CN114472766A - Ti-6242 alloy ring forging beta forging method and device - Google Patents
Ti-6242 alloy ring forging beta forging method and device Download PDFInfo
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- CN114472766A CN114472766A CN202111534040.0A CN202111534040A CN114472766A CN 114472766 A CN114472766 A CN 114472766A CN 202111534040 A CN202111534040 A CN 202111534040A CN 114472766 A CN114472766 A CN 114472766A
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- 238000005242 forging Methods 0.000 title claims abstract description 67
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 51
- 239000000956 alloy Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 60
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 230000009466 transformation Effects 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 12
- 230000008859 change Effects 0.000 claims abstract description 10
- 238000012546 transfer Methods 0.000 claims abstract description 7
- 229920000742 Cotton Polymers 0.000 claims description 6
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 229910001069 Ti alloy Inorganic materials 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000002902 bimodal effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910004349 Ti-Al Inorganic materials 0.000 description 1
- 229910004692 Ti—Al Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention belongs to the technical field of titanium alloy hot working, and relates to a method and a device for beta forging of a Ti-6242 alloy ring forging. The method comprises the following steps: step one, forging a Ti-6242 alloy bar stock in a conventional alpha + beta region to obtain a prefabricated Ti-6242 alloy ring blank; step two, heating and sheathing the Ti-6242 alloy ring blank at the phase change point within the temperature range of 25-35 ℃; step three, rolling the heated and sheathed Ti-6242 alloy ring blank at a phase transformation point, wherein the control point comprises the following steps: a) the discharging transfer time is controlled within 40 s; b) the speed increasing of the rolling ring is controlled to be 8-10 mm/s, the total reserved deformation is controlled to be 70-80%, and the rolling time is controlled to be 15-20 s; step four, rolling the rolled Ti-6242 alloy ring blank under a phase transformation point, wherein the control points comprise: a) stopping for 5-10 s after rolling is finished; b) and (4) after stopping, performing accelerated rolling by a ring of 4-6 mm/s until the final size of the ring piece is reached, finishing the residual deformation of 20-30%, and controlling the rolling time within 10-15 s, so as to ensure that the time of the whole discharging forging process is controlled within 90 s.
Description
Technical Field
The invention belongs to the technical field of titanium alloy hot working, and relates to a beta forging method and a beta forging device for a Ti-6242 alloy ring forging.
Background
The Ti-6242 alloy is a near-alpha type titanium alloy, which is prepared by adding Sn and Zr on the basis of Ti-Al based alpha solid solution, obviously improving the high-temperature creep resistance of the alloy through solid solution strengthening, and enabling the alloy to obtain good high-temperature strength under the comprehensive action of Al, Sn and Zr until the temperature reaches 540 ℃ and also has higher strength. The method is mainly used for manufacturing the compressor casing, the drum barrel and the disc of the aircraft engine.
In recent years, researches show that the bimodal structure Ti-6242 alloy forging piece has load-holding fatigue sensitivity under the working condition of an air compressor, the application of the alloy on the aeroengine forging piece is greatly limited, and the development of a Ti-6242 alloy beta forging process capable of obtaining a basket structure is urgently needed in order to reduce the load-holding fatigue sensitivity. The alpha plus beta forging technology of the Ti-6242 alloy is widely applied in the field of aviation, the process maturity is high, the beta forging process, particularly the beta forging of the ring forging is still blank at home, the wall thickness of the ring forging is small, the beta forging heating temperature is high, the temperature drop is fast, the forging window is narrower, and the tissue control difficulty is larger.
Disclosure of Invention
The purpose of the invention is: realizes the structure control technology of the Ti-6242 alloy drum cylinder ring forging beta forging net basket, and avoids the appearance of a bimodal structure and a Widmannstatten structure.
In order to solve the technical problem, the technical scheme of the invention is as follows: .
