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CN-119530580-B - Preparation method of beryllium copper alloy material with high beryllium content

CN119530580BCN 119530580 BCN119530580 BCN 119530580BCN-119530580-B

Abstract

The invention provides a preparation method of a beryllium copper alloy material with high beryllium content, which comprises the steps of preparing a metal raw material containing pure copper and beryllium copper master alloy, smelting to obtain alloy liquid, casting the alloy liquid to obtain cast ingots, homogenizing the cast ingots to obtain homogenized cast blanks, hot rolling the homogenized cast blanks to obtain hot rolled blanks, annealing the hot rolled blanks to obtain annealed blanks, and carrying out a cyclic cold rolling-intermediate annealing process on the annealed blanks, and finally carrying out finish rolling and finished product annealing treatment on alloy strips to prepare the beryllium copper alloy material with high beryllium content.

Inventors

  • JIANG YANBIN
  • JIANG XIAOYU
  • LI ZHOU
  • XIAO ZHU
  • GONG SHEN
  • JIA YANLIN

Assignees

  • 中南大学

Dates

Publication Date
20260508
Application Date
20241209

Claims (9)

  1. 1. The preparation method of the beryllium copper alloy material with high beryllium content is characterized by comprising the steps of preparing a metal raw material containing pure copper and beryllium copper master alloy, smelting to obtain alloy liquid, casting the alloy liquid to obtain cast ingots, homogenizing the cast ingots to obtain homogenized cast blanks, hot rolling the homogenized cast blanks to obtain hot rolled blanks, annealing the hot rolled blanks to obtain annealed blanks, circularly cold rolling and intermediate annealing the annealed blanks to obtain alloy strips, and finally performing finish rolling and finished product annealing on the alloy strips to prepare the beryllium copper alloy material with high beryllium content; the temperature of the homogenization treatment is 800-820 ℃, and the time of the homogenization treatment is 10-12 hours; after the homogenization treatment is finished, naturally cooling the cast ingot to 650-700 ℃ in a heating furnace, and immediately cooling the cast ingot to below 40 ℃ through water cooling, wherein the water cooling rate is more than or equal to 80 ℃ per second; After the annealing treatment is finished, air cooling is carried out, wherein the speed is 0.5-5 ℃ per second; after the intermediate annealing is completed at any time, air cooling is carried out, wherein the air cooling rate is 0.5-5 ℃ per second; and after the annealing treatment of the finished product is finished, air cooling is carried out, wherein the air cooling rate is 0.5-5 ℃ per second.
  2. 2. The preparation method of the beryllium copper alloy material with high beryllium content, which is disclosed in claim 1, is characterized by comprising, by mass, 2.5-wt-4.0-wt% of Be, 0.00-wt-2.00-wt% of Mg, 0.00-wt-0.50-wt% of Al, and the balance of copper.
  3. 3. The method for preparing the beryllium copper alloy material with high beryllium content according to claim 1 or 2, which is characterized in that: the metal raw material also comprises copper-magnesium master alloy and pure aluminum; the purity of the pure copper is more than or equal to 99.99 percent; The beryllium copper master alloy contains 5.0-15.0wt% of beryllium; In the copper-magnesium master alloy, the content of magnesium is 10.0-20.0wt%; The purity of the pure aluminum is more than or equal to 99.99 percent; And casting the alloy liquid into a crystallizer for semi-continuous casting, and turning a wagon to obtain an ingot.
  4. 4. The method for preparing the beryllium copper alloy material with high beryllium content as set forth in claim 1, wherein the method comprises the following steps: Heating the homogenized casting blank to 750-780 ℃ and preserving heat for 30-60 min, and then carrying out hot rolling; heating the homogenized casting blank to 750-780 ℃ at a heating rate of more than or equal to 20 ℃ per second; the hot rolling process comprises the steps of carrying out reversing hot rolling for 4-6 times and then carrying out unidirectional hot rolling for 3-5 times, wherein the pass deformation of the reversing hot rolling is 28% -32%, and the pass deformation of the unidirectional hot rolling is 18% -22%; The reversing angle of the reversing hot rolling is 90 degrees.
  5. 5. The method for preparing the beryllium copper alloy material with high beryllium content according to claim 1 or 4, which is characterized in that: the temperature of the annealing treatment of the hot rolled blank is 750-780 ℃ and the heat preservation time is 30-40 min.
  6. 6. The method for preparing the beryllium copper alloy material with high beryllium content as set forth in claim 1, wherein the method comprises the following steps: in the process of circularly carrying out cold rolling and intermediate annealing on the annealing blank, carrying out 1 intermediate annealing for 3-5 times of cold rolling; In the process of carrying out cold rolling and intermediate annealing on the annealed blank in a circulating way, the deformation of 3-5 times of cold rolling is specifically 10% -12% in the 1 st pass, 18% -25% in the 2 nd pass and 30% -35% in the third pass and above.
  7. 7. The method for preparing the beryllium copper alloy material with high beryllium content according to claim 1 or 6, which is characterized in that: the cold rolling is carried out until the size of the finished product material is 0.05-0.08 mm above; the temperature of the intermediate annealing is 750-780 ℃ and the heat preservation time is 30-40 min.
  8. 8. The method for preparing the beryllium copper alloy material with high beryllium content according to claim 1 or 2, which is characterized in that: Finish rolling for 1-3 times, wherein the pass deformation is 10% -15%; The temperature of the finished product annealing treatment is 750-780 ℃ and the heat preservation time is 10-15 min.
  9. 9. The method for preparing the beryllium copper alloy material with high beryllium content according to claim 1 or 2, which is characterized in that: The beryllium copper alloy material with high beryllium content is selected from one of a plate strip, a tube bar and a wire rod.

