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CN-117144208-B - Heat-resistant creep-resistant high-strength aluminum alloy material and preparation method and application thereof

CN117144208BCN 117144208 BCN117144208 BCN 117144208BCN-117144208-B

Abstract

The invention relates to a heat-resistant creep-resistant high-strength aluminum alloy material, a preparation method and application thereof, wherein the aluminum alloy material comprises ：Mg：0.60-0.72wt.％,Si：0.48-0.58wt.％,Fe≤0.20wt.％,V：0.01-0.10wt.％,B：0.01-0.08wt.％,Ca：0.02-0.10wt.％,Er：0.05-0.20wt.％,Y：0.04-0.15wt.％, percent of A1 and unavoidable impurities in percentage by mass. The preparation method comprises the steps of sequentially carrying out smelting, continuous casting and rolling, solution heat treatment, first cold drawing, first time-effect treatment, second cold drawing and second time-effect treatment on raw materials according to formula amounts to obtain the aluminum alloy material. The aluminum alloy material prepared by the invention has the advantages of heat resistance, creep resistance, high strength and high conductivity.

Inventors

  • ZHANG HAN
  • QIU PEIQUN
  • LAN SHUCAI
  • CHEN PEIXIN
  • YUAN SHIPENG
  • SHU JIAN
  • PENG XIANGYANG
  • ZHANG HUANQIANG
  • WANG XIAOFENG
  • LIN YULIANG
  • ZHUANG YINGXUAN
  • ZHU YUXI

Assignees

  • 广东电网有限责任公司
  • 广东电网有限责任公司潮州供电局
  • 广东电网有限责任公司电力科学研究院

Dates

Publication Date
20260505
Application Date
20230906

Claims (20)

  1. 1. An aluminum alloy material for a heat-resistant creep-resistant high-strength overhead conductor is characterized by comprising the following components in percentage by mass, wherein the balance of ：Mg：0.60-0.72wt.%,Si：0.48-0.58wt.%,Fe≤0.20wt.%,V：0.01-0.10wt.%,B：0.01-0.08wt.%,Ca：0.02-0.10wt.%,Er：0.05-0.20wt.%,Y：0.04-0.15wt.%, is Al and unavoidable impurities; wherein the total mass percentage of Er+Y in the aluminum alloy material is 0.15-0.35wt.%; the tensile strength of the aluminum alloy material is more than or equal to 325MPa; The steady-state creep rate of the aluminum alloy material is less than or equal to 1.85 multiplied by 10 -7 s -1 under the stress conditions of 175 ℃ and 30 MPa; the heat-resistant creep-resistant high-strength aluminum alloy material is prepared by the following method, which comprises the following steps: Sequentially carrying out smelting, continuous casting and rolling, solution heat treatment, first cold drawing, first time effect treatment, second cold drawing and second time effect treatment on raw materials according to formula amounts to obtain the aluminum alloy material; The deformation amount of each pass of the first cold drawing is 10-12%, the temperature of the first time-effect treatment is 185-195 ℃, the deformation amount of each pass of the second cold drawing is 10-12%, and the temperature of the second time-effect treatment is 195-205 ℃.
  2. 2. The aluminum alloy material as claimed in claim 1, wherein the mass percentage of V in the aluminum alloy material is 0.04-0.05wt.%.
  3. 3. The aluminum alloy material of claim 1 or 2, wherein the aluminum alloy material has an electrical conductivity of at least 54.1% iacs.
  4. 4. The aluminum alloy material of claim 1, wherein the aluminum alloy material has a heat resistant temperature of 175 ℃ at 400 h.
  5. 5. A method for producing an aluminum alloy material according to any one of claims 1 to 4, comprising: Sequentially carrying out smelting, continuous casting and rolling, solution heat treatment, first cold drawing, first time effect treatment, second cold drawing and second time effect treatment on raw materials according to formula amounts to obtain the aluminum alloy material; The deformation amount of each pass of the first cold drawing is 10-12%, the temperature of the first time-effect treatment is 185-195 ℃, the deformation amount of each pass of the second cold drawing is 10-12%, and the temperature of the second time-effect treatment is 195-205 ℃.
  6. 6. The method according to claim 5, wherein the pre-smelting further comprises preheating the raw materials.
  7. 7. The method according to claim 6, wherein the temperature of the preheating treatment is 150 to 250 ℃.
  8. 8. The method according to claim 6, wherein the preheating treatment is performed for 20 to 60 minutes.
  9. 9. The method according to claim 5, wherein the smelting comprises the steps of carrying out first smelting on an aluminum ingot, heating, adding a magnesium ingot and an Al-Si intermediate alloy for second smelting to obtain a first aluminum liquid, and then sequentially adding Al-Er, al-Y, al-B, al-Ca and an Al-V intermediate alloy into the first aluminum liquid for third smelting to obtain an aluminum alloy melt.
  10. 10. The method of claim 9, wherein the first smelting is at a temperature of 710-730 ℃.
  11. 11. The method according to claim 9, wherein the temperature after the temperature rise is 740 to 760 ℃.
  12. 12. The method of claim 9, wherein the second smelting is carried out for a holding time of 30-50 minutes.
  13. 13. The method of claim 9, wherein the third smelting is carried out for a holding time of 30-50 minutes.
  14. 14. The method of claim 9, wherein the post-smelting further comprises sequentially degassing, refining, and slagging-off.
  15. 15. The method according to claim 5, wherein the diameter of the aluminum alloy rod after continuous casting and rolling is 9-10mm.
  16. 16. The method according to claim 5, wherein the solution heat treatment is carried out at a temperature of 540 to 560 ℃.
  17. 17. The method according to claim 5, wherein the solution heat treatment is performed for a period of 1 to 2 hours.
  18. 18. The method according to claim 5, wherein the solution heat treatment is followed by water quenching.
  19. 19. The method of claim 5, wherein the first cold drawing comprises cold drawing to a diameter of 5-6mm in multiple passes.
  20. 20. The method of claim 5, wherein the first cold drawing has a drawing rate of 12-15m/s.

