heating curve of the finish forging in accordance with FIG. 2 is at TβHeating before forging at 20 deg.C above transformation point.
Heating the biscuit to TβAfter the temperature is 20 ℃ above the transformation point, a press is adopted for finish forging forming, and the pressing speed is controlled by the first 90% deformation: 3mm/s, the pressing speed is controlled by the later 10% deformation: 0.3mm/s, pressing until the final deformation, maintaining the pressure for 150s, and then releasing the pressure. And air cooling after forging.
The fourth step: two-phase zone heat treatment
Primary annealing: putting the cake blank after finish forging at TβKeeping the temperature below the phase transition point for 90min at 40 ℃, and dispersing and air cooling;
secondary annealing: and (3) preserving the temperature of the cake blank subjected to finish forging forming for 360min at 540 ℃, and then dispersing and air cooling.
The forged structure state of the forged piece of the embodiment is tested, the forged piece has high-power structure original beta grain boundary fracture, no coarse, straight and continuous grain boundary alpha phase, and strip-shaped primary alpha phase with high length-width ratio and a small amount of equiaxial blocky primary alpha phase are uniformly distributed on the converted beta matrix.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.

Claims (10)

1. A method for forming a disc-shaped forging, which is suitable for the BT25 alloy, comprises the following steps:
1) forging the two-phase region of the bar stock;
at furnace temperature lower than TβFilling and heating the bar stock at the temperature of 40-45 ℃ of the phase transition point, and after the furnace temperature is raised to be lower than TβPreserving heat at the phase transformation point of 40-45 ℃, and obtaining a blank after heat preservation is finished; preheating a tool and a die to a temperature not lower than 300 ℃ before forging, and carrying out two-phase region forging change of two-upsetting and two-drawing on a blank;
2) at TβIsothermal upsetting cakes at the temperature of 30-35 ℃ above the phase transformation point;
preheating the die to T before forgingβFilling the blank at a temperature of 20-30 ℃ below the transformation point, and heating the filled blank to Tβ30-35 ℃ above the phase transition point; carrying out beta isothermal upsetting cake by adopting an isothermal die forging press, and carrying out air cooling after forging to obtain a cake blank;
3) at TβFinish forging at 15-20 ℃ above the transformation point;
preheating the cake blank in an electric furnace at 300 +/-50 ℃ for 5-8 min, preheating a tool and a die to 250-350 ℃ before forging, and heating the cake blank to TβAfter the temperature is 15-20 ℃ above the transformation point, performing finish forging forming on the cake blank by using a press, and performing air cooling after forging;
4) heat treatment in two phase regions;
primary annealing: putting the cake blank after finish forging at TβKeeping the temperature below the phase transition point at 30-40 ℃ for 90min, and then dispersing and air cooling;
secondary annealing: and (4) preserving the temperature of the cake blank subjected to finish forging forming for 360min at 540 ℃, and then dispersing and air cooling.
2. The method of forming a disc forging of claim 1, wherein in step 1): and (3) performing two-phase region forging change of two upsetting and two drawing, and drawing the blank on a V-shaped anvil or an arc anvil.
3. The method of forming a disc forging of claim 1, wherein in step 1): the heat preservation time is calculated according to 0.8-1.0 min/mm.
4. The method of forming a disc forging of claim 1, wherein in step 1): the bar stock is cold stock before heating, the surface is polished by a round-nose lathe tool, and the end face is chamfered to R10-R15.
5. The method of forming a disc forging of claim 1, wherein in step 2): and (3) wrapping a soft sheath in the discharging and transferring process of the blank subjected to heat preservation in the step 1.
6. The method of claim 5, wherein the soft cover is made of fiber felt and adhesive, and the fiber felt contains 42-44% by weight of Al2O3And 56% SiO2The adhesive is high-temperature adhesive powder special for titanium alloy.
7. The method of forming a disc forging of claim 1, wherein in step 2): and beta isothermal upsetting cake, wherein the pressing speed is controlled to be 1-4 mm/s by the first 90% deformation amount, and the pressing speed is controlled to be 0.1-0.5 mm/s by the last 10% deformation amount.
8. The method of forming a disc forging of claim 1, wherein in step 3): and (3) final forging forming, controlling the pressing speed to be 1-4 mm/s by the first 90% deformation amount, controlling the pressing speed to be 0.1-0.5 mm/s by the second 10% deformation amount, and releasing the pressure after the pressure is maintained for 100-150 s after the final deformation amount is obtained.
9. The method of forming a disc forging of claim 1, wherein in step 3): the cake blank before preheating in the electric furnace is sprayed with a glass protective agent.
10. The method of forming a disc forging of claim 1, wherein in step 3): the preheating time of the mold before production is more than or equal to 12 hours.
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