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CN-121992322-A - GH4698 thin rod tissue homogenization control method

CN121992322ACN 121992322 ACN121992322 ACN 121992322ACN-121992322-A

Abstract

The invention discloses a GH4698 thin rod structure homogenization control method, belongs to the technical field of alloy processing, and solves the problem of non-uniformity of grain structures of existing GH4698 alloy thin rods. The invention provides a GH4698 thin bar tissue homogenization control method which comprises the following steps of preparing an ingot, carrying out homogenization diffusion annealing treatment on the ingot, carrying out forging, cogging and rolling on the ingot obtained in the step 1 to obtain a bar blank, carrying out secondary homogenization treatment on the bar blank obtained in the step 2, and carrying out finish rolling treatment on the bar after the secondary homogenization treatment to obtain the GH4698 thin bar. The GH4698 alloy thin bar prepared by the control method has good uniformity of grain structure.

Inventors

  • LIU ZHEN
  • JU QUAN
  • SHEN YU
  • WANG TIANYI
  • ZHANG YAWEI

Assignees

  • 北京钢研高纳科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241108

Claims (10)

  1. 1. The GH4698 thin rod tissue homogenization control method is characterized by comprising the following steps of: step 1, preparing an ingot and carrying out homogenizing diffusion annealing treatment on the ingot; Step 2, forging, cogging and rolling the cast ingot obtained in the step 1 to obtain a bar blank; step 3, carrying out secondary homogenization treatment on the bar blank obtained in the step 2; and 4, carrying out finish rolling treatment on the bar after the secondary homogenization treatment to obtain the GH4698 alloy thin bar with uniform structure.
  2. 2. The method for homogenizing control of GH4698 fine bar structure according to claim 1, wherein in the step 4, the bar stock is rolled out from the furnace after the initial rolling size is phi 14-120mm and the temperature is kept sufficiently at 1070-1120 ℃, the final rolling size is phi 5-30mm, and the GH4698 fine bar is obtained after the air cooling is completed.
  3. 3. The GH4698 fine bar microstructure homogenizing control method of claim 2, wherein in step 4, multi-pass reversing continuous rolling is adopted for bar stock rolling.
  4. 4. The GH4698 thin bar microstructure homogenizing control method of claim 3, wherein in step 4, the multi-pass reversing continuous rolling is ten-pass reversing continuous rolling; the first pass, the rolling deformation is 5-20%, and the second pass rolling is immediately carried out after the rolling is finished; and (3) a second pass, namely rolling the bar by rotating the bar by 90 degrees on the basis of the first pass, wherein the rolling deformation is 5-20%, and immediately rolling for the third pass after the rolling is finished.
  5. 5. The method for homogenizing control of GH4698 thin bar tissue according to claim 4, wherein in the step 4, the third pass is performed by rotating the bar by 90 degrees on the basis of the second pass, the rolling deformation is 5-20%, and the fourth pass is performed immediately after the rolling is completed; And a fourth pass, wherein the bar is rolled by rotating 90 degrees on the basis of the third pass, the rolling deformation is 5-20%, and the fifth pass is immediately performed after the rolling is finished.
  6. 6. The method for homogenizing control of GH4698 thin rod tissue according to claim 5, wherein in the step 4, the fifth pass is performed by rotating the rod by 90 degrees on the basis of the fourth pass, the rolling deformation is 5-20%, and the sixth pass is performed immediately after the rolling is completed; And a sixth pass, rolling the bar by rotating 90 degrees on the basis of the fifth pass, wherein the rolling deformation is 5-20%, and immediately performing a seventh pass rolling after the rolling is finished.
  7. 7. The method for homogenizing control of a microstructure of a GH4698 fine bar according to claim 6, wherein in the step 4, the bar is rolled by rotating 90 ° on the basis of the sixth pass in the seventh pass, the rolling deformation is 5 to 20%, and the eighth pass is immediately performed after the rolling.
  8. 8. The method for homogenizing control of a microstructure of a GH4698 fine bar according to claim 7, wherein in the step 4, the bar is rolled by rotating 90 ° on the basis of the seventh pass in the eighth pass, the rolling deformation is 5 to 20%, and the ninth pass is immediately performed after the rolling.
  9. 9. The method for homogenizing control of a microstructure of a GH4698 fine bar according to claim 8, wherein in the step 4, the bar is rolled by rotating 90 ° on the basis of the eighth pass for the ninth pass, the rolling deformation is 5 to 20%, and the tenth pass is immediately performed after the rolling.
  10. 10. The method for homogenizing control of GH4698 fine bar structure according to claim 9, wherein in the step 4, the tenth pass is performed by rotating the bar by 90 ° on the basis of the ninth pass, the rolling deformation is 5-20%, and the bar is air-cooled after the rolling, so as to obtain the GH4698 fine bar with the diameter phi of 5-30 mm.

