Forging forming method of GH6783 alloy annular forge piece for aviation
By controlling the forging temperature, deformation and heat treatment process, the problems of coarse grains and unqualified persistent plasticity of GH6783 alloy ring forgings were solved, and the manufacture of GH6783 ring forgings with excellent performance was achieved.
Patent Information
- Application Number
- CN202510890546.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2025-09-12
AI Technical Summary
GH6783 alloy ring forgings have coarse grains and unsatisfactory long-term plasticity, which is difficult to solve with appropriate thermal processing technology and heat treatment system in existing technology.
Preheating tooling and fixtures are used to control the forging temperature and deformation, combined with inner hole processing and final rolling processes, followed by solid solution and aging heat treatment to ensure alloy structure matching.
GH6783 ring forgings with an average grain size of Grade 5 or finer can be stably manufactured, offering excellent performance and meeting the requirements of aviation applications.
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Figure CN120619230A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of aviation engines and relates to a forging method of a GH6783 alloy ring forging for aviation. Background Art
[0002] GH6783 is an Fe-Ni-Co-based, oxidation-resistant, low-expansion high-temperature alloy with low density and good notch sensitivity. However, its room temperature and 650°C strengths are relatively low, and it is difficult to meet the requirements for long-term ductility. In this alloy, the β phase is divided into two types: the primary β phase is larger and already exists in large quantities during hot working below 1150°C; the secondary β phase forms during β-aging at 845°C. Research has shown that varying the hot working process and heat treatment schedule affects the γ' phase precipitation behavior and mechanical properties of the GH6783 alloy. Selecting the appropriate hot working process and heat treatment schedule can achieve excellent microstructure and overall performance.
[0003] The grain size of GH6783 rings is extremely sensitive to the influence of deformation temperature, deformation amount and heat treatment system when they are produced by free forging hammers. During the forming process, the temperature and deformation amount need to be well matched to make the forged grain size appropriate. Summary of the Invention
[0004] Purpose of the invention: The present invention provides a forging method for GH6783 alloy ring forgings for aviation use, which solves the problem of coarse grains and unqualified long-term plasticity of GH6783 alloy forgings.
[0005] Technical solution: Provided is a forging method for a GH6783 alloy ring forging, comprising: In one fire, the punch and fixture of the ring tooling are preheated, and the GH6783 bar is heated to a deformation temperature of 1110-1130°C. The holding time is calculated based on the actual thickness at 1 minute / mm. The bar is deformed by 30%-50% through upsetting to obtain the preset ring blank size. The ring blank is punched so that the inner diameter of the hole is 25%-40% of the outer diameter to obtain a hollow ring blank. After forging, it is air-cooled and the final forging temperature is ≥980°C. Machining the inner hole of the hollow ring blank after forging; The ring blank after the inner hole is machined is subjected to final rolling; Heat treatment.
[0006] Furthermore, the ring blank after the inner hole is machined is subjected to final rolling, including: Preheat the core roller and heat the ring blank to a deformation temperature of 1110~1130℃. The holding time is calculated based on the actual thickness at 1min / mm, so that the inner hole size is 75%~85% of the outer diameter, and the thermal shrinkage rate is calculated as 1.6%. Use the core roller to roll and expand the inner hole to obtain a ring, and then air-cool it after forging. The core roller feed speed is 0.5~0.8mm / s, the deformation amount per fire is 28%~40%, and the final forging temperature is ≥980℃. Furthermore, the heat treatment includes solution treatment and aging.
[0007] Further, solid solution, including: Heat the forged GH6783 alloy to 1105~1120℃, keep it warm for a while, the holding time is 0.5~1min / mm, and then air cool it.
[0008] Furthermore, timeliness includes: First heat to 845℃, keep warm for 2h, cool to room temperature by air cooling, then heat to 720℃, keep warm for 8h, cool to 620℃ at a rate of 55℃ / h, keep warm for 8h, and air cool.
[0009] Furthermore, after the heat treatment, the method further comprises: The forgings were subjected to physical and chemical tests, and all performance indicators met the standards and the grain size met the requirements.
[0010] Furthermore, the inner hole of the hollow ring blank after forging is machined, including: Turn the inner hole, with a machining allowance of 3~5mm; The upper and lower end surfaces of the inner hole are chamfered, sandblasted and polished.
