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Laser surface heat treatment method for high-entropy alloy with reverse gradient nanostructure

A surface heat treatment and high-entropy alloy technology, which is applied in the field of high-entropy alloy preparation and processing, can solve the problems of enhancing the mutation-induced strengthening and work hardening effects of high-entropy alloys, and the inability to have both strength and plasticity of high-entropy alloys. Effects of thermal stress, enhanced mutation-induced strengthening and work hardening

Active Publication Date: 2022-01-21
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on the fact that the reverse gradient nanostructure can significantly enhance the mutation-induced strengthening and work hardening effects of high-entropy alloys in the process of plastic deformation, the present invention proposes a laser surface heat treatment method for reverse gradient nanostructure high-entropy alloys, and finally solves the problem of high-entropy alloys. The incompatibility of strength and plasticity in entropy alloys

Method used

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  • Laser surface heat treatment method for high-entropy alloy with reverse gradient nanostructure
  • Laser surface heat treatment method for high-entropy alloy with reverse gradient nanostructure
  • Laser surface heat treatment method for high-entropy alloy with reverse gradient nanostructure

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Embodiment 1

[0032] (1) Using pure metal with a purity ≥ 99.7wt.% as a raw material, a CoCrFeMnNi high-entropy alloy ingot was prepared by a vacuum induction melting process, and smelted repeatedly 5 times to ensure the uniformity of the chemical composition of the high-entropy alloy ingot;

[0033] (2) Heating the CoCrFeMnNi high-entropy alloy ingot to 1200°C and keeping it warm for 180min, then performing hot forging after being out of the furnace, the hot forging temperature is controlled at 1100°C, and the final forging thickness is controlled at 30mm;

[0034] (3) The high-entropy alloy forging blank needs to be annealed before cold rolling. The annealing temperature is 1000°C, the annealing time is 1h, and the annealing cooling method is water cooling;

[0035] (4) The high-entropy alloy forging billet after the annealing heat treatment is rolled at room temperature, the pass reduction is 0.3-2.5 mm, the total reduction rate is 88.3%, and the final rolling thickness is 3.5 mm;

[003...

Embodiment 2

[0039] (1) Using pure metal with a purity ≥ 99.7wt.% as a raw material, a CoCrFeMnNi high-entropy alloy ingot was prepared by a vacuum induction melting process, and smelted repeatedly 3 times to ensure the uniformity of the chemical composition of the high-entropy alloy ingot;

[0040] (2) Heat the CoCrFeMnNi high-entropy alloy ingot to 1250°C and keep it warm for 120min, then perform hot forging after it comes out of the furnace, the hot forging temperature is controlled at 1150°C, and the final forging thickness is controlled at 22mm;

[0041] (3) The high-entropy alloy forging billet needs to be annealed before cold rolling. The annealing temperature is 1000℃, the annealing time is 2h, and the annealing cooling method is water cooling;

[0042](4) The high-entropy alloy forging billet after the annealing heat treatment is rolled at room temperature, the pass reduction is 0.3-2.5mm, the total reduction rate is 86.4%, and the final rolling thickness is 3mm;

[0043] (5) Use ...

Embodiment 3

[0046] (1) Using pure metal with a purity ≥ 99.7wt.% as a raw material, a CoCrFeMnNi high-entropy alloy ingot was prepared by a vacuum induction melting process, and smelted repeatedly 4 times to ensure the uniformity of the chemical composition of the high-entropy alloy ingot;

[0047] (2) Heat the CoCrFeMnNi high-entropy alloy ingot to 1200°C and keep it warm for 240min, then perform hot forging after it comes out of the furnace, the hot forging temperature is controlled at 1100°C, and the final forging thickness is controlled at 27mm;

[0048] (3) The high-entropy alloy forging blank needs to be annealed before cold rolling. The annealing temperature is 900°C, the annealing time is 5 hours, and the annealing cooling method is water cooling;

[0049] (4) The high-entropy alloy forging billet after the annealing heat treatment is rolled at room temperature, the pass reduction is 0.3-2.5 mm, the total reduction rate is 88.3%, and the final rolling thickness is 4.5 mm;

[0050]...

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Abstract

The invention provides a laser surface heat treatment method for a high-entropy alloy with a reverse gradient nanostructure. The laser surface heat treatment method comprises the following steps that firstly, a high-entropy alloy cast ingot is prepared with pure metal as a raw material through a vacuum induction melting process, and melting is repeatedly conducted for 3-5 times, wherein the purity of the pure metal is larger than or equal to 99.7 wt.%; then, the high-entropy alloy cast ingot is subjected to hot forging, annealing and cold rolling, and a high-entropy alloy cold-rolled sheet with the thickness specification being 3-4.5 mm is obtained. and finally, a temperature control type semiconductor laser processing station is used for conducting laser surface heat treatment on the upper surface and the lower surface of the high-entropy alloy cold-rolled sheet, a gradient temperature field promotes surface crystal grains of the high-entropy alloy cold-rolled sheet to be coarsened, a large number of nanoscale crystal grains are still reserved in a core structure, and the high-entropy alloy with the reverse gradient nanostructure is formed. Due to the fact that the reverse gradient nanostructure remarkably enhances the mutation induction strengthening and work hardening effects, the prepared high-entropy alloy with the reverse gradient nanostructure has excellent strength and plasticity.

Description

technical field [0001] The invention belongs to the field of preparation and processing of high-entropy alloys, in particular to a cold-rolling-laser surface heat treatment method for reverse gradient nanostructure high-entropy alloys. Background technique [0002] High-entropy alloys are new materials based on the development of "chemical disorder". Alloys are designed from the perspective of mixing entropy or configuration entropy, which breaks through the limitations of traditional alloy material elements. High-entropy alloys have the potential to be significantly superior to conventional metal materials in terms of low-temperature fracture toughness, oxidation resistance, corrosion resistance, and radiation resistance, so they have broad applications in national strategic fields such as vehicles and energy power. Application prospect. It is worth noting that strong plasticity at room temperature is the basic mechanical property of high-entropy alloys as structural mater...

Claims

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Application Information

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IPC IPC(8): C22F1/16
CPCC22F1/16
Inventor 陈洁况威权王鹏飞曹宇
Owner WENZHOU UNIVERSITY
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