A beta forging method for a Ti-6242 alloy ring forging comprises the following steps:
step one, forging a Ti-6242 alloy bar stock in a conventional alpha + beta region to obtain a prefabricated Ti-6242 alloy ring blank; the Ti-6242 alloy ring blank is prepared by reserving 40-50% of deformation for final hot beta ring rolling forging;
step two, heating and sheathing the Ti-6242 alloy ring blank at the phase change point within the temperature range of 25-35 ℃;
step three, rolling the heated and sheathed Ti-6242 alloy ring blank at a phase transformation point, wherein the control point comprises the following steps: a) the discharging transfer time is controlled within 40 s; b) the speed increasing of the rolling ring is controlled to be 8-10 mm/s, the total reserved deformation is controlled to be 70-80%, and the rolling time is controlled to be 15-20 s;
step four, rolling the rolled Ti-6242 alloy ring blank under the phase transformation point, wherein the control point comprises the following steps: a) stopping for 5-10 s after the rolling is finished in the third step; b) and (4) after stopping, performing accelerated rolling by a ring of 4-6 mm/s until the final size of the ring piece is reached, finishing the residual deformation of 20-30%, and controlling the rolling time within 10-15 s, so as to ensure that the time of the whole discharging forging process is controlled within 90 s.
Further, the heating coefficient of the second step is 0.7 min/mm-0.9 min/mm;
and further, soft sheathing is carried out on aluminum silicate heat-preservation cotton with the thickness of 10mm, and after sheathing is finished, the aluminum silicate heat-preservation cotton is returned to the furnace and heat is preserved for 45-60 min according to the original temperature.
Furthermore, the heating temperature of the conventional alpha + beta region forging is 30-50 ℃ below the transformation point.
A Ti-6242 alloy ring forging beta forging device comprises:
the conventional forging unit is used for forging the Ti-6242 alloy bar stock in a conventional alpha + beta region to obtain a prefabricated Ti-6242 alloy ring blank; the Ti-6242 alloy ring blank is prepared by reserving 40-50% of deformation for final hot beta ring rolling forging;
the heating and sheathing unit is used for heating and sheathing the Ti-6242 alloy ring blank at the phase change point within the temperature range of 25-35 ℃;
the first rolling unit is used for rolling the heated and sheathed Ti-6242 alloy ring blank at the phase transformation point, and the control points of the first rolling unit comprise: a) the discharging transfer time is controlled within 40 s; b) the speed increasing of the rolling ring is controlled to be 8-10 mm/s, the total reserved deformation is controlled to be 70-80%, and the rolling time is controlled to be 15-20 s;
the second rolling unit is used for rolling the rolled Ti-6242 alloy ring blank under the phase transformation point, and the control points comprise: a) stopping for 5-10 s after the rolling is finished in the third step; b) and (4) after stopping, performing accelerated rolling by a ring of 4-6 mm/s until the final size of the ring piece is reached, finishing the residual deformation of 20-30%, and controlling the rolling time within 10-15 s, so as to ensure that the time of the whole discharging forging process is controlled within 90 s.
Further, the heating coefficient of the heating and sheathing unit is 0.7 min/mm-0.9 min/mm;
further, the heating and sheathing unit is used for carrying out soft sheathing by adopting aluminum silicate heat-preservation cotton with the thickness of 10mm, and after the sheathing is finished, the heating and sheathing unit returns to the furnace and preserves the temperature for 45-60 min according to the original temperature.
Furthermore, the heating temperature of the conventional alpha + beta region forging is 30-50 ℃ below the transformation point.
The invention has the beneficial effects that: the uniform basket structure Ti-6242 alloy ring forging with all original beta crystal boundaries broken and no flat and coarse crystal boundary alpha phase can be obtained through the steps. After conventional solid solution and aging heat treatment, the forging has the room temperature and high temperature tensile properties equivalent to those of a bi-state structure Ti-6242 alloy forging, higher fracture toughness and thermal creep resistance, and reduced load-holding fatigue sensitivity of the Ti-6242 alloy.
