CN115213251A - Preparation method of GH4698 alloy small-size bar - Google Patents
Preparation method of GH4698 alloy small-size bar Download PDFInfo
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- CN115213251A CN115213251A CN202210288713.7A CN202210288713A CN115213251A CN 115213251 A CN115213251 A CN 115213251A CN 202210288713 A CN202210288713 A CN 202210288713A CN 115213251 A CN115213251 A CN 115213251A
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 29
- 239000000956 alloy Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 47
- 238000005242 forging Methods 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 4
- 238000000265 homogenisation Methods 0.000 claims description 3
- 238000010304 firing Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910000601 superalloy Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
-
- 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
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Abstract
The invention provides a preparation method of a GH4698 alloy small-size bar, which specifically comprises the following steps: cogging and forging: carrying out multi-fire upsetting and drawing-out on the GH4698 cast ingot to phi 100-200 mm, carrying out air cooling, and cleaning the surface; intermediate rolling: rolling the bar with the diameter of 100 mm-200 mm after cogging forging to the diameter of 40 mm-70 mm for one time, and cooling in air to remove the surface damage; rolling a finished product: and (3) rolling the bar material with the diameter of 40-70 mm after the middle rolling for one time by one fire, and performing air cooling to obtain the bar material with the diameter of 5-30 mm which meets the standard requirement. According to the invention, through reasonable collocation of deformation modes, the structure uniformity of the bar is improved, and the performance of the heat-treated bar meets the corresponding standard requirement.
Description
Technical Field
The invention relates to the technical field of nonferrous metal processing, in particular to a preparation method of a GH4698 alloy small-size bar.
Background
GH4698 is a Ni-based precipitation strengthening type wrought superalloy developed from Russian alloys, and has a use temperature of about 750-800 ℃. The alloy has high lasting strength and tensile strength within the range of 550-800 ℃, good comprehensive performance and stable structure after long-term use. The bearing part is suitable for manufacturing long-life heavy bearing parts such as engine turbine discs and compressor discs, and is widely applied to large-specification parts of ship gas turbines. In recent years, because of its excellent performance, it has also been used in the direction of high-pressure turbine disks of aircraft engines, ring rolling stock, and fasteners.
The GH4698 alloy has more element types, wherein the sum of the contents of Al, ti and Nb elements is as high as 5.70-6.75%, and the content of C is about 0.03-0.07%. Therefore, the alloy has a large resistance to deformation and is not easily worked during plastic forming. Secondly, the processing plasticity of the alloy is poor, and the alloy belongs to an easily-cracked alloy. In addition, the alloy belongs to a coarse-grained alloy, the heat treatment solid solution mode is excessive solid solution, the structure uniformity is difficult to control, and particularly, the aero-engine has the requirement on the grain size of a small-sized bar material of 2-6 grades.
Disclosure of Invention
The technical problem solved by the invention is to provide a preparation method of a GH4698 alloy small-sized bar, which solves the technical problems that the GH4698 alloy has large deformation resistance and is easy to crack and the structure uniformity is difficult to control in the processing process in the prior art, improves the structure uniformity of the bar by reasonably matching deformation modes, ensures that the macrostructure of the bar with the diameter of 5mm to 30mm is uniform, ensures that the grain size reaches 2-3 grades, successfully breaks through the requirement of 2-6 grades on the grain size of the GH4698 alloy small-sized bar for an aeroengine, ensures that the performance of the bar after heat treatment meets the corresponding standard requirement, and has wide applicability in the field of GH4698 alloy preparation. In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a GH4698 alloy small-size bar specifically comprises the following steps:
step 1: cogging and forging: carrying out multi-fire upsetting and drawing-out on the GH4698 cast ingot to phi 100-200 mm, carrying out air cooling, and cleaning the surface;
step 2: intermediate rolling: rolling the bar with the diameter of 100 mm-200 mm after cogging forging to the diameter of 40 mm-70 mm for one time, and cooling in air to remove the surface damage;
and 3, step 3: rolling a finished product: and (3) rolling the bar material phi of 40mm to 70mm after the middle rolling for one time by fire, and cooling in air to obtain the bar material phi of 5mm to 30mm meeting the standard requirement.