Description

GH4698 thin rod tissue homogenization control method Technical Field The invention relates to the technical field of alloy processing, in particular to a GH4698 thin rod tissue homogenization control method. Background GH4698 nickel-based superalloy has excellent high-temperature strength, creep strength and oxidation resistance under high-temperature and corrosive environments, and is widely applied to the fields of petrochemical industry, energy sources, automobiles and the like. The fine bar of GH4698 alloy is mainly used for producing various parts and structural members for aviation and spacecrafts, wherein most structural members are used in severe service environments of high temperature, steam corrosion and alternating load, so that the product quality requirements of aerospace manufacturing companies on the fine bar of GH4698 alloy are very strict, and besides the specific performance of the bar is required to meet the index requirements, the requirements on the structure of the fine bar are uniform in grain structure and have no large grains above 0 level. However, the GH4698 alloy thin bar produced in China at present often exposes the problems of uneven grain structure and partial 0-grade and 00-grade large grains, so that the purchasing requirements of domestic aerospace manufacturing companies are difficult to meet, the qualification rate of thin bar products supplied by metallurgical factories is low throughout the year, and only 40-50% of the thin bar products are wasted, and a large amount of manpower and material resources are caused. Therefore, the problem of non-uniformity of grain structures of the GH4698 alloy thin rod is solved, the problem that 0-grade and 00-grade large grains are urgent is eliminated, and the method has great significance for a supply chain and related industries of the alloy thin rod. Disclosure of Invention In view of the above analysis, the present invention aims to provide a method for controlling homogenization of a microstructure of a fine rod of GH4698, which is used for solving the problem of non-uniformity of the grain structure of the fine rod of the existing GH4698 alloy. The aim of the invention is mainly realized by the following technical scheme: the invention provides a GH4698 thin rod tissue homogenization control method, which comprises the following steps: step 1, preparing an ingot and carrying out homogenizing diffusion annealing treatment on the ingot; Step 2, forging, cogging and rolling the cast ingot obtained in the step 1 to obtain a bar blank; step 3, carrying out secondary homogenization treatment on the bar blank obtained in the step 2; and 4, carrying out finish rolling treatment on the bar subjected to the secondary homogenization treatment to obtain the GH4698 thin bar. Further, in the step 4, the initial rolling size of the bar stock is phi 14-120mm, the bar stock is discharged from a furnace for rolling after the bar stock is fully insulated at 1070-1120 ℃, the rolling final size is phi 5-30mm, and the bar stock is air cooled after rolling to obtain the GH4698 thin bar. Further, in step 4, multi-pass reversing continuous rolling is adopted when the bar stock is rolled. Further, in step 4, the multi-pass reversing continuous rolling is ten-pass reversing continuous rolling; the first pass, the rolling deformation is 5-20%, and the second pass rolling is immediately carried out after the rolling is finished; and (3) a second pass, namely rolling the bar by rotating the bar by 90 degrees on the basis of the first pass, wherein the rolling deformation is 5-20%, and immediately rolling for the third pass after the rolling is finished. Further, in the step 4, the bar is rotated by 90 degrees for rolling on the basis of the second pass in the third pass, the rolling deformation is 5-20%, and the fourth pass rolling is immediately carried out after the rolling is finished; And a fourth pass, wherein the bar is rolled by rotating 90 degrees on the basis of the third pass, the rolling deformation is 5-20%, and the fifth pass is immediately performed after the rolling is finished. Further, in the step 4, the bar is rotated for 90 degrees for rolling on the basis of the fourth pass in the fifth pass, the rolling deformation is 5-20%, and the sixth pass rolling is immediately carried out after the rolling is finished; And a sixth pass, rolling the bar by rotating 90 degrees on the basis of the fifth pass, wherein the rolling deformation is 5-20%, and immediately performing a seventh pass rolling after the rolling is finished. In step 4, the bar is rotated by 90 degrees for rolling on the basis of the sixth pass, the rolling deformation is 5-20%, and the eighth pass rolling is immediately performed after the rolling. In step 4, the bar is rotated by 90 degrees for rolling on the basis of the seventh pass, the rolling deformation is 5-20%, and the ninth pass rolling is immediately performed after the rolling. Further, in the step 4, the bar is rot