Accelerated aging treatment method for metal plate strip

A technology for metal strips and treatment methods, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of incomparable aging treatment performance, poor performance, low peak current density of pulse current, etc., achieve excellent comprehensive mechanical properties, improve The effect of high strength and conductivity

Pending Publication Date: 2021-07-16
CHINALCO MATERIALS APPL RES INST CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although pulse current aging treatment has also been reported in the literature, the peak current density of pulse current is low, the treatment time is long, and the performance after aging treatment is poor. In addition, the core parameter RMS current value is not mentioned
For example, using pulse current to treat solid solution Cu-3.2Ni-0.75Si, when pulse frequency is 1kHz, pulse duration tp=120μs, pulse current density j=1.34×10 4 A / cm 2 , The total aging time is 500s, the electrical conductivity of the alloy after aging is 33.6%IACS, and the microhardness is 245HV. These aging effects cannot be compared with the performance of conventional aging treatment

Method used

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  • Accelerated aging treatment method for metal plate strip
  • Accelerated aging treatment method for metal plate strip
  • Accelerated aging treatment method for metal plate strip

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The hot-rolled C7025 copper alloy with a thickness of 14mm is cold-rolled to 0.25mm, and the pulse current treatment is performed by the device shown in the figure. The pulse width is 80μs, the treatment frequency is 600Hz, and the peak current density is 640A / mm 2 , the root mean square current density is 80A / mm 2, The passing time of the positive and negative electrodes is 15s, and 1-2nm Ni is obtained in the tissue after pulse current treatment. 2 Si precipitated phase, the strength and electrical conductivity of the obtained metal plate and strip have been improved, and its tensile strength reaches 750MPa, hardness 240HV 0.2 , The elongation rate is 10%, and the conductivity is 46% IACS.

[0039] Microstructure of Cu-Ni-Si before and after pulse current aging, see image 3 As shown, a large number of precipitated phases appeared after pulse current treatment. Compared with the traditional aging treatment of C7025 at 450℃ for 4h, the tensile strength of this mater...

Embodiment 2

[0041] The hot-rolled C7025 copper alloy with a thickness of 14mm is cold-rolled to 2.8mm by 80% reduction, and pulse aging treatment is carried out by the device shown in the figure. The pulse current frequency is 600Hz, the pulse width is 80μs, and the peak current density is 800A / mm 2 , the RMS current density is 120A / mm 2, After treatment for 15s, it will be 91% cold-rolled to 0.25mm, which is the second cold-rolling. At the same time, the pulse current treatment is performed by the device as shown in the figure, that is, the second pulse current aging. The processing frequency is 600Hz, and the peak current density is 640A / mm 2 , the root mean square current density is 80A / mm 2 , processing 15s. There are 1~2nmNi in the tissue after the pulse current treatment 2 Si precipitated phase, its strength and electrical conductivity are improved, the tensile strength of the treated material reaches 821MPa, and the hardness is 253HV 0.2 , The elongation is 9%, and the conduct...

Embodiment 3

[0043] The 7075 aluminum alloy with a cold rolling deformation rate of 90% after solid solution is treated with pulse current. The specific treatment parameters and corresponding performance are shown in the table below. The optimal treatment parameters are: pulse frequency 200Hz, pulse width 80μs, peak current density is 42A / mm 2 , the RMS current density is 4.1A / mm 2 , aging treatment for 15s, the 5nm quasi-stable η′ phase exists in the treated sample structure, and the hardness of the obtained material reaches 197HV 0.2 , the hardness value is equivalent to the traditional aging method, that is, aging at 120°C for 48h.

[0044]

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Abstract

The invention provides an accelerated aging treatment method for a metal plate strip. The method comprises the following steps of: conducting pulse current to the metal plate strip through a roller type positive electrode and a roller type negative electrode, and the like, so as to realize the aging treatment of the pulse current on metal. According to the method, the used current frequency is 50-1000 Hz, the peak current is 1000-500 KA, and the pulse width is smaller than 100 microseconds. According to the pulse current aging treatment provided by the invention, diffusion of solute atoms is accelerated, nucleation and growth of a second phase are accelerated, the aging process is shortened, and the comprehensive performance of the metal plate strip is improved.

Description

technical field [0001] The invention relates to a processing method for metal plates and strips, in particular to an accelerated aging treatment method for metal plates and strips. Background technique: [0002] For age-strengthening alloys, especially for the aging heat treatment and heat preservation of metal plates and strips for a long time, it will undoubtedly increase the production cost of metal materials. Especially for alloys such as C7025 copper alloy, it generally needs to undergo two aging treatments to produce Ni with a size of 2nm. 2 For the Si precipitated phase, the single aging holding time is 4 to 8 hours, and the heating and cooling times are longer, up to 6 hours or more respectively, in order to obtain an alloy with a tensile strength of 600 MPa and an electrical conductivity of 40% IACS or more Material ("High Performance Copper Alloy and Its Processing Technology" [M]. Liu Ping, Zhao Dongmei, Tian Baohong. Metallurgical Industry Press, 2005.). As a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C21D1/04
CPCC21D9/52C21D1/04
Inventor 祝儒飞娄花芬刘宇宁王虎莫永达王云鹏白依可
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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