CN112719181A - Forging method of GH2909 alloy annular piece - Google Patents
Forging method of GH2909 alloy annular piece Download PDFInfo
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- CN112719181A CN112719181A CN202011514597.3A CN202011514597A CN112719181A CN 112719181 A CN112719181 A CN 112719181A CN 202011514597 A CN202011514597 A CN 202011514597A CN 112719181 A CN112719181 A CN 112719181A
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- blank
- reaming
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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
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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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
- B21J5/002—Hybrid process, e.g. forging following casting
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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
Abstract
The invention relates to the field of forging hot working, and discloses a forging method of an GH2909 alloy annular piece. The GH2909 alloy ring piece forging forming method strictly controls the forging temperature, deformation and reaming time of each link, particularly the continuous production processes of heading cake punching, pre-reaming and final reaming, and must ensure that the heading cake is pre-reamed through hot material returning after punching, the heading cake is finally reamed through hot material returning after pre-reaming, and finally a matched heat treatment system is selected for heat treatment, so that the final grain size and the mechanical property of the product meet the final required requirements. The mass production efficiency of the GH2909 annular forging is improved, the energy is saved, and a selection way is provided for the preparation of the GH2909 annular forging.
Description
Technical Field
The invention belongs to the technical field of forging hot working, and particularly relates to a forging method of a GH2909 alloy annular piece.
Background
The GH2909 high-temperature alloy has high strength and plasticity, low thermal expansion coefficient, almost constant elastic modulus, good comprehensive mechanical properties such as oxidation resistance, cold and hot fatigue and the like at the temperature of below 650 ℃, can reduce the clearance between a rotating part and a static part, realize clearance control, save energy, reduce consumption, improve the efficiency of an engine and prolong the service life of parts, is an ideal material for aerospace engines, and has been widely used as an outer turbine ring, a sealing ring and the like of the engine abroad. The alloy is researched in advance from 1996 in China for more than 20 years, and at present, the alloy is used for manufacturing various engine parts.
In GH2909 alloy, the structure after two rounds of solid solution and two rounds of aging is mainly composed of gamma 'phase, epsilon phase, laves phase, MC and the like, the gamma' phase has a large contribution to strength and is a main strengthening phase, the epsilon phase and laves phase are generally distributed in a block or rod shape, and a large amount of precipitates of the epsilon phase and laves phase can pin the migration of grain boundaries, thereby being beneficial to improving the deformation coordination between the interior of the crystal and the grain boundaries, reducing the stress concentration of the grain boundaries, preventing cracks from being generated from the grain boundaries at first, effectively preventing the formation and the expansion of the grain boundary cracks, improving the crack resistance and improving the durability of the alloy. When the gamma' phase is well matched with the epsilon phase, the parts can obtain higher strength and lower notch sensitivity, and the durable service life of the parts can be greatly prolonged.
The ring pieces produced by different temperatures, different deformation amounts, different heating times and different heat treatment regimes have different structures and mechanical properties. And if the combination of the GH2909 high-temperature alloy ring piece is subjected to permanent easy-breaking gap, the permanent performance of the ring piece is easily unqualified if the forging temperature, the deformation and the fire frequency are not controlled properly. The invention provides a forming method for improving the durability of a GH2909 alloy annular piece.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problem that the GH2909 annular forging has low or unqualified durability, the forging method of the GH2909 annular forging effectively improves the mechanical property, especially the durability, of the GH2909 annular forging, ensures that the structure and the mechanical property of the forging meet the final use requirement, enables the forging to be produced smoothly, and reduces the waste of resources caused by the scrapping problem.
The technical scheme of the invention is as follows:
a GH2909 alloy ring forging method comprises the following steps:
the method comprises the following steps: preheating a ring-shaped part tool, a punch and a clamp;
step two: heating the blank to a blank making temperature and preserving heat; after the heat preservation is finished, discharging the blank out of the furnace, performing soft covering on the blank, and performing primary hot material returning heat preservation on the blank after the soft covering;
step three: performing cake upsetting and punching on the blank subjected to the first hot material returning and heat preservation to obtain a ring blank;
step four: performing secondary hot material returning and heat preservation on the ring blank subjected to the heading cake punching;
step five: pre-reaming the ring blank subjected to heat preservation by the second hot material returning for the first time; after pre-reaming and first firing are finished, returning the hot material of the ring blank for the third time to the furnace for heat preservation;
step six: pre-reaming the ring blank subjected to heat preservation after the third hot material is returned to the furnace for the second time; after pre-reaming and second firing are finished, returning the hot material of the ring blank for the fourth time to the furnace for heat preservation;
step seven: and finally reaming the ring blank after the fourth time of hot material returning and heat preservation is finished.