Description

Heat-resistant creep-resistant high-strength aluminum alloy material and preparation method and application thereof Technical Field The invention belongs to the technical field of aluminum alloy, and particularly relates to a heat-resistant creep-resistant high-strength aluminum alloy material, and a preparation method and application thereof. Background With the rapid development of economic construction, the power demand is increased year by year, so that the power transmission capacity is increased continuously, thereby leading to the increase of the service temperature of the overhead conductor, leading to the heated elongation and creep of the overhead conductor, and causing various problems. For example, wire sag increases substantially such that the wire-to-ground distance or distance to the crossing is not satisfactory for safety. Moreover, the territory of China is wide, and the high-voltage transmission line needs to pass through various areas, so that the overhead conductor is more required to have special performances of large span, large capacity, long distance and the like. At present, most of wires used in overhead transmission lines are still traditional steel-cored aluminum stranded wires, and the heat resistance and creep resistance of the wires are relatively weak, so that the service life of the wires is limited to a certain extent. Overhead conductors are also important as a medium for transporting power in transmission lines. Therefore, higher requirements are put on the performance of the aluminum alloy overhead conductor, and the aluminum alloy overhead conductor is required to have the performances of high strength, high conductivity, heat resistance, creep resistance and the like. CN112430765A discloses a high-conductivity heat-resistant creep-resistant aluminum alloy conductor material and a preparation method and application thereof, wherein the conductor material comprises, by mass, 0.02-0.10% of Zr, 0.04-0.12% of Cu, 0.02-0.06% of Ni, 0.05-0.15% of La, 0.005-0.020% of Y, and the balance of aluminum and unavoidable impurities. The preparation method comprises the steps of batching, smelting, casting, deforming and heat treatment. The prepared aluminum alloy conductor material has high conductivity and good heat resistance and creep resistance. But the heat treatment time for manufacturing the aluminum alloy wire is longer, the production efficiency is lower, and the strength of the wire is lower. Therefore, there is a need to develop a heat-resistant creep-resistant high-strength aluminum alloy material for use in the production of overhead conductors and the like, which is capable of heat-resistance and creep-resistance, while having high strength and high conductivity, and which is capable of reducing the cost as much as possible and improving the productivity. Disclosure of Invention In order to solve the technical problems, the invention provides the heat-resistant creep-resistant high-strength aluminum alloy material, the preparation method and the application thereof, and the prepared aluminum alloy material can resist heat and creep, simultaneously has high strength and high conductivity, and simultaneously achieves the purposes of reducing production cost and energy consumption and improving production efficiency through reasonable chemical composition design and matching with corresponding preparation processes. In order to achieve the technical effects, the invention adopts the following technical scheme: In a first aspect, the present invention provides a heat-resistant creep-resistant high-strength aluminum alloy material, which includes ：Mg：0.60-0.72wt.％,Si：0.48-0.58wt.％,Fe≤0.20wt.％,V：0.01-0.10wt.％,B：0.01-0.08wt.％,Ca：0.02-0.10wt.％,Er：0.05-0.20wt.％,Y：0.04-0.15wt.％, A1 and unavoidable impurities in balance in mass percent. According to the aluminum alloy material provided by the invention, B, ca and V elements are added into the high-strength Al-Mg-Si alloy to carry out multi-scale particle modification and microalloying element composite reinforcement, and meanwhile, a proper amount of rare earth elements are combined to cooperate, so that the hardness and strength of the aluminum alloy are improved, and meanwhile, the conductivity, the wear resistance, the corrosion resistance and the creep resistance are also greatly improved. In the invention, the total amount of the unavoidable impurities is less than or equal to 0.01%. In the present invention, the Mg content of the aluminum alloy material is 0.60-0.72wt.%, for example, 0.62wt.%, 0.64wt.%, 0.65wt.%, 0.66wt.%, 0.68wt.%, 0.70wt.%, or 0.71wt.%, etc., but not limited to the recited values, and other non-recited values in the numerical range are equally applicable. In the present invention, the weight percentage of Si in the aluminum alloy material is 0.48-0.58wt.%, for example, 0.49wt.%, 0.50wt.%, 0.52wt.%, 0.54wt.%, 0.55wt.%, 0.56wt.%, or 0.57wt.%, etc., but not limited to the recited values, other non-recited valu