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Tungsten-based alloy with grain size having gradient effect and preparation method of tungsten-based alloy

A technology of grain size and tungsten-based alloy, which is applied in the field of tungsten-based alloy and its preparation, can solve the problems of easy peeling, high melting point, and limited improvement methods, and achieve the effect of good surface processing layer, hardness and toughness

Active Publication Date: 2022-05-13
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, there are few studies on the surface strengthening of tungsten-based materials, and most of them focus on adding wear-resistant coatings to the materials. However, the bonding force of the coatings of sprayed or electroplated materials does not exceed 100MPa, and the thermal stress On the other hand, tungsten alloy has a high melting point, and there are few methods to obtain a high-hard surface layer through its own matrix deformation treatment, and the corresponding improvement methods are limited.

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  • Tungsten-based alloy with grain size having gradient effect and preparation method of tungsten-based alloy
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  • Tungsten-based alloy with grain size having gradient effect and preparation method of tungsten-based alloy

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Embodiment 1

[0039] An embodiment of the tungsten-based alloy having a gradient effect in grain size and its preparation method described in the present invention, the preparation method of the product comprises the following steps:

[0040] (1) Ball mill the high-purity tungsten powder with a particle size of 3-6 μm in an argon atmosphere protection environment, then sinter at 1800 ° C and 200 MPa and use a hot forging machine for thermal deformation treatment, the deformation amount reaches 80 %, the density reaches 99.3%;

[0041] (1-1) Perform annealing experiment on a small part of the substrate after thermal deformation in advance, and confirm that the annealing temperature when the hardness of the substrate decreases by 0.6GPa is 1450°C;

[0042] The first annealing treatment is performed when the temperature of the thermally deformed substrate is lowered to 1450°C, and the time is 2 hours;

[0043] (2) The rod material obtained after the first annealing treatment (the elongation a...

Embodiment 2

[0047] An embodiment of the tungsten-based alloy having a gradient effect in grain size and its preparation method described in the present invention, the preparation method of the product comprises the following steps:

[0048] (1) The high-purity tungsten-potassium powder with a particle size of 3-6 μm is uniformly ball-milled and mixed in an argon atmosphere protection environment, and then sintered at 2000 ° C and 150 MPa and subjected to thermal deformation treatment with a hot forging machine. The amount of deformation reaches 75%, and the density reaches 99.1%;

[0049] (1-1) Perform annealing experiment on a small part of the substrate after thermal deformation in advance, and confirm that the annealing temperature when the hardness of the substrate decreases by 0.4GPa is 1500°C;

[0050] The first annealing treatment is performed when the temperature of the thermally deformed substrate is lowered to 1500 ° C, and the time is 2.5 hours;

[0051] (2) The rod material o...

Embodiment 3

[0053] An embodiment of the tungsten-based alloy having a gradient effect in grain size and its preparation method described in the present invention, the preparation method of the product comprises the following steps:

[0054] (1) The high-purity tungsten-rhenium powder with a particle size of 3-6 μm is uniformly ball-milled and mixed in an argon atmosphere protection environment, and then sintered at 2200 ° C and 80 MPa and subjected to thermal deformation treatment with a hot forging machine. The amount of deformation reaches 78%, and the density reaches 99.3%;

[0055] (1-1) Perform annealing experiment on a small part of the substrate after thermal deformation in advance, and confirm that the annealing temperature when the hardness of the substrate decreases by 0.4GPa is 1520°C;

[0056] The first annealing treatment is performed when the temperature of the thermally deformed substrate is lowered to 1520°C, and the time is 5 hours;

[0057] (2) The rod material obtained...

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Abstract

The invention discloses a tungsten-based alloy with a grain size gradient effect and a preparation method of the tungsten-based alloy, and belongs to the field of alloy material preparation. The product is of a body-centered cubic structure, the grain size has a gradient effect, the depth range related to the gradient effect is 100-500 microns, the grain morphology from surface layer ultra-fine grains to internal coarse grains of the material is formed, and the characteristic structure that the grain size is uniformly and gradually transited to 50 microns from 0.5 microns is formed. The hardness value of the product is gradually transited to 3.5-4.5 GPa of the matrix from 4.5-6.5 GPa of the surface layer, the excellent wear resistance of the product is guaranteed, the interior of the product has certain toughness, the strength and plasticity during use are effectively considered, uneven strain caused by local plastic deformation is coordinated, and wear is inhibited. The invention further discloses a preparation method of the product, through special thermal deformation treatment, a grinding process and annealing treatment, the product has good processability, and meanwhile, no crack is generated.

Description

technical field [0001] The invention relates to the field of alloy material preparation, in particular to a tungsten-based alloy with a grain size gradient effect and a preparation method thereof. Background technique [0002] Friction Stir Welding (FSW) is a new type of solid phase joining technology. During the welding process, the nugget area does not melt, which can avoid the occurrence of coarse grain structure and ceramic particle strengthening phase (such as Y 2 o 3 、Al 2 o 3 ) and molten matrix delamination and other issues. Therefore, FSW has unique advantages in welding aluminum, magnesium low melting point materials, ultra-fine grain steel, particle dispersion strengthened steel and titanium alloy. However, the application of FSW in the connection of high melting point materials is limited. One of the main reasons is that the structure of the stirring head material is unstable and the function fails. As the core component of FSW, the stirring head needs to wo...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/04C22F1/18
CPCC22C27/04C22C1/045C22F1/18
Inventor 向鑫张鹏苗澍
Owner GUANGDONG UNIV OF TECH
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