Preferably, the ingot casting in the step 1 needs to be subjected to homogenization heat treatment before cogging and forging, the cogging and forging comprises seven sparks including one-time upsetting and six-time drawing, axial upsetting and drawing deformation are carried out on a 8000T quick forging machine, the heating temperature is 1100-1200 ℃, the temperature is kept for 2-4 hours, the deformation amount of each-time upsetting and drawing is 30-40%, the surface temperature of the blank after forging is more than 850 ℃ and less than 1000 ℃, and air cooling is carried out after forging.
Preferably, the rolling temperature of the intermediate rolling in the step 2 is 1080-1170 ℃, the temperature is kept for 1-2 hours, the interval of each pass is 5-10 s, and the surface temperature of the rolled blank is more than 900 ℃ and less than 1000 ℃.
Preferably, the rolling temperature of the finished product in the step 3 is 1050-1140 ℃, the temperature is kept for 1-2 hours, the interval of each pass is 5-10 s, and the surface temperature of the rolled blank is larger than 850 ℃ and smaller than 1000 ℃.
Preferably, the intermediate rolling and the finish rolling in the step 2 and the step 3 both adopt a horizontal rolling mill.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, a rapid forging machine and a transverse rolling mill are used for producing GH4698 high-temperature alloy bars with the specification of phi 5 mm-phi 30mm, the structural uniformity of the bars is improved through reasonable matching of deformation modes, the properties of the bars after heat treatment meet corresponding standard requirements, and various performance requirements and the grain size 2-6 grade requirements of GH4698 small-specification bars are successfully broken through.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a real object diagram of GH4698 bars with specification of phi 10mm and phi 18 mm;
FIG. 2 is a schematic diagram of a phi 10mm specification GH4698 bar high power structure (longitudinal direction) of the invention;
FIG. 3 is a schematic view of a phi 10mm specification GH4698 bar high power organization (transverse) of the invention;
FIG. 4 is a schematic diagram of the high power structure (longitudinal direction) of GH4698 bar material with a phi 18mm specification;
FIG. 5 is a schematic view of the high power organization (transverse) of GH4698 bar with the specification of phi 18 mm.
Detailed Description
In order to make the technical means, the creation features, the work flow and the using method of the present invention easily understand and understand the purpose and the efficacy, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, but 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 inventive step, and other conclusions that can be drawn without inventive extensions, are intended to fall within the scope of the present invention.
Example 1
A preparation method of a GH4698 alloy small-size bar specifically comprises the following steps:
step 1: heating temperature of each heating time of cogging forging is 1100 ℃, preserving heat for 2 hours, homogenizing heat treatment of the cast ingot is completed before cogging forging, a 8000T fast forging machine is used for cogging forging the cast ingot with the specification of phi 480mm, the cast ingot is upset and drawn to a bar with the specification of phi 100mm through seven heating times, deformation modes are one-heating upsetting and six-heating drawing-out, deformation amount of upsetting and drawing-out is 30%, surface temperature of the blank after forging is 853 ℃, air cooling is performed after forging, and 100% of damage is cleared;
and 2, step: rolling and deforming bars with the specification of phi 100mm into bars with the specification of phi 40mm on a transverse rolling mill, heating the bars at 1080 ℃, preserving the heat for 1 hour at the interval of 5s per pass, cooling the rolled blanks at 907 ℃ after rolling, and clearing the flaws by 100%;
and step 3: rolling and deforming the bar with the specification of phi 40mm into a bar with the specification of phi 10mm on a transverse rolling mill, heating the bar at 1050 ℃, keeping the temperature for 1 hour, keeping the interval of each pass for 5s, and cooling the rolled blank in air after rolling, wherein the surface temperature of the rolled blank is 858 ℃.