Drawings
FIG. 1 is a low-magnification view of the forging structure;
FIG. 2 is a 100-fold diagram of a forging structure;
FIG. 3 is a 200-fold diagram of a forging structure;
FIG. 4 is a 500-fold diagram of the forging structure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Step one, carrying out conventional alpha + beta region forging on a Ti-6242 alloy bar at the temperature of 30-50 ℃ below a phase transformation point to complete the working procedures of cake upsetting, punching, pre-expansion and the like, wherein the pre-expansion working procedure needs to control the size of a forging stock and reserve 40-50% of deformation for the final heat beta ring rolling forging.
And step two, heating the Ti-6242 alloy ring blank subjected to the two-phase region forging within the temperature range of 25-35 ℃ above the phase transformation point, wherein the heating coefficient is carried out according to 0.7 min/mm-0.9 min/mm, soft sheathing is carried out by adopting aluminum silicate heat-preservation cotton with the thickness of-10 mm after the working procedure is finished, and the temperature is preserved for 45-60 min according to the original temperature after the sheathing is finished.
Step three, performing phase change point rolling on the Ti-6242 alloy blank which is heated and sheathed in the step two, wherein the main control points are as follows: a) the discharging transfer time is controlled within 40 s; b) the speed of the rolling ring is controlled to be 8-10 mm/s, the total reserved deformation is controlled to be 70-80%, and the rolling time is controlled to be 15-20 s.
Step four, rolling the blank rolled on the phase change point in the step three under the phase change point, wherein the main control points are as follows: a) stopping rolling for 5-10 s after the third step is completed; b) and (4) after stopping, performing accelerated rolling by a ring of 4-6 mm/s until the final size of the ring piece is reached, finishing the residual deformation of 20-30%, and controlling the rolling time within 10-15 s, so as to ensure that the time of the whole discharging forging process is controlled within 90 s.
Example 1
The compressor drum for a certain type of engine is made of Ti-6242 titanium alloy, the overall dimension of a forging is phi 560 multiplied by phi 440 multiplied by 125, and the blanking weight is 60 Kg.
By adopting the invention, the processes of upsetting cake, punching and pre-forging are completed by forging the phi 230X 315 specification bar for 3 times at 35 ℃ below the phase change point, and the blank size after pre-forging is phi 405X phi 200X 125.
The beta ring rolling forging process comprises the following steps: heating the forging stock at a phase transition point by a soft sleeve at 30 ℃; the rolling transfer time is 35 s; the rolling at the first stage change point adopts 8mm/s ring speed increase, the rolling is carried out until the size is 500 phi multiplied by phi 355 multiplied by 127, the rolling is stopped for 8s, and the ring speed increase rolling is changed into 5mm/s ring speed increase rolling until the size is 560 phi multiplied by phi 440 multiplied by 128. The structure of the forged piece obtained by the final forged piece is shown in the figures 1-4, and the properties are shown in the table 1.
TABLE 1 mechanical Properties of typical parts
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.
Claims (8)
1. A beta forging method for a Ti-6242 alloy ring forging is characterized by comprising the following steps:
step one, forging a Ti-6242 alloy bar stock in a conventional alpha + beta region to obtain a prefabricated Ti-6242 alloy ring blank; the Ti-6242 alloy ring blank is prepared by reserving 40-50% of deformation for final hot beta ring rolling forging;
step two, heating and sheathing the Ti-6242 alloy ring blank at the phase change point within the temperature range of 25-35 ℃;
step three, rolling the heated and sheathed Ti-6242 alloy ring blank at a phase transformation point, wherein the control point comprises the following steps: a) the discharging transfer time is controlled within 40 s; b) the speed increasing of the rolling ring is controlled to be 8-10 mm/s, the total reserved deformation is controlled to be 70-80%, and the rolling time is controlled to be 15-20 s;
step four, rolling the rolled Ti-6242 alloy ring blank under a phase transformation point, wherein the control points comprise: a) stopping for 5-10 s after the rolling is finished in the third step; b) and (4) after stopping, performing accelerated rolling by a ring of 4-6 mm/s until the final size of the ring piece is reached, finishing the residual deformation of 20-30%, and controlling the rolling time within 10-15 s, so as to ensure that the time of the whole discharging forging process is controlled within 90 s.