Further, in the first step, the preheating temperature is 200-300 ℃. Effectively ensure the forging temperature of the blank
Further, in the second step, the process of heating the blank to the blank making temperature is as follows: when the temperature of the blank does not exceed 750 ℃, the blank is put into a furnace, preheated to 750 ℃, and kept at the temperature of 0.8min/mm H, wherein H is the minimum thickness of the effective section of the annular piece and is unit mm; after the incubation was completed, the blank was further heated to 1040 ℃ and incubated for 0.6min/mm x H. Various phase components in the GH2909 alloy can be correspondingly dissolved at 1040 ℃, the grain size is grown up to a certain extent but not exceeds 4-level grain size, and the method plays an important role in ensuring the grain size and the mechanical property of the final ring.
Further, in the second step, when the first hot material is returned to the furnace for heat preservation, the blanks after the soft covering are heated to 1040 ℃ and heat preservation is carried out for 30 min. The temperature loss is reduced by soft covering, and the forging temperature of the blank is ensured;
further, in the third step, the deformation of the upset cake during punching is 65-80%, and the upset cake and punching time is 90-150 s. The deformation of the upset cake punching is sufficient to ensure more sufficient recrystallization, and the upset cake punching time is controlled to ensure the final forging temperature of the blank.
Further, in the fourth step, the ring blank is heated to 1020 ℃ and then is subjected to heat preservation for 0.6min/mm H during the second hot material returning and heat preservation.
Further, in the fifth step, the pre-reaming first thermal deformation amount is 20-30%, and the pre-reaming first thermal deformation time is 20-60 s; and heating the ring blank to 1020 ℃ during the third hot material return, and then preserving the heat for 0.6min/mm H.
Further, in the sixth step, the pre-reaming second thermal deformation amount is 20-30%, and the pre-reaming second thermal deformation time is 20-60 s.
Further, in the sixth step, the ring blank is heated to 1010 ℃ and then is subjected to heat preservation for 0.6min/mm H when the fourth time of hot material is returned to the furnace and heat preservation is carried out. And (3) continuous hot material remelting avoids cooling in the forging process, and can effectively inhibit the precipitation of the Laves phase in the forging process so as to ensure the content of the precipitated gamma 'phase and epsilon phase in the ring-shaped member structure after two-round solid solution and two-round aging, so that the gamma' phase and the epsilon phase are well matched, the forge piece obtains higher strength and lower notch sensitivity, and the mechanical property of the forge piece is ensured.
Further, in the seventh step, the final reaming deformation amount is 30% -40%, and the final reaming deformation time is 40-80 s.
The invention has the beneficial effects that: the invention relates to a forging method for improving the endurance quality of a GH2909 alloy ring piece, which strictly controls the forging temperature, deformation and reaming time of each process, particularly, the three processes of cake upsetting, punching, pre-reaming and final reaming are continuously produced most importantly, and finally, a matched heat treatment system is selected for heat treatment.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the embodiment of the present invention will be briefly calculated. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic high-power structure diagram of a GH2909 alloy ring forging method forged ring.
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.
A forging method of a GH2909 alloy annular piece comprises the following specific steps:
step 1: preheating the tool, the punch and the clamp to enable the temperature of the tool, the punch and the clamp to reach 200-300 ℃.
Step 2: heating the blank in an electric furnace to the blank making temperature and preserving heat, and performing upset cake punching and heating specification: heating the cold material, feeding the blank into a furnace at the temperature of less than or equal to 750 ℃, preheating to 750 ℃, and keeping the temperature for 0.8min/mm H, wherein H is the minimum thickness of the effective section of the annular piece and is unit mm; heating to 1040 deg.C, holding for 0.6min/mm H, tapping the blank for soft covering, returning to 1040 deg.C, holding for 30min, tapping, forging,
and (6) upsetting cakes and punching holes. Controlling the deformation of the upset cake punching: 65 to 80 percent. Controlling the upsetting cake and punching time: 120s + -30 s.