[0011] Beneficial effects: The present invention provides a forging method for GH6783 alloy ring forgings for aviation use. By providing appropriate matching of forging heating temperature, forging deformation, ring speed increase, and heat treatment system, GH6783 ring forgings with an average grain size of grade 5 or finer and excellent performance are stably manufactured, thus solving the problems of coarse grains and unqualified long-term plasticity of GH6783 alloy forgings. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is the microstructure diagram of the ring after heat treatment. DETAILED DESCRIPTION
[0013] The present invention provides a forging method for a GH6783 alloy ring forging for aviation use, which mainly comprises the following steps: (1) Preheat the punch and fixture of the ring tooling, heat the GH6783 bar to a deformation temperature of 1110~1130℃, and calculate the holding time according to the actual thickness at 1min / mm. After upsetting, deform it by 30%~50% to obtain a suitable cake size. When upsetting, cover the upper and lower ends of the blank with insulation cotton, and use the method of turning over and pressing to evenly distribute the deformation. The forging ratio is required to be less than 3; punch the cake blank so that the inner diameter of the hole is 25%~40% of the outer diameter to obtain a hollow ring blank. The final forging temperature is ≥980℃, and air cooling is applied after forging. (2) The inner hole of the hollow ring blank after forging is machined, and the inner hole is turned 3~5mm on one side, and the upper and lower end surfaces of the inner hole are chamfered, sandblasted, and polished; (3) The ring blank after the inner hole is machined is finished rolled, and the GH6783 bar is heated to a deformation temperature of 1110~1130℃. The holding time is calculated according to the actual thickness at 1min / mm, so that the inner hole size is 75%~85% of the outer diameter, the thermal shrinkage rate is calculated as 1.6%, the core roller feed speed is 0.5~0.8mm / s, and the deformation amount per fire reaches 28%~40% before rolling into a ring. The final forging temperature is ≥980℃, and air cooling is performed after forging. (4) Heat treatment: Solution treatment: Heat the forged GH6783 alloy to a temperature in the range of 1105-1120°C, keep it warm for a period of time (holding time is 0.5-1 min / mm), and then air cool it. Aging: first heat to 845℃, keep warm for 2h, cool to room temperature by air cooling, then heat to 720℃, keep warm for 8h, cool to 620℃ at a rate of 55℃ / h, keep warm for 8h, and air cool; (5) Physical and chemical: The forgings are subjected to physical and chemical tests, and all performance indicators meet the standards and the grain size meets the requirements.
[0014] The microstructure of the ring forged by the method provided by the present invention after heat treatment is as follows: Figure 1 As shown in the figure, the main precipitated phases are γ' phase, β phase and MC carbide. γ' phase is the main strengthening phase in GH6783 alloy. β phase is a major precipitated phase in the alloy, exhibiting an ordered body-centered cubic structure. γ' phase occurs in two sizes: large cubic γ' particles and small irregular γ' particles. Fine stripes and large granules of β phase are distributed within the grains and at grain boundaries. The average grain size is 6-7. Overall performance is good. Room temperature tensile properties are shown in Table 1, high temperature tensile properties in Table 2, and combined rupture properties in Table 3.
[0015] Table 1
[0016] Table 2
[0017] Table 3
[0018] The GH6783 ring formed by rolling using the method of the present invention has excellent internal structure and performance, and fully meets the use requirements of the GH6783 ring forging.
Claims
1. A forging method for a GH6783 alloy ring forging, characterized in that: include: In one fire, the punch and fixture of the ring tooling are preheated, and the GH6783 bar is heated to a deformation temperature of 1110-1130°C. The holding time is calculated based on the actual thickness at 1 minute / mm. The bar is deformed by 30%-50% through upsetting to obtain the preset ring blank size. The ring blank is punched so that the inner diameter of the hole is 25%-40% of the outer diameter to obtain a hollow ring blank. After forging, it is air-cooled and the final forging temperature is ≥980°C. Machining the inner hole of the hollow ring blank after forging; The ring blank after the inner hole is machined is subjected to final rolling; Heat treatment.
2. The method according to claim 1, characterized in that The ring blank after the inner hole is machined is subjected to final rolling, including: Preheat the core roller and heat the ring blank to a deformation temperature of 1110-1130°C. The holding time is calculated based on the actual thickness at 1 min / mm, so that the inner hole size is 75%-85% of the outer diameter and the thermal shrinkage rate is calculated as 1.6%. Use the core roller to roll and expand the inner hole to obtain a ring. After forging, air cooling is applied. The core roller feed speed is 0.5-0.8 mm / s, the deformation amount per fire is 28%-40%, and the final forging temperature is ≥980°C.
3. The method according to claim 2, characterized in that Heat treatment includes solution treatment and aging.
4. The method according to claim 3, characterized in that Solid solution, including: Heat the forged GH6783 alloy to 1105~1120℃, keep it warm for a while, the holding time is 0.5~1min / mm, and then air cool it.
5. The method according to claim 3, characterized in that Time limit, including: First heat to 845℃, keep warm for 2h, cool to room temperature by air cooling, then heat to 720℃, keep warm for 8h, cool to 620℃ at a rate of 55℃ / h, keep warm for 8h, and air cool.
6. The method according to claim 1, characterized in that After the heat treatment, the method further comprises: The forgings were subjected to physical and chemical tests, and all performance indicators met the standards and the grain size met the requirements.
7. The method according to claim 1, characterized in that The inner hole of the hollow ring blank after forging is machined, including: Turn the inner hole, with a machining allowance of 3~5mm; The upper and lower end surfaces of the inner hole are chamfered, sandblasted and polished.
8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.