Example 2
A preparation method of a GH4698 alloy small-size bar specifically comprises the following steps:
step 1: heating temperature of each heating time of cogging forging is 1150 ℃, preserving heat for 3 hours, homogenizing heat treatment is completed on an ingot before cogging forging, a 8000T fast forging machine is used for cogging forging the ingot with the specification of phi 480mm, the ingot is upset and drawn to a bar with the specification of phi 150mm through seven heating times, deformation modes are one-heating upsetting and six-heating drawing-out, deformation amount of upsetting and drawing-out is 35%, surface temperature of the forged blank is 930 ℃, air cooling is performed after forging, and 100% of damage is cleared;
step 2: rolling and deforming a bar material with the specification of phi 150mm into a bar material with the specification of phi 55mm on a transverse rolling mill, wherein the heating temperature is 1120 ℃, the heat preservation time is 1.5 hours, the interval of each pass is 7s, the surface temperature of a rolled blank is 951 ℃, air cooling is carried out after rolling, and 100% of damage is removed;
and 3, step 3: rolling and deforming the phi 55mm specification bar into a phi 18mm specification bar on a transverse rolling mill, heating the bar at 1090 ℃, keeping the temperature for 1.5 hours at an interval of 7s per pass, and cooling the rolled blank in air after rolling at 921 ℃.
Example 3
A preparation method of a GH4698 alloy small-size bar specifically comprises the following steps:
step 1: heating temperature of each firing forging is 1200 ℃, heat preservation is carried out for 4 hours, homogenization heat treatment is completed before the ingot casting is subjected to the firing forging, a 8000T quick forging machine is used for the firing forging of the ingot casting with the phi of 480mm, the ingot casting with the phi of 200mm is subjected to seven firing upsetting and drawing, the deformation mode is one-firing upsetting and six-firing drawing, the deformation amount of the upsetting and the drawing is 40%, the surface temperature of the blank after the forging is 996 ℃, air cooling is carried out after the forging, and 100% damage clearing is carried out;
step 2: rolling and deforming a bar with the specification of phi 200mm into a bar with the specification of phi 70mm on a transverse rolling mill, wherein the heating temperature is 1170 ℃, the heat preservation time is 2 hours, the interval of each pass is 10s, the surface temperature of a rolled blank is 990 ℃, and air cooling is carried out after rolling, and the damage is cleared by 100%;
and 3, step 3: rolling and deforming the bar with the diameter of 70mm into a bar with the diameter of 30mm on a transverse rolling mill, heating the bar at 1140 ℃, keeping the temperature for 2 hours at the interval of 10s per pass, and cooling the rolled blank after rolling at 989 ℃.
Example 4
The performance test of the GH4698 high-temperature alloy bar prepared by the method of the invention comprises the following steps:
the mechanical property data of 2 batches of GH4698 high-temperature alloy bars with the specification of phi 10mm and phi 18mm produced by adopting the method of the invention to carry out multi-batch production are shown in Table 1.
TABLE 1GH4698 mechanical Properties of superalloy bars
As can be seen from Table 1, the performance meets the standard requirements and the margin is large. As can be seen from the results in Table 1 and FIGS. 1 to 5, the GH4698 superalloy small-sized bar produced by the forging process of the present invention has uniform structure, uniform and fuzzy bar transverse direction, and no metallurgical defects such as shrinkage cavity, cracks, slag inclusion, etc.; the high power tissue is relatively uniform and fine, and the average grain size is 2-3 grades. The performance test result completely meets the standard requirement.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A preparation method of a GH4698 alloy small-size bar is characterized by comprising the following steps:
step 1: cogging and forging: upsetting the GH4698 cast ingot for multiple times, drawing out to phi 100-200 mm, air cooling, and cleaning the surface;
and 2, step: intermediate rolling: rolling the bar with the diameter of 100 mm-200 mm after cogging forging to the diameter of 40 mm-70 mm for one time, and cooling in air to remove the surface damage;
and step 3: rolling a finished product: and (3) rolling the bar material phi of 40mm to 70mm after the middle rolling for one time by fire, and cooling in air to obtain the bar material phi of 5mm to 30mm meeting the standard requirement.
