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Copious cooling asymmetrical rolling method for preparing entropy alloy foil in high-performance CrCoNi

A technology of asynchronous rolling and entropy alloying, used in metal rolling, metal rolling, rolls, etc., can solve the problem of no way to achieve, and achieve the effect of improving strength and toughness

Active Publication Date: 2018-11-30
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is necessary to further reduce the thickness of the medium-entropy alloy and prepare the medium-entropy alloy foil for micro-formed parts, there is almost no way to achieve it by using the traditional rolling method.

Method used

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  • Copious cooling asymmetrical rolling method for preparing entropy alloy foil in high-performance CrCoNi
  • Copious cooling asymmetrical rolling method for preparing entropy alloy foil in high-performance CrCoNi

Examples

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application example 1

[0030] The 150 μm thick medium entropy alloy CrCoNi foil is prepared by cryogenic asynchronous rolling, and the steps are as follows:

[0031] The first step: using cast CrCoNi alloy rods as raw materials.

[0032] Step 2: cutting the CrCoNi alloy rod into thin sheets by wire cutting, the thickness of the sheet is 1.0 mm.

[0033] Step 3: Put the flakes into a cryogenic box for cryogenic treatment. The holding time is 10 minutes, and the temperature of the cryogenic box is set at -190°C.

[0034] Step 4: Turn on the liquid nitrogen spray guns on the left and right sides to cool the roll.

[0035] Step 5: Take out the cryogenically cooled CrCoNi alloy sample and perform cryogenic asynchronous rolling. During the asynchronous rolling process, keep liquid nitrogen to cool the rolls. The rolling speed is 6m / min, and the rolling differential speed ratio is set to 1.6. The single pass reduction rate is 10%. The roll is made of high-speed steel material.

[0036] Step 6: Put the...

application example 2

[0038] The 20 μm thick medium entropy alloy CrCoNi foil is prepared by cryogenic asynchronous rolling, and the steps are as follows:

[0039] The first step: using cast CrCoNi alloy plate as raw material.

[0040] Step 2: cutting the CrCoNi alloy sheet into thin slices by wire cutting, the thickness of the sheet is 0.3 mm.

[0041] Step 3: Put the flakes into a cryogenic box for cryogenic treatment. The holding time is 10 minutes, and the temperature of the cryogenic box is set at -150°C.

[0042] Step 4: Turn on the liquid nitrogen spray guns on the left and right sides to cool the roll.

[0043] Step 5: Take out the cryogenically cooled CrCoNi alloy sample and perform cryogenic asynchronous rolling. During the asynchronous rolling process, keep liquid nitrogen to cool the rolls. The rolling speed is 18m / min, and the rolling differential speed ratio is set to 1.4. The single pass reduction rate is 8%. The roll is made of high-speed steel material.

[0044] Step 6: Put th...

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Abstract

A copious cooling asymmetrical rolling method for preparing an entropy alloy foil in high-performance CrCoNi comprises the following steps: cutting a CrCoNi alloy bar or plate into sheets; carrying out copious cooling treatment in a copious cooling box at the temperature of minus 190 DEG C to minus 150 DEG C; cooling rolls by using a liquid nitrogen spray gun; carrying out copious cooling asymmetrical rolling on samples after copious cooling; maintaining liquid nitrogen in an asymmetrical rolling process to cool the rolls; cooling the rolled materials in the copious cooling box; and repeatingthe fourth step and the fifth step until the reduction rate of rolled pieces exceeds 85%-95% and the thickness of the foil is 200 mu m-6 mu m. CrCoNi alloy has good plastic deformation capacity underthe condition of ultra-low temperature, dynamic recrystallization behavior of the grain size of a material in a large plastic deformation process is inhibited by ultra-low temperature to reduce the grain size, the thickness of the material is reduced by twisting rolling deformation in a rolled piece deformation region in the asymmetrical rolling process, thus, entropy CrCoNi alloy foil is produced, the strength and plasticity of the material are improved effectively, and thus, the prepared medium-entropy CrCoNi foil has high toughness.

Description

technical field [0001] The invention belongs to the technical field of metal plate and strip rolling, and in particular relates to a cryogenic asynchronous rolling method for preparing high-performance CrCoNi medium-entropy alloy foil. Background technique [0002] The development and needs of the aerospace industry have promoted the progress of material science research, and the application of advanced materials has promoted the progress of the aerospace industry. At present, tasks related to satellite technology, manned spaceflight technology and lunar exploration are becoming more and more frequent. High reliability, long life and lightweight are the focus of future spacecraft design and manufacturing. CrCoNi medium entropy alloys have high strength at low temperatures, good toughness, structural stability over a wide temperature range, resistance to radiation damage and resistance to alternating temperatures, etc., and have the potential to be used in active components o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/40B21B3/00B21B27/10B21B45/02
Inventor 喻海良刘峙麟甘斌
Owner CENT SOUTH UNIV
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