Description

Preparation method of beryllium copper alloy material with high beryllium content Technical Field The invention belongs to the technical field of copper alloy, and particularly relates to a preparation method of a beryllium copper alloy material with high beryllium content. Background The beryllium copper alloy has excellent performances of high strength, high elasticity, high conductivity, fatigue resistance, non-ignition and the like, and is a key material of high-end electronic components in the industries of aerospace, computers, automobiles and the like. According to the difference of beryllium content, the beryllium copper alloy can be generally divided into two main types, one type is high-beryllium copper alloy, namely high-strength beryllium copper alloy, the beryllium content is 1.6 wt% -2.1 wt%, the other type is low-beryllium copper alloy, namely high-conductivity beryllium copper alloy, the beryllium content is generally less than 0.7 wt%, and in the actual production process, the beryllium content in the low-beryllium copper alloy is generally controlled to be about 0.4 wt%. Nowadays, the beryllium content of high beryllium copper alloys has been raised to above 2.5 wt% for obtaining more excellent secondary electron emission performance. However, when the Be content exceeds 2.3 wt percent, hard and brittle beta/gamma phases are generated in the alloy, stress concentration is caused, so that the material is cracked when deformed, the forming processing of the beryllium copper alloy strip is not facilitated, the application of the beryllium copper alloy in various electronic components is limited, the quantity of the beta/gamma phases is obviously increased along with the increase of the Be content, and the tendency of alloy processing cracking is larger. The heat treatment process is an important means for regulating the size, shape and distribution of the second phase, wherein the heat treatment termination temperature and cooling rate are key parameters for phase transformation and precipitation of the high beryllium copper alloy. In addition, the beryllium copper alloy has higher work hardening rate due to the existence of the second phase, and the pass work rate and the total number of processing passes obviously influence the production efficiency and the yield. The Chinese patent CN202110121201.7 adopts a two-stage heat treatment method to obtain the alpha+beta phase beryllium copper alloy, however, the primary heat treatment temperature of the method is higher than the peritectic reaction temperature 863 ℃ of the total beryllium copper, so that an overburning structure is easy to form, and the alloy performance is reduced. In addition, the cooling mode of the method from the secondary heat treatment temperature to room temperature is not strictly required, and if the cooling rate is too slow, the phase transformation and precipitation behavior of the second phase also occur in the alloy, so that the processing performance of the workpiece is reduced. The Chinese patent CN202311557142.3 adopts semi-continuous casting to obtain a beryllium copper alloy ingot, and prepares a beryllium copper alloy strip with the beryllium content as high as 2.5 wt% -5.0 wt% through multi-pass rolling and intermediate annealing. However, the cooling mode after heat treatment in the method is water cooling, so that the quenching stress of the workpiece is increased, the subsequent forming processing is not facilitated, and a blocky beta phase exists in the alloy, so that stress concentration is easily formed at a second phase during processing, the workpiece is cracked, and the yield of the method is low. Meanwhile, the method does not strictly control the rolling deformation, the strip is easy to generate lateral bending, wrinkling and the like, the number of finish rolling passes is large, the manufacturing cost is improved, and the production efficiency is low. Therefore, the method for preparing the beryllium copper alloy strip with low cost, high production efficiency, high yield and high beryllium content, which has stable second phase component, is developed and has important significance for engineering application of the material. Disclosure of Invention The invention aims to solve the problems of uneven and inconsistent second phase components, cracking, side bending and wrinkling of a strip and multiple processing passes in the prepared beryllium copper strip caused by imperfect heat treatment process and rolling pass design in the existing method, and provides a preparation method of a beryllium copper alloy strip with high beryllium content. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention relates to a preparation method of a beryllium copper alloy material with high beryllium content, which comprises the steps of preparing a metal raw material containing pure copper and a beryllium copper master alloy, smelting to obtain an alloy