And 3, step 3: and (3) directly returning the ring blank obtained in the step (2) to the furnace by hot material, pre-reaming after heat preservation, pre-reaming for 2 fire in total, not preheating the hot material to the furnace, pre-reaming for the first fire at the heating temperature of 1020 ℃ for 0.6min/mm H, returning the ring blank to a prepared electric furnace at the temperature of 1020 ℃ in advance for heating and heat preservation, and discharging the ring blank from the furnace for pre-reaming for the first fire after the required heat preservation time is reached. Controlling the pre-reaming first thermal deformation: 20 to 30 percent. And controlling the pre-reaming first thermal deformation time for 40s +/-20 s.
And 4, step 4: and (3) directly returning the ring blank obtained in the step (3) to the furnace, returning the ring blank to a prepared electric furnace at 1020 ℃ in advance for heating and heat preservation, wherein the heat preservation time is 0.6min/mm H, and discharging the ring blank from the furnace for pre-reaming a second fire after the required heat preservation time is reached. Controlling the pre-reaming second thermal deformation: 20 to 30 percent. And controlling the pre-reaming first thermal deformation time for 40s +/-20 s.
And 5, step 5: returning the ring blank obtained in the step 4 to the furnace directly by hot material, wherein the final reaming heating temperature is 1010 ℃, the heat preservation time is 0.6min/mm H, returning the ring blank to a prepared electric furnace at 1010 ℃ in advance for heating and heat preservation, and discharging the ring blank out of the furnace for final reaming after the required heat preservation time is reached; and (3) controlling final reaming deformation: 30 to 40 percent. And controlling the final reaming deformation time to be 60s +/-20 s.
And 6, step 6: and (5) selecting a matched heat treatment system according to the heat treatment specification, and carrying out heat treatment on the ring piece obtained in the step (5).
And 7, step 7: and (3) performing physical and chemical detection on the forged piece, wherein all indexes of the structure and the mechanical property of the forged piece finally reach standard requirements, and the use requirements of subsequent forged pieces are met.
And (3) monitoring the material temperature by using a polling instrument or a digital display meter during the heating in the steps 3, 4 and 5, and controlling the high-temperature heating temperature of the blank to be within +/-1 ℃ tolerance of the specified temperature.
Examples
The forging shape is annular forging, and the overall dimension is: phi 860 +/-1 multiplied by phi 770 +/-1 multiplied by 75 +/-1, the weight of the forging is 58.2Kg, the blanking specification is phi 200 multiplied by 320, the weight is as follows: 82.6 Kg. The specific process steps for forming the annular forging are as follows:
step 1: preheating the tool, the punch and the clamp to enable the temperature of the tool, the punch and the clamp to reach 200-300 ℃.
Step 2: the blank with the specification of phi 200 multiplied by 320 is put into an electric furnace, and the heating specification is as follows: and (3) multiplying 160min at 750 ℃ and 120min at 1040 ℃ for preserving heat, discharging from the furnace for soft covering after reaching the heat preservation time, preserving heat at 1040 ℃ for 30min, discharging from the furnace for forging, and punching the upset cake to obtain the size: phi 413 × phi 170 ± 10 × 80 ± 3, deformation: 74%, forging time: 120s + -30 s.
And 3, step 3: and (3) pre-reaming the ring blank obtained in the step (2) by returning the ring blank direct hot material to the furnace, wherein the pre-reaming is carried out by 2 times, and the pre-reaming is carried out by a first fire heating specification: 1020 ℃ x 50min, pre-reaming first fire size: phi 475 multiplied by phi 290 +/-10 multiplied by 80 +/-3, deformation amount 24%, reaming time: 40s + -20 s.
And 4, step 4: and (3) returning the ring blank direct hot material obtained in the step (3) to a furnace for pre-reaming second fire, wherein the pre-reaming second fire is standardized by heating: 1020 ℃ x 50min, pre-reaming second fire size: phi 585 × phi 450 ± 10 × 80 ± 3, deformation 26%, reaming time: 40s + -20 s.
And 5, step 5: and (5) directly returning the ring blank obtained in the step (5) to the furnace by heating the hot material, wherein the final reaming heating temperature is 1010 ℃, and the ring blank is sent back to a prepared 1010 ℃ electric furnace for heating and heat preservation, and the final reaming heating is standard: 1010 ℃ x 50min, final hole enlargement size: phi 860 +/-5 multiplied by phi 770 +/-5 multiplied by 75 +/-5, deformation amount 33%, reaming time: 60s + -20 s.
And (3) monitoring the material temperature by using a polling instrument or a digital display meter during the heating in the steps 3, 4 and 5, and controlling the high-temperature heating temperature of the blank to be within +/-1 ℃ tolerance of the specified temperature.
