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Preparation method of high-strength and high-toughness CrCoNi medium-entropy alloy homogeneous fine-grain thin plate

A high-strength, high-toughness, entropy alloy technology, applied in the field of preparation of high-strength, high-toughness CrCoNi medium-entropy alloy homogeneous fine-grained thin plate, can solve the influence of unpredictable uniformity and directionality of alloy material structure performance, uniformity and High strength, low anisotropy, and reduced anisotropy problems due to problems such as large influence of directionality and undisclosed free forging method

Active Publication Date: 2021-03-19
GUIZHOU AEROSPACE XINLI CASTINGSAND FORGINGS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patented technology is used to increase the ΣCSL grain boundary ratio of the entropy alloy in CoNiFe, and the strength is low; and the forging treatment after annealing has a great influence on the uniformity and directionality of the material's microstructure and properties, and the free forging method is not disclosed in this technical method As well as the effect, those skilled in the art cannot predict the influence of different free forging processes on the uniformity and directionality of the microstructure and properties of the alloy material
[0008] In addition, the above-mentioned patented technology needs further heat treatment to improve strength and toughness after rolling and forming, and the treatment process is relatively complicated.

Method used

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  • Preparation method of high-strength and high-toughness CrCoNi medium-entropy alloy homogeneous fine-grain thin plate
  • Preparation method of high-strength and high-toughness CrCoNi medium-entropy alloy homogeneous fine-grain thin plate
  • Preparation method of high-strength and high-toughness CrCoNi medium-entropy alloy homogeneous fine-grain thin plate

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Embodiment 1

[0027] A method for preparing a high-strength and high-toughness CrCoNi medium-entropy alloy homogeneous fine-grained thin plate, the specific steps are as follows:

[0028] (1) Vacuum smelting treatment: take Cr, Co, and Ni raw materials according to the atomic percentage of 25% Cr, 30% Co, and 45% Ni, and put them into vacuum smelting for smelting, the vacuum degree is 0.01-1Pa, and the smelting temperature is 1500-1700°C; Pouring the smelted molten metal into a mold at 300-600°C, cooling and molding to make an ingot;

[0029] (2) Annealing of alloy ingots: Heating the ingots at a controlled rate of 5°C / min to 1000°C, holding the heat for 1-5 hours, cooling with the furnace to below 180°C, and then air-cooling;

[0030] (3) Forging billet drawing length: the annealed ingot is subjected to upsetting and elongation forging to obtain a slab (size: 600mm×120mm×120mm); the initial forging temperature is 1150°C, and the final forging temperature is 1100°C , the thickening speed o...

Embodiment 2

[0033] A method for preparing a high-strength and high-toughness CrCoNi medium-entropy alloy homogeneous fine-grained thin plate, the specific steps are as follows:

[0034](1) Vacuum smelting treatment: take Cr, Co, and Ni raw materials according to the atomic percentage of 30% Cr, 35% Co, and 35% Ni, and put them into vacuum smelting for smelting, the vacuum degree is 0.01-1Pa, and the melting temperature is 1500-1700°C; Pouring the smelted molten metal into a mold at 300-600°C, cooling and molding to make an ingot;

[0035] (2) Annealing of alloy ingots: Heating the ingots at a controlled rate of 5°C / min to 1000°C, holding the heat for 1-5 hours, cooling with the furnace to below 180°C, and then air-cooling;

[0036] (3) Forging billet drawing length: the annealed ingot is subjected to upsetting and elongation forging to obtain a slab (size: 600mm×120mm×120mm); the initial forging temperature is 1150°C, and the final forging temperature is 1100°C , the roughing speed of bl...

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Abstract

The invention belongs to the technical field of metal materials, and particularly relates to a preparation method of a high-strength and high-toughness CrCoNi medium-entropy alloy homogeneous fine-grain thin plate. The preparation method comprises the five steps of vacuum smelting, alloy ingot annealing, hammer cogging and drawing-out and high-temperature back-and-forth rolling forming. Accordingto hammer cogging and drawing-out, upsetting and drawing-out forging treatment is carried out on an annealed alloy cast ingot to prepare a plate blank; and the upsetting rate is 50-200 mm / s, and the drawing-out forging ratio is 2-10. According to the method, hammer cogging and drawing-out treatment is carried out after annealing, a large number of dendrites in an as-cast structure can be completely broken through severe plastic deformation in a short time, a fine and uniform grain structure is obtained, and metallurgical defects such as pores and looseness are reduced; and a high-temperature back-and-forth rolling process method is adopted, the grain size and the structure are refined, the strength, plasticity and toughness of materials are improved, and the anisotropy problem of an CrCoNimedium-entropy alloy is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to a method for preparing a high-strength and high-toughness CrCoNi medium-entropy alloy homogeneous fine-grain thin plate. Background technique [0002] Compared with traditional metals, medium and high-entropy alloys have high entropy effect in thermodynamics, slow diffusion effect in kinetics, lattice distortion in structure, "cocktail" effect in performance, and high stability in structure, making The number of generated phases is much smaller than the maximum number determined by the Gibbs free energy phase law, and the high mixing entropy greatly improves the compatibility between the principal components, which can avoid the intermetallic compounds generated due to phase separation to the greatest extent. Single-phase solid solutions with simple phase structures such as FCC and BCC are formed. [0003] Medium and high-entropy alloys with FCC structure have high plast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/00C22C1/02C22C30/00
CPCC22F1/00C22C1/02C22C30/00
Inventor 王海军胡志同曹俊生张帅成桃王庆艳王家田王翔宇
Owner GUIZHOU AEROSPACE XINLI CASTINGSAND FORGINGS
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