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Metal high cycle cryogenic treatment process and automatic cryogenic treatment system

A cryogenic treatment and processing system technology, applied in the field of materials, can solve the problems of inability to strengthen bar metal structural parts, difficulty in controlling material interface oxidation, poor room temperature deformation ability, etc., to achieve low cost, time saving, low energy consumption, and labor load small effect

Inactive Publication Date: 2020-06-09
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor room temperature deformability of magnesium alloys, the preparation of layered Mg / Al alloys by cumulative stacking usually needs to be carried out at high temperatures, and there are technically the following problems: (1) It is difficult to control the oxidation of the material interface; (2) High temperature tends to cause the grains to grow, and it is impossible to obtain nano-scale or sub-micron grains; (3) The process of accumulative stack rolling to prepare plates is relatively cumbersome, and stack-rolled plates need to be cut, polished, fixed, and heated multiple times. low production efficiency
However, this technology is only suitable for regularly shaped plates and cannot strengthen rods and complex metal structures

Method used

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  • Metal high cycle cryogenic treatment process and automatic cryogenic treatment system
  • Metal high cycle cryogenic treatment process and automatic cryogenic treatment system
  • Metal high cycle cryogenic treatment process and automatic cryogenic treatment system

Examples

Experimental program
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Effect test

Embodiment 1

[0049] (1) 6061 aluminum alloy was selected as the experimental material, and the aluminum alloy was subjected to solution treatment at 480°C for 2 hours in a vacuum tube furnace. pass figure 1 The bottom clamping end of the sample connecting rod 6 in the sample clamps the processed 6061 aluminum alloy sample firmly to ensure that the sample does not loosen during the subsequent cyclic cryogenic treatment.

[0050] (2) pass figure 1 The controller programmed by the software controls the movement of the horizontal stepping motor 3 on the horizontal guide rail 4, and moves the sample directly above the cryogenic box 11, and the moving speed of the horizontal stepping motor 3 is set to 0.2m / s Then control the movement of the longitudinal stepping motor 2 on the longitudinal guide rail, the moving speed of the longitudinal stepping motor 2 is set to 0.1m / s, and the whole sample is placed in the cryogenic treatment box to ensure that the cryogenic medium is completely immersed in ...

Embodiment 2

[0058] (1) Select 316L stainless steel as the experimental material, Figure 5 (a) is the metallographic diagram of the original 316L stainless steel sample before treatment. The structure is mainly uniformly distributed austenite, accompanied by a small amount of annealing twins, and the average grain size is about 30 μm. pass figure 1 The clamping end at the bottom of the sample connecting rod in the sample clamps the processed 316L stainless steel sample firmly to ensure that the sample does not loosen during the subsequent cyclic cryogenic treatment.

[0059] (2) pass figure 1 The software program of the computer control system in the computer controls the movement of the horizontal stepping motor on the horizontal guide rail, moves the sample to the top of the cryogenic box, and sets the moving speed of the horizontal stepping motor to 0.2m / s; then controls the vertical stepping Enter the movement of the motor on the longitudinal guide rail, set the moving speed of the ...

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Abstract

The invention belongs to the field of materials, and particularly relates to a metal high-cycle circulation cryogenic treatment process and an automatic cryogenic treatment system. The cryogenic treatment process sequentially comprises the steps of cryogenic treatment, water quenching treatment, alcohol cleaning treatment, and drying treatment, the above steps are repeated, and repeated circulation treatment is carried out; the treatment enables the interior of a metal sample to be subjected to microscopic plastic deformation, strain is accumulated through high-cycle circulation plastic deformation, and machining and hardening of the metal sample are achieved; and the treatment system comprises an execution mechanism, a treatment mechanism and a control system, wherein the treatment mechanism comprises a cryogenic treatment box, a water quenching treatment box, a cleaning box, a drying machine and a support. According to the processing system, a steel material is subjected to circulated repeated liquid nitrogen cryogenic medium and distilled water normal-temperature medium treatment, and original residual austenite is converted into a uniform and stable martensite structure by improving the supercooling degree; and the precipitation hardening phase in a crystal body becomes more uniform and finer after an aluminum alloy material is subjected to cryogenic treatment.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a metal high cycle cycle cryogenic treatment process and an automatic cryogenic treatment system. Background technique [0002] Large plastic deformation techniques (such as high-pressure torsion and equal-diameter angular extrusion deformation) can refine the grain structure of the material to the submicron or even nanometer level by applying multi-pass cumulative high strain to the metal material, thereby achieving fine-grain strengthening. The effect of materials is currently recognized by the international material science community as the most promising method for preparing bulk nano-metal materials. However, the size of the metal material sample obtained by this method is too small, the toughness is poor, and the requirements for equipment and molds are high. These shortcomings seriously hinder the wide application of large plastic deformation technology in the industrial field. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D6/04C21D1/63C21D9/00C22F1/04
CPCC21D1/18C21D1/63C21D6/04C21D9/0062C22F1/002C22F1/04
Inventor 赵永好魏康周浩刘亿陈雪飞肖礼容曹阳李玉胜聂金凤
Owner NANJING UNIV OF SCI & TECH
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