And 6, step 6: and (5) selecting a matched heat treatment system according to the heat treatment specification, and carrying out heat treatment on the ring piece obtained in the step (5).
And 7, step 7: and (3) performing physical and chemical detection on the forged piece, wherein all indexes of the structure and the mechanical property of the forged piece finally reach standard requirements, and the use requirements of subsequent forged pieces are met.
The structure and the combination durability of the final forged piece obtained according to the forming process scheme are qualified, other mechanical properties are obviously improved, and all indexes reach standard requirements and meet the subsequent use requirements. The grain size of the forged piece is 7 grade, the high-magnification structure photo is shown in figure 1, and the mechanical property data is shown in table 1.
TABLE 1 room temperature, high temperature tensile and durability properties of forgings
The mechanical property, especially the durability, of the GH2909 annular forging produced by the method is obviously improved, the special use performance requirement of the GH2909 annular forging can be met, the batch production efficiency of the GH2909 annular forging is improved, the material utilization rate and the production efficiency are improved, and the GH2909 annular forging is beneficial to the realization of industrial emission reduction and low-carbon manufacturing targets in the current country.
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 (10)
1. A GH2909 alloy annular piece forging method is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: preheating a ring-shaped part tool, a punch and a clamp;
step two: heating the blank to a blank making temperature and preserving heat; after the heat preservation is finished, discharging the blank out of the furnace, performing soft covering on the blank, and performing primary hot material returning heat preservation on the blank after the soft covering;
step three: performing cake upsetting and punching on the blank subjected to the first hot material returning and heat preservation to obtain a ring blank;
step four: performing secondary hot material returning and heat preservation on the ring blank subjected to the heading cake punching;
step five: pre-reaming the ring blank subjected to heat preservation by the second hot material returning for the first time; after pre-reaming and first firing are finished, returning the hot material of the ring blank for the third time to the furnace for heat preservation;
step six: pre-reaming the ring blank subjected to heat preservation after the third hot material is returned to the furnace for the second time; after pre-reaming and second firing are finished, returning the hot material of the ring blank for the fourth time to the furnace for heat preservation;
step seven: and finally reaming the ring blank after the fourth time of hot material returning and heat preservation is finished.
2. The GH2909 alloy ring forging method of claim 1, wherein: in the first step, the preheating temperature is 200-300 ℃.
3. The GH2909 alloy ring forging method of claim 2, wherein: in the second step, the process of heating the blank to the blank making temperature is as follows: when the temperature of the blank does not exceed 750 ℃, the blank is put into a furnace, preheated to 750 ℃, and kept at the temperature of 0.8min/mm H, wherein H is the minimum thickness of the effective section of the annular piece and is unit mm; after the incubation was completed, the blank was further heated to 1040 ℃ and incubated for 0.6min/mm x H.
4. The GH2909 alloy ring forging method of claim 3, wherein: in the second step, the blanks after the soft covering are heated to 1040 ℃ and kept for 30min when the first hot materials are returned to the furnace for heat preservation.
5. The GH2909 alloy ring forging method of claim 4, wherein: in the third step, the deformation of the upset cake punching is 65-80%, and the upset cake punching and punching time is 90-150 s.
6. The GH2909 alloy ring forging method of claim 5, wherein: in the fourth step, the ring blank is heated to 1020 ℃ and then is subjected to heat preservation of 0.6min/mm H during the second hot material returning heat preservation.
7. The GH2909 alloy ring forging method of claim 6, wherein: in the fifth step, the pre-reaming first thermal deformation amount is 20-30%, and the pre-reaming first thermal deformation time is 20-60 s; and heating the ring blank to 1020 ℃ during the third hot material return, and then preserving the heat for 0.6min/mm H.
8. The GH2909 alloy ring forging method of claim 7, wherein: in the sixth step, the pre-reaming second thermal deformation amount is 20-30%, and the pre-reaming second thermal deformation time is 20-60 s.
9. The GH2909 alloy ring forging method of claim 8, wherein: in the sixth step, the ring blank is heated to 1010 ℃ and then is subjected to heat preservation of 0.6min/mm H when the fourth hot material is returned to the furnace and is subjected to heat preservation.
10. The GH2909 alloy ring forging method of claim 9, wherein: and in the seventh step, the final reaming deformation amount is 30-40%, and the final reaming deformation time is 40-80 s.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114309443A (en) * | 2021-12-29 | 2022-04-12 | 西南铝业（集团）有限责任公司 | Preparation method of 6061T6 forged ring |
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