2. The method of claim 1, wherein the heating coefficient in step two is 0.7min/mm to 0.9 min/mm.
3. The method according to claim 1, wherein aluminum silicate heat-preservation cotton with the thickness of 10mm is adopted for soft covering in the second step, and the temperature is preserved for 45-60 min after covering and returning to the furnace.
4. The method of claim 1, wherein the heating temperature for conventional α + β region forging is 30 ℃ to 50 ℃ below the transformation point.
5. A Ti-6242 alloy ring forging beta forging device, characterized by, includes:
the conventional forging unit is used for forging the Ti-6242 alloy bar stock in a conventional alpha + beta region to obtain a prefabricated Ti-6242 alloy ring blank; the Ti-6242 alloy ring blank is prepared by reserving 40-50% of deformation for final hot beta ring rolling forging;
the heating and sheathing unit is used for heating and sheathing the Ti-6242 alloy ring blank at the phase change point within the temperature range of 25-35 ℃;
the first rolling unit is used for rolling the heated and sheathed Ti-6242 alloy ring blank at the phase transformation point, and the control point of the first rolling unit comprises the following steps: a) the discharging transfer time is controlled within 40 s; b) the speed increasing of the rolling ring is controlled to be 8-10 mm/s, the total reserved deformation is controlled to be 70-80%, and the rolling time is controlled to be 15-20 s;
the second rolling unit is used for rolling the rolled Ti-6242 alloy ring blank under the phase transformation point, and the control points comprise: a) stopping for 5-10 s after the rolling is finished in the third step; b) and (4) after stopping, performing accelerated rolling by a ring of 4-6 mm/s until the final size of the ring piece is reached, finishing the residual deformation of 20-30%, and controlling the rolling time within 10-15 s, so as to ensure that the time of the whole discharging forging process is controlled within 90 s.
6. The device according to claim 5, wherein the heating and sheathing unit has a heating coefficient of 0.7min/mm to 0.9 min/mm.
7. The device according to claim 5, wherein the heating and sheathing unit is soft-sheathed by aluminum silicate heat-preservation cotton with the thickness of 10mm, and after sheathing is finished, the temperature is preserved for 45-60 min according to the original temperature in a furnace returning process.
8. The apparatus of claim 5, wherein the heating temperature for the conventional α + β region forging is 30 ℃ to 50 ℃ below the transformation point.
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|---|---|---|---|---|
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| CN111318581A (en) * | 2020-03-19 | 2020-06-23 | 中国科学院金属研究所 | Manufacturing method of basket structure titanium alloy large-size ring piece |
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| CN112222341A (en) * | 2020-10-16 | 2021-01-15 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Manufacturing method of TC17 titanium alloy die forging |
| CN112642976A (en) * | 2020-12-01 | 2021-04-13 | 太原理工大学 | Two-stage non-isothermal forging method for controlling titanium alloy beta forging texture |
-
2021
- 2021-12-15 CN CN202111534040.0A patent/CN114472766A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106425327A (en) * | 2016-11-30 | 2017-02-22 | 西北有色金属研究院 | Preparation method for large-specification TC4 titanium alloy ring piece |
| CN109079072A (en) * | 2017-09-29 | 2018-12-25 | 贵州安大航空锻造有限责任公司 | Large-scale TC4 alloy rings structural homogenity forging method |
| CN109439936A (en) * | 2018-12-19 | 2019-03-08 | 宝钛集团有限公司 | The preparation method of strong toughness titanium alloy super large-scale ring material in a kind of |
| CN111069496A (en) * | 2019-12-30 | 2020-04-28 | 西北工业大学 | Preparation method of GH4738 alloy crystal homogenizing ring forging |
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| CN112642976A (en) * | 2020-12-01 | 2021-04-13 | 太原理工大学 | Two-stage non-isothermal forging method for controlling titanium alloy beta forging texture |
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