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CN-121976069-A - Forming process and application of GH4145 high-temperature alloy superfine crystal bar blank

CN121976069ACN 121976069 ACN121976069 ACN 121976069ACN-121976069-A

Abstract

The invention belongs to the technical field of high-temperature alloy preparation, and relates to a forming process and application of a GH4145 high-temperature alloy superfine crystal bar blank. The process adopts a duplex smelting process of vacuum induction smelting and vacuum consumable remelting to prepare a required cast ingot, the cast ingot subjected to high-temperature homogenization heat treatment is subjected to high-temperature small-deformation upsetting and moderate-temperature proper-deformation upsetting sequentially by multiple fires to form an intermediate billet with a good tissue state, the surface of the intermediate billet is coated with a heat-insulating coating before the finished product is charged by fires, and the forming of a target bar billet is finally completed by designing a step heating system and combining a radial forging process and a method of compensating temperature before forging. The process can effectively solve the technical problems of poor structure uniformity and overlarge core structure caused by temperature drop at the two ends and the surface layer of the bar blank, thereby obtaining uniform superfine crystal structure and having wide application value in actual industrial production.

Inventors

  • DU GANG
  • FU BAOQUAN
  • XU JIASHENG
  • Kang Mengke
  • SHI XINBO
  • LI SIJUN
  • WANG FAN
  • CAO GUOXIN
  • KAN ZHI
  • HE YONGSHENG

Assignees

  • 西安聚能高温合金材料科技有限公司

Dates

Publication Date
20260505
Application Date
20251230

Claims (10)

  1. 1. A forming process of a GH4145 superalloy superfine crystal rod blank is characterized by comprising the following steps of: step 1, preparing a required cast ingot by adopting a duplex smelting process of vacuum induction smelting and vacuum consumable remelting; Step 2, carrying out high-temperature homogenization heat treatment on the cast ingot to improve component segregation; Step 3, cogging and forging the ingot after the high-temperature homogenization heat treatment to obtain an intermediate billet with uniform structure; And 4, performing finished product fire forging on the intermediate blank to finish forming the target rod blank, wherein before charging, a heat-insulating coating is coated on the surface of the intermediate blank, charging is performed on cold materials, heating is performed by adopting a step heating system, and the radial forging process is combined through compensation temperature control before forging.
  2. 2. The forming process of the GH4145 superalloy superfine crystal rod blank according to claim 1, wherein the chemical composition percentage of the cast ingot is as follows, 0.03% -0.06%, 15.00% -16.00% of Cr, 2.25% -2.6% of Ti, 0.70% -1.20% of Nb+Ta, 0.40% -1.00% of Al, 5.00% -9.00% of Fe, and the balance of Ni and other trace elements.
  3. 3. The process for forming the GH4145 superalloy ultrafine crystal rod blank according to claim 1, wherein in the step 3, the cogging forging comprises forging an ingot subjected to homogenization heat treatment in a rapid forging machine by 4-5 times of fire at a temperature of Wen Kaipi, and forming an intermediate blank with uniform structure by adopting a continuous furnace returning mode and air cooling after forging.
  4. 4. The forming process of the GH4145 superalloy superfine crystal rod blank according to claim 3, wherein in step 3, the 4-5 fire high Wen Kaipi forging specifically comprises: The forging mode of the first 1-3 times is upsetting and pulling out in all directions, the end face of the cast ingot is subjected to mortise upsetting before upsetting, the flat end face is tapped after pulling out, the upsetting deformation is 15-30%, and the pulling out deformation is 10-40%; The forging mode of the later 1-2 times is eight-direction drawing, the drawing deformation is 15% -40%, the initial forging temperature is controlled to be not lower than 950 ℃, the final forging temperature is controlled to be not lower than 900 ℃, and the intermediate billet with the eight-direction section is obtained after each fire is ended.
  5. 5. The process for forming a GH4145 superalloy superfine crystal rod blank according to claim 3, wherein in step 3, a continuous furnace return mode is adopted specifically comprising: Heating the ingot subjected to the homogenization heat treatment, wherein the heating temperature of the first 2-3 fires is 1100-1120 ℃, charging the first fire cold material, charging the material into the furnace after the furnace temperature is reduced to below 500 ℃, heating to 1000 ℃, heating the material to a heat preservation coefficient of 0.6min/mm, heating to 1100-1120 ℃ at a heating speed of 2 ℃/min, and preserving heat for 4-5 h; the heating temperature of the back 1-2 fire is 1020-1040 ℃, the heat preservation coefficient of the continuous furnace return hot material is 0.2min/mm, and air cooling is performed after forging is completed.
  6. 6. The process for forming a GH4145 superalloy superfine crystal rod billet according to claim 1, wherein in step 4, the final product hot forging is specifically: The heat of the finished product is radial forging, the heat is common, 3-5 times of radial forging and drawing are carried out after the material is discharged from a furnace, the total deformation of drawing is 40% -70%, the drawing speed is 1.5m/min, the initial forging temperature is controlled to be not lower than 950 ℃, the final forging temperature is controlled to be not lower than 900 ℃, the bars are straightened after the drawing is finished, the required curvature is not more than 3mm/m, and the bars are air-cooled after straightening.
  7. 7. The process for forming a GH4145 superalloy superfine crystal rod blank according to claim 1, wherein in step 4, the step heating system is specifically as follows: The first step of step heating temperature is set to 820-850 ℃, the heat preservation coefficient is set to 1.0min/mm, the second step of step heating temperature is set to 1000-1020 ℃, the heat preservation coefficient is set to 0.5min/mm, then the temperature is quickly increased to 1040-1060 ℃, and the finished product is discharged from the furnace for forging after 20-30 min of heat preservation.
  8. 8. The process for forming a GH4145 superalloy superfine crystal rod billet according to claim 1, wherein in step 1, the weight of the ingot is 1.0-2.5 t.
  9. 9. The process for forming a GH4145 superalloy superfine crystal rod billet according to claim 1, wherein in step 4, the target rod billet has a specification of Φ150- Φ260mm.
  10. 10. Use of a GH4145 superalloy superfine crystal rod blank prepared by the shaping process according to any of claims 1 to 9 in the aeronautical, astronautical or nuclear fields.

