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CN-122012992-A - Nickel-based deformation superalloy and preparation method thereof

CN122012992ACN 122012992 ACN122012992 ACN 122012992ACN-122012992-A

Abstract

A nickel-based deformation superalloy and a preparation method thereof belong to the technical field of superalloy design and preparation. According to the invention, through optimizing component design, reasonably controlling Ti, al, nb, ta content and adding rare earth elements in a specific range, preparing an alloy cast ingot by adopting a vacuum induction and electroslag remelting process, cooling after carrying out specific multi-stage homogenization treatment on the cast ingot, carrying out diameter forging after alternately upsetting and drawing, and finally carrying out heat treatment to obtain the nickel-based wrought superalloy. The nickel-based wrought superalloy provided by the invention has uniform and fine grain structure, and has tensile strength of more than or equal to 1400MPa, yield strength of more than or equal to 1200MPa, tensile strength of more than or equal to 1000MPa at 800 ℃ and yield strength of more than or equal to 800MPa at room temperature.

Inventors

  • XIN XIN
  • LIU ENZE
  • JIA DAN
  • NING LIKUI
  • TAN ZHENG
  • TONG JIAN
  • LIU WEIHUA
  • LI HAIYING

Assignees

  • 中国科学院金属研究所

Dates

Publication Date
20260512
Application Date
20260213

Claims (7)

  1. 1. A nickel-based wrought superalloy is characterized by comprising the following chemical components in percentage by weight, wherein the balance of ：C：≤0.08wt%;Cr：9wt%~13wt%;Co：17wt%~21wt%;W：3wt%~5wt%;Mo：2wt%~4wt%;Al：2wt%~4wt%;Ti：2wt%~3.5wt%;Nb：1wt%~3wt%;Zr：0.01wt%~0.1wt%;B：≤0.04wt%;Ta：4wt%~6wt%,Hf：≤0.6wt%;Ce：≤0.01%; is Ni and unavoidable impurity elements.
  2. 2. The nickel-base wrought superalloy of claim 1, wherein the nickel-base wrought superalloy comprises, in weight percent, ：C：0.02wt%~0.07wt%;Cr：10wt%~12.5wt%;Co：17wt%~21wt%;W：3wt%~5wt%;Mo：2.5wt%~3.5wt%;Al：2.5wt%~3.5wt%;Ti：2.5wt%~3wt%;Nb：1.5wt%~2.5wt%;Zr：0.03wt%~0.06wt%;B：0.01wt%~0.02wt%;Ta：4.5wt%~5.5wt%,Hf：0.2wt%~0.4wt%;Ce：0.003wt%~0.010%; balance Ni and unavoidable impurity elements.
  3. 3. The nickel-base wrought superalloy according to claim 1 or 2, wherein the nickel-base wrought superalloy has a tensile strength of at least 1400MPa, a yield strength of at least 1200MPa, a tensile strength of at least 1000MPa at 800 ℃ and a yield strength of at least 800MPa at room temperature.
  4. 4. The method for producing a nickel-base wrought superalloy as in claim 1 or 2, comprising the steps of: S1, smelting an alloy ingot by adopting a vacuum induction and electroslag remelting method; S2, cooling to 1000 ℃ along with a furnace at a cooling speed of not higher than 10 ℃ per hour after multi-stage heat preservation homogenization treatment at 1130 ℃ to 1220 ℃, and then cooling to below 100 ℃ along with the furnace and discharging; S3, upsetting and cogging forging is carried out after heating and heat preservation at 1100-1150 ℃, and then radial forging is carried out after heating and heat preservation at 1100-1150 ℃; s4, heat treatment of the finished product.
  5. 5. The method for preparing the nickel-based wrought superalloy according to claim 4, wherein in S2, the multi-stage heat preservation homogenization treatment process comprises the steps of charging a cold furnace, heating along with the furnace, heating to 1130-1140 ℃ for 4-5 h, preserving heat for more than 15h, heating to 1200-1220 ℃ and preserving heat for more than 50h, cooling to 1000 ℃ at a cooling speed of not higher than 10 ℃ per hour, and discharging from the furnace along with furnace after cooling to below 100 ℃.
  6. 6. The method for preparing the nickel-based wrought superalloy according to claim 4, wherein in S3, upsetting and drawing are alternately performed, the first firing upsetting deformation is controlled to be 10% -20% by adopting a rapid forging machine, the second firing drawing is controlled to be 10% -20% by controlling the face reduction deformation, and then the deformation per firing is controlled to be 20% -50%.
  7. 7. The method for preparing the nickel-based wrought superalloy according to claim 4, wherein in S3, the radial forging process is that a radial forging machine is adopted for carrying out hot working to the size of a finished product by one fire, and the face reduction deformation is controlled to be 20% -50%.

