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A laser surface heat treatment method for reverse gradient nanostructured high-entropy alloys

A technology of surface heat treatment and high-entropy alloy, which is applied in the field of high-entropy alloy preparation and processing, can solve the problems of high-entropy alloy strength and plasticity, enhance the deformation-induced strengthening and work hardening of high-entropy alloys, and achieve improved Mutation-induced strengthening and work hardening, and the effect of reducing thermal stress

Active Publication Date: 2022-07-22
WENZHOU UNIV
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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

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  • A laser surface heat treatment method for reverse gradient nanostructured high-entropy alloys
  • A laser surface heat treatment method for reverse gradient nanostructured high-entropy alloys
  • A laser surface heat treatment method for reverse gradient nanostructured high-entropy alloys

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Effect test

Embodiment 1

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

[0033] (2) The CoCrFeMnNi high-entropy alloy ingot is heated to 1200°C, and kept for 180 minutes, and hot forging is performed after being released from 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 billet needs to be annealed and heat-treated before cold rolling. The annealing and holding temperature is 1000 °C, the annealing and holding time is 1 h, and the annealing cooling method is water cooling;

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

Embodiment 2

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

[0040] (2) The CoCrFeMnNi high-entropy alloy ingot is heated to 1250°C and kept for 120min, and hot forging is performed after being released from 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 and heat-treated before cold rolling. The annealing and holding temperature is 1000 °C, the annealing and holding time is 2h, and the annealing cooling method is water cooling;

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

Embodiment 3

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

[0047] (2) The CoCrFeMnNi high-entropy alloy ingot was heated to 1200°C and kept for 240min, and hot forging was performed after being released from the furnace. The hot forging temperature was controlled at 1100°C, and the final forging thickness was controlled at 27mm;

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

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

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Abstract

The invention provides a laser surface heat treatment method for reverse gradient nanostructure high-entropy alloys, comprising the following steps: firstly, using pure metal with a purity of ≥99.7wt.% as raw materials, and adopting a vacuum induction melting process to prepare high-entropy alloy ingots , and repeated smelting 3 to 5 times. Then, hot forging, annealing and cold rolling are performed on the high-entropy alloy ingot to obtain a high-entropy alloy cold-rolled sheet with a thickness specification of 3 to 4.5 mm. Finally, laser surface heat treatment is performed on the upper and lower surfaces of the high-entropy alloy cold-rolled sheet by using a temperature-controlled semiconductor laser processing station. The gradient temperature field promotes the coarsening of the surface grains of the high-entropy alloy cold-rolled sheet, and a large amount of the core structure still remains. The nanoscale grains form reverse gradient nanostructured high-entropy alloys. Since the reverse gradient nanostructure significantly enhances the effect of mutation-induced strengthening and work hardening, the reverse gradient nanostructure high-entropy alloy prepared by the present invention has excellent strength and plasticity.

Description

technical field [0001] The invention belongs to the field of high-entropy alloy preparation and processing, in particular to a cold rolling-laser surface heat treatment method of reverse gradient nano-structure high-entropy alloy. Background technique [0002] High-entropy alloys are new materials developed based on "chemical disorder". The alloys are designed from the perspective of mixing entropy or configuration entropy, breaking through the limitations of traditional alloy materials. High-entropy alloys have potential properties that are significantly superior to conventional metal materials in low-temperature fracture toughness, oxidation resistance, corrosion resistance, and radiation resistance, so they have broad application prospects in the fields of vehicles, energy and power. . It is worth noting that room temperature strong plasticity is the basic mechanical property of high-entropy alloys as structural materials in special service environments. Gradient nanost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/16
CPCC22F1/16
Inventor 陈洁况威权王鹏飞曹宇
Owner WENZHOU UNIV
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