Description

Forming process and application of GH4145 high-temperature alloy superfine crystal bar blank Technical Field The invention belongs to the technical field of high-temperature alloy preparation, relates to GH4145 high-temperature alloy, and particularly relates to a forming process and application of a GH4145 high-temperature alloy superfine crystal bar blank. Background The GH4145 alloy is a precipitation-strengthened Ni-Cr-based wrought superalloy, the strengthening phase of which is mainly gamma' -phase, accompanied by a small amount of eta phase, and has excellent comprehensive properties at 800 ℃ or below, including high strength, good corrosion resistance, oxidation resistance, creep resistance, and good forming and welding properties. However, the structure and properties of the alloy are extremely sensitive to hot working process parameters. In the actual forging process, mixed crystal structures are easy to form due to quicker heat dissipation at the two ends and the surface layer area of the bar blank, the mixed crystal structures are difficult to completely eliminate in the subsequent die forging, and meanwhile, the GH4145 alloy core structures are easy to grow up due to obvious temperature rise in the deformation process, so that the core grains of the bar are coarse and the structures are uneven. In view of this, the present invention has been made. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a forming process and application of a GH4145 high-temperature alloy superfine crystal bar blank, so as to solve the problems of temperature drop at two ends and surface layers of the bar blank and temperature rise at the core part of the bar blank, and further obtain uniform superfine crystal tissues. In order to achieve the above purpose, the present invention provides the following technical solutions: The forming process of the GH4145 superalloy superfine crystal rod blank specifically comprises the following steps: step 1, preparing a required cast ingot by adopting a duplex smelting process of vacuum induction smelting and vacuum consumable remelting; Step 2, carrying out high-temperature homogenization heat treatment on the cast ingot to improve component segregation; Step 3, cogging and forging the ingot after the high-temperature homogenization heat treatment to obtain an intermediate billet with uniform structure; And 4, performing finished product fire forging on the intermediate blank to finish forming the target rod blank, wherein before charging, a heat-insulating coating is coated on the surface of the intermediate blank, charging is performed on cold materials, heating is performed by adopting a step heating system, and the radial forging process is combined through compensation temperature control before forging. Specifically, the chemical composition percentage of the cast ingot is as follows, 0.03% -0.06%, 15.00% -16.00% of Cr, 2.25% -2.6% of Ti, 0.70% -1.20% of Nb+Ta, 0.40% -1.00% of Al, 5.00% -9.00% of Fe, and the balance of Ni and other trace elements. Specifically, in the step 3, cogging forging comprises the steps of forging an ingot subjected to homogenization heat treatment in a rapid forging machine by using a fire rate of 4-5 times of Wen Kaipi, and performing air cooling after forging by adopting a continuous furnace returning mode to form an intermediate billet with uniform structure. Further, in the step 3, the forging of the 4-5 fire-time high Wen Kaipi specifically includes: The forging mode of the first 1-3 times is upsetting and pulling out in all directions, the end face of the cast ingot is subjected to mortise upsetting before upsetting, the flat end face is tapped after pulling out, the upsetting deformation is 15-30%, and the pulling out deformation is 10-40%; The forging mode of the later 1-2 times is eight-direction drawing, the drawing deformation is 15% -40%, the initial forging temperature is controlled to be not lower than 950 ℃, the final forging temperature is controlled to be not lower than 900 ℃, and the intermediate billet with the eight-direction section is obtained after each fire is ended. Specifically, in step 3, the continuous furnace returning mode specifically includes: Heating the ingot subjected to the homogenization heat treatment, wherein the heating temperature of the first 2-3 fires is 1100-1120 ℃, charging the first fire cold material, charging the material into the furnace after the furnace temperature is reduced to below 500 ℃, heating to 1000 ℃, heating the material to a heat preservation coefficient of 0.6min/mm, heating to 1100-1120 ℃ at a heating speed of 2 ℃/min, and preserving heat for 4-5 h; the heating temperature of the back 1-2 fire is 1020-1040 ℃, the heat preservation coefficient of the continuous furnace return hot material is 0.2min/mm, and air cooling is performed after forging is completed. Specifically, in step 4, the final product hot forging specifically includes: The heat