Description

Nickel-based deformation superalloy and preparation method thereof Technical Field The invention relates to the technical field of superalloy design and preparation, and relates to a nickel-based wrought superalloy and a preparation method thereof, in particular to a nickel-based wrought superalloy with excellent high-temperature strength and good hot workability and a preparation method thereof. Background With the rapid development of the aerospace industry, higher requirements are put on the temperature bearing capacity of hot end components of an aero-engine, particularly key components such as turbine discs and blades. The alloys with relatively mature high temperature bearing capacity which are commercially used at present comprise GH4065A, GH and 4151, but the highest temperature bearing capacity can only reach 750 ℃, so that the requirements of the next-generation aero-engine on the working temperature of 800 ℃ and above are difficult to meet. The main problems existing in the prior art include: (1) The contradiction between strength and processability. In order to improve the high temperature strength, it is generally necessary to increase the content of γ' phase forming elements (Al, ti, etc.), but this leads to significant deterioration of the hot workability of the alloy. The high-content gamma' phase makes the alloy easy to generate crystal cracking in the hot working process, and engineering preparation is difficult. (2) Rare earth elements are limited in application. While attempts have been made in the prior art to improve superalloy performance by adding rare earth elements, these studies have focused primarily on single crystal or cast superalloys to enhance performance by purifying the alloy, strengthening grain boundaries, and improving oxidation resistance. However, in refractory superalloys, it is still a technical challenge to coordinate grain boundaries and intra-grain strength by rare earth elements while improving temperature bearing capacity and hot workability. Therefore, development of a novel nickel-based wrought superalloy is urgently needed, and the nickel-based wrought superalloy can improve the temperature bearing capacity to more than 800 ℃ and has good hot workability so as to meet the design requirements of an advanced aeroengine. Disclosure of Invention In order to solve the technical problems, the invention provides the nickel-based wrought superalloy and the preparation method thereof, and the nickel-based wrought superalloy has good hot workability while maintaining excellent high-temperature strength (800 ℃ and above) by optimizing component design, particularly reasonably controlling Ti, al, nb, ta content and adding rare earth elements in a specific range. In order to achieve the above purpose, the present invention adopts the following technical scheme: The first aspect of the invention provides a nickel-based wrought superalloy, comprising, in weight percent, ：C：≤0.08wt%;Cr：9wt%~13wt%;Co：17wt%~21wt%;W：3wt%~5wt%;Mo：2wt%~4wt%;Al：2wt%~4wt%;Ti：2wt%~3.5wt%;Nb：1wt%~3wt%;Zr：0.01wt%~0.1wt%;B：≤0.04wt%;Ta：4wt%~6wt%,Hf：≤0.6wt%;Ce：≤0.01%; balance Ni and unavoidable impurity elements. Preferably, the chemical components of the nickel-based wrought superalloy include ：C：0.02wt%~0.07wt%;Cr：10wt%~12.5wt%;Co：17wt%~21wt%;W：3wt%~5wt%;Mo：2.5wt%~3.5wt%;Al：2.5wt%~3.5wt%;Ti：2.5wt%~3wt%;Nb：1.5wt%~2.5wt%;Zr：0.03wt%~0.06wt%;B：0.01wt%~0.02wt%;Ta：4.5wt%~5.5wt%,Hf：0.2wt%~0.4wt%;Ce：0.003wt%~0.010%; balance Ni and unavoidable impurity elements. The high-temperature nickel-based alloy has the tensile strength of more than or equal to 1400MPa, the yield strength of more than or equal to 1200MPa, and the tensile strength of more than or equal to 1000MPa and the yield strength of more than or equal to 800MPa at 800 ℃ at room temperature. The second aspect of the invention provides a method for preparing the nickel-base wrought superalloy, comprising the following steps: (1) Smelting alloy ingots by adopting a vacuum induction and electroslag remelting method; (2) After 1130-1220 ℃ multi-stage heat preservation homogenization treatment, cooling to 1000 ℃ with a furnace at a cooling speed of not higher than 10 ℃ per hour, and then slowly cooling to below 100 ℃ with the furnace and discharging; (3) And (3) performing upsetting, drawing and cogging forging after heating and preserving at 1100-1150 ℃, and performing radial forging after heating and preserving at 1100-1150 ℃. (4) And (5) heat treatment of the finished product. As a preferable technical scheme: The multi-stage heat preservation homogenization treatment process in the step (2) comprises the steps of charging a cold furnace, heating along with the furnace, heating to 1130-1140 ℃ for 4-5 h, preserving heat for more than 15h, heating to 1200-1220 ℃ and preserving heat for more than 50h, cooling to 1000 ℃ at a cooling speed of not higher than 10 ℃ per hour, and discharging after cooling to below 100 ℃ along with the furnace. The upsetting, p