2. The preparation method of the GH4698 alloy small-size bar as claimed in claim 1, wherein the preparation method comprises the following steps: in the step 1, the ingot needs to be subjected to homogenization heat treatment before cogging and forging, the cogging and forging are carried out by seven sparks, the steps comprise one-time upsetting and six-time drawing, axial upsetting and drawing deformation are carried out on a 8000T quick forging machine, the heating temperature is 1100-1200 ℃, the temperature is kept for 2-4 hours, the deformation amount of each-time upsetting and drawing is 30-40%, the surface temperature of the blank after forging is more than 850 ℃ and less than 1000 ℃, and air cooling is carried out after forging.
3. The preparation method of the GH4698 alloy small-size bar as claimed in claim 1, wherein the preparation method comprises the following steps: the rolling temperature of the middle rolling in the step 2 is 1080-1170 ℃, the heat preservation is carried out for 1-2 hours, the interval of each pass is 5-10 s, and the surface temperature of the rolled blank is more than 900 ℃ and less than 1000 ℃.
4. The method for preparing GH4698 alloy small-size bars as claimed in claim 1, wherein the method comprises the following steps: the rolling temperature of the finished product in the step 3 is 1050-1140 ℃, the temperature is kept for 1-2 hours, the interval of each pass is 5-10 s, and the surface temperature of the rolled blank is more than 850 ℃ and less than 1000 ℃.
5. The preparation method of the GH4698 alloy small-size bar as claimed in claim 1, wherein the preparation method comprises the following steps: and the intermediate rolling and the finished product rolling in the step 2 and the step 3 both adopt a transverse rolling mill.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116240475A (en) * | 2023-02-14 | 2023-06-09 | 西部超导材料科技股份有限公司 | Method for refining grain size of GH4698 alloy bar |
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| CA2980063A1 (en) * | 2016-11-28 | 2018-05-28 | Daido Steel Co., Ltd. | Method for producing ni-based superalloy material |
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| WO2019172000A1 (en) * | 2018-03-06 | 2019-09-12 | 日立金属株式会社 | Method for manufacturing super-refractory nickel-based alloy and super-refractory nickel-based alloy |
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| CN113877982A (en) * | 2021-08-26 | 2022-01-04 | 北京钢研高纳科技股份有限公司 | Hardly-deformable GH4720Li high-temperature alloy small-size bar, preparation method and blade forging |
| CN114178339A (en) * | 2021-12-09 | 2022-03-15 | 宁夏中色金航钛业有限公司 | Fine-grain Ti for 3D printing additive powder making2AlNb alloy bar and preparation method thereof |
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2022
- 2022-03-22 CN CN202210288713.7A patent/CN115213251A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2980063A1 (en) * | 2016-11-28 | 2018-05-28 | Daido Steel Co., Ltd. | Method for producing ni-based superalloy material |
| WO2019172000A1 (en) * | 2018-03-06 | 2019-09-12 | 日立金属株式会社 | Method for manufacturing super-refractory nickel-based alloy and super-refractory nickel-based alloy |
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| CN114178339A (en) * | 2021-12-09 | 2022-03-15 | 宁夏中色金航钛业有限公司 | Fine-grain Ti for 3D printing additive powder making2AlNb alloy bar and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116240475A (en) * | 2023-02-14 | 2023-06-09 | 西部超导材料科技股份有限公司 | Method for refining grain size of GH4698 alloy bar |
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