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Deep hypothermia forming method of electrolysis pure copper

A deep low temperature, pure copper technology, applied in the field of deep low temperature deformation of electrolytic pure copper, can solve the problems of high equipment requirements, high pressure, uneven grain refinement, etc., to improve deformation energy storage, reduce thermal activation, The effect of increasing strength

Inactive Publication Date: 2019-08-30
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional large deformation rolling and forging process of pure copper and its alloys, the pressure required is relatively high, the requirements for equipment are high, the grain refinement is uneven, and it is difficult to obtain high-performance larger bulk ultra-fine grains. Material

Method used

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  • Deep hypothermia forming method of electrolysis pure copper
  • Deep hypothermia forming method of electrolysis pure copper

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, the electrolytic pure copper was subjected to 4 passes of equal-diameter angular extrusion on a universal testing machine equipped with an environmental chamber. The extrusion speed was 10mm / min, the extrusion angle was 110°, and the temperature of the environmental chamber was -70°C; The pressed sample was soaked in a liquid nitrogen storage device and kept warm for 20 minutes; then it was taken out and subjected to 6 passes of cold rolling deformation on the rolling mill, and a liquid nitrogen injection device was installed on both sides of the rolling mill roll, and the sample was sprayed with liquid nitrogen during rolling. The rolling temperature of the sample is controlled at -40°C, the rolling speed is 200m / s, and the total deformation is 95%; the rolled sample is annealed at 400°C for 10 minutes to obtain a grain size of 500nm The uniform recrystallized structure of the microstructure is as follows figure 1 As shown, its hardness value is increased from 4...

Embodiment 2

[0022] Firstly, the electrolytic pure copper is subjected to equal-diameter angular extrusion for 3 passes on a universal testing machine equipped with an environmental chamber. The extrusion speed is 50mm / min, the extrusion angle is 100°, and the temperature of the environmental chamber is -50°C; The pressed sample was soaked in a liquid nitrogen storage device and kept warm for 20 minutes; then it was taken out on the rolling mill for 5 passes of cold rolling deformation, and a liquid nitrogen injection device was installed on both sides of the rolling mill roll, and the sample was sprayed with liquid nitrogen during rolling. The rolling temperature of the sample is controlled at -20°C, the rolling speed is 160m / s, and the total deformation is 85%; the rolled sample is annealed at 400°C for 30 minutes to obtain a grain size of 1μm The homogeneous recrystallized structure, its hardness value is increased from 40HV in the electrolytic state to 145HV.

Embodiment 3

[0024] Firstly, the electrolytic pure copper is subjected to 2 passes of equal-diameter angular extrusion on a universal testing machine equipped with an environmental chamber. The extrusion speed is 50mm / min, the extrusion angle is 120°, and the temperature of the environmental chamber is -30°C; The pressed sample was soaked in a liquid nitrogen storage device and kept warm for 20 minutes; then it was taken out on the rolling mill for 3 passes of cold rolling deformation, and a liquid nitrogen injection device was installed on both sides of the rolling mill roll, and the sample was sprayed with liquid nitrogen during rolling. The rolling temperature of the control sample is -10°C, the rolling speed is 100m / s, and the total deformation is 85%; the rolled sample is annealed at 400°C for 60 minutes to obtain a grain size of 20μm The uniform recrystallized structure of the microstructure is as follows figure 2 As shown, its hardness value is increased from 40HV in the electrolyt...

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Abstract

The invention discloses a deep hypothermia forming method of electrolysis pure copper. The deep hypothermia forming method comprises the following steps: at first, carrying out 2-4-pass equal-diameterangle extrusion on electrolysis pure copper on an all-purpose testing machine equipped with an environment box, then, soaking the extruded sample in liquid nitrogen for 20-30 minutes and taking the sample out, and sequentially carrying out multi-pass cold rolling deformation on the sample on a rolling mill and annealing treatment to obtain the copper sample, and the grain size of the copper sample is 500nm-20 microns. With adoption of the deep hypothermia forming method, uniform equiaxial recrystallized small crystalline grains can be obtained within short time to greatly improve the strengthof pure copper.

Description

technical field [0001] The invention belongs to the field of material preparation, and in particular relates to a deep-low temperature deformation method of electrolytic pure copper. Background technique [0002] Electrolytic pure copper has good electrical and thermal conductivity, and its malleability and ductility are also good. With the rapid development of various machinery industries, new requirements have been put forward for the comprehensive performance of pure copper components. For example, in addition to high strength, many key components also have high requirements for their toughness and other indicators. In the current research, the performance of pure copper is improved according to its own structure and performance characteristics. Within a certain range, the more uniform and finer the structure, the greater the strength of the material, and the plasticity will also be improved to a certain extent. In recent years, domestic and foreign countries have begun ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/08
CPCC22F1/08
Inventor 汪炳叔佟彤邓丽萍姚劲毅
Owner FUZHOU UNIV
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