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Multi-stage combination deformation heat treatment method for ultrahigh-strength CuNiSn-series elastic copper alloy

An elastic copper alloy, deformation heat treatment technology, applied in the preparation of high-end conductive elastic materials, multi-stage combined deformation heat treatment preparation of ultra-high strength CuNiSn elastic copper alloy, can solve the problem of increased sediment, alloy corrosion resistance, strength and plasticity Reduction and other problems, to achieve the effect of reducing reverse segregation, reducing reverse segregation phenomenon, and refining the as-cast structure

Active Publication Date: 2018-05-22
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of the alloy is regulated by controlling the amount of cold rolling, aging temperature and time, but in the deformation heat treatment, in order to obtain higher electrical conductivity, the aging time must be prolonged or the aging temperature must be increased, which will lead to the inconsistency of the grain boundary α+γ The continuous precipitation increases, which reduces the corrosion resistance, strength and plasticity of the alloy

Method used

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  • Multi-stage combination deformation heat treatment method for ultrahigh-strength CuNiSn-series elastic copper alloy
  • Multi-stage combination deformation heat treatment method for ultrahigh-strength CuNiSn-series elastic copper alloy
  • Multi-stage combination deformation heat treatment method for ultrahigh-strength CuNiSn-series elastic copper alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A. Casting

[0027] Put the specified electrolytic copper and nickel into the heating furnace to melt, and the surface of the melt is covered with a protective atmosphere to prevent oxidation. The melting temperature is 1300°C-1500°C. After it is completely melted, lower the furnace temperature to 1250°C-1270°C , Sn, copper-magnesium master alloy, copper-cerium master alloy, nickel-boron master alloy, copper-strontium master alloy, copper-vanadium are added respectively, so that the composition range is (mass percentage), Ni: 15.0%; Sn : 8.0%; Mn: 0.5%; Mg: 0.15%; B: 0.03%, Ce: 0.1%; Sr: 0.1%; -1250℃ for casting;

[0028] B. Homogenization

[0029] Remove the surface defects of the ingot obtained in step A, and conduct a homogenization treatment at 830° C. for 5 hours in a protective furnace containing an anti-oxidation protective atmosphere; then homogenize for 5 hours in a protective furnace with an anti-oxidation protective atmosphere at 870° C.

[0030] C. Hot roll...

Embodiment 2

[0051] A. Casting

[0052] Put the specified electrolytic copper and nickel into the heating furnace to melt, and the surface of the melt is covered with a protective atmosphere to prevent oxidation. The melting temperature is 1300°C-1500°C. After it is completely melted, lower the furnace temperature to 1250°C-1270°C , Sn, copper-magnesium master alloy, copper-cerium master alloy, nickel-boron master alloy, copper-strontium master alloy, copper-vanadium are added respectively, so that the composition range is (mass percentage), Ni: 15.0%; Sn : 8.0%; Mn: 0.5%; Mg: 0.15%, B: 0.07%; Ce: 0.1%; -1250℃ for casting;

[0053] B. Homogenization

[0054] Remove the surface defects of the ingot obtained in step A, and conduct a homogenization treatment at 830° C. for 5 hours in a protective furnace containing an anti-oxidation protective atmosphere; then homogenize for 5 hours in a protective furnace with an anti-oxidation protective atmosphere at 870° C.

[0055] C. Hot rolling

[...

Embodiment 3

[0074] A. Casting

[0075] Put the specified electrolytic copper and nickel into the heating furnace to melt, and the surface of the melt is covered with a protective atmosphere to prevent oxidation. The melting temperature is 1300°C-1500°C. After it is completely melted, lower the furnace temperature to 1250°C-1270°C , Sn, copper-magnesium master alloy, copper-cerium master alloy, nickel-boron master alloy, copper-strontium master alloy, copper-vanadium are added respectively, so that the composition range is (mass percentage), Ni: 20.0%; Sn : 5.0%; Mn: 0.5%; Mg: 0.15%, B: 0.03%; Ce: 0.1%; -1250℃ for casting;

[0076] B. Homogenization

[0077] Remove the surface defects of the ingot obtained in step A, and conduct a homogenization treatment at 830° C. for 5 hours in a protective furnace containing an anti-oxidation protective atmosphere; then homogenize for 5 hours in a protective furnace with an anti-oxidation protective atmosphere at 870° C.

[0078] C. Hot rolled

[0...

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Abstract

The invention discloses a multi-stage combination deformation heat treatment preparation method for an ultrahigh-strength CuNiSn-series elastic copper alloy. The method comprises the steps that a casting is subjected to two-stage homogenization treatment, hot rolling, solid solution, pre-aging, first-time cold rolling, first-time aging, second-time cold rolling and second-time aging sequentially,wherein pre-aging has the technological parameters that the temperature is 350-380 DEG C and the time lasts for 30-60 minutes. According to the multi-stage combination deformation heat treatment technology for the alloy, the condition that cellular precipitation occurs in the alloy aging process can be effectively avoided, distribution of a precipitated phase of the CuNiSn-series alloy is controlled, the corrosion resistance and the abrasion resistance are significantly improved, and the electric conductivity and the strength and ductility product (the product of the strength and the ductility) can be increased. The CuNiSn-series elastic copper alloy prepared through the heat treatment technology has the characteristics of the ultrahigh strength, the high stress relaxation resistance and the like, is high in safety and reliability and can meet the requirements of the spaceflight industry, the aviation industry, the navigation industry and the electronic industry on a high-performance conductive elastic material.

Description

technical field [0001] The invention relates to a method for preparing an ultra-high-strength CuNiSn-based elastic copper alloy, in particular to a method for preparing an ultra-high-strength CuNiSn-based elastic copper alloy by multi-stage combined deformation heat treatment. It is mainly used in the preparation of high-end conductive elastic materials required by industries such as aerospace, aviation, navigation and electronics. Background technique [0002] With the development of industries such as aviation, aerospace, ships, weapons and electronics, higher requirements are put forward for the performance of elastic copper alloy materials. High reliability, long service life, high load, high environmental adaptability and green environmental protection have become the main directions of elastic copper alloy materials. The most typical elastic copper alloy in the field of high-end elastic copper alloy is Cu-Be alloy. They have high strength, high elasticity, high hardn...

Claims

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Application Information

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IPC IPC(8): C22C9/06C22F1/08C22C1/03
Inventor 李周周科朝姜业欣肖柱龚深甘雪萍张县委
Owner CENT SOUTH UNIV
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