A preparation method of surface gradient alloy steel material based on bionic structure

A technology of alloy steel and surface layer, which is applied in the direction of metal material coating process, coating, heating inorganic powder coating, etc., can solve the problems of low gradient layer and single form of gradient alloy elements, etc., and achieve uniform gradient, good strength and toughness, The effect of production safety

Active Publication Date: 2017-12-08
NANJING INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: the present invention provides a method for preparing a surface-layer gradient alloy steel material based on a bionic structure to solve the problems in the prior art that the gradient layer of the gradient alloy steel material obtained by severe surface deformation is low and the gradient alloy elements exist in a single form

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  • A preparation method of surface gradient alloy steel material based on bionic structure
  • A preparation method of surface gradient alloy steel material based on bionic structure
  • A preparation method of surface gradient alloy steel material based on bionic structure

Examples

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Embodiment 1

[0025] The surface of a 20g boiler steel plate with a thickness of 10mm is gradually finely ground with No. 50 SiC sandpaper to No. 10 SiC sandpaper, polished, etched with dilute nitric acid, and finally rinsed with alcohol and dried. Wire-cut the surface-treated steel plate into 20mm×20mm×10mm samples, put the samples in a vacuum heat treatment furnace at 350°C for 20 minutes, and quickly take out the samples and place them in a fixed sample mold to fix them. 3.5N pure Cr powder with a particle size of 75µm (200 mesh), using an impact device to continuously impact the surface of the sample, the radius of curvature of the impact end is 2mm, the impact time is 15min, the impact energy is 1.5J, and the impact rate is 50 times per second. Continuous impact at the same position, that is, the moving speed of the impact end is 2s, and Cr powder is added in time during the impact process. After the impact is completed, remove the residual Cr powder, clean the impact surface with alco...

Embodiment 2

[0027] The surface of the Cu30Ni alloy plate with a thickness of 15mm was gradually finely ground with No. 50 SiC sandpaper to No. 10 SiC sandpaper, polished, etched with dilute hydrochloric acid, and finally rinsed with alcohol and dried. Wire-cut the surface-treated Cu30Ni alloy plate into 20mm×20mm×15mm samples, put the samples in a vacuum heat treatment furnace at 200°C for 10 minutes, and quickly take out the samples and place them in a fixed sample mold to fix them. Use the impact device to continuously impact the surface of the sample. The radius of curvature of the impact end is 1mm, the impact time is 5min, the impact energy is 1J, and the impact rate is 20 times / s. Put it into a vacuum annealing furnace at 400°C for 12 hours, take it out after cooling with the furnace, and then clean it with alcohol. Atomic force microscope observation and hardness test were carried out on the samples prepared above at different depths from the outermost surface. The results are as f...

Embodiment 3

[0029]The surface of the 09MnNb alloy plate with a thickness of 15mm was gradually finely ground with No. 50 SiC sandpaper to No. 10 SiC sandpaper, polished, etched with dilute nitric acid, and finally rinsed with alcohol and dried. Wire-cut the surface-treated 09MnNb alloy plate into 20mm×20mm×15mm samples, put the samples into a vacuum heat treatment furnace at 400°C to preheat for 30 minutes, quickly take out the samples and place them in a fixed sample mold for fixation, The surface is covered with a uniform mixture of 3.5N pure Cr, Ni, Ti, Mo, and V powders with a particle size of 75 µm (200 meshes) (the mass ratio of Cr, Ni, Ti, Mo, and V powders is 20:10:1:1:1), using The impact device continuously impacts the surface of the sample. The radius of curvature of the impact end is 4mm, the impact time is 30min, the impact energy is 3J, and the impact rate is 80 times / s. Continuous impact at the same position means that the impact end moving speed is 5s. Add Cr, Ni, Ti, Mo, ...

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Abstract

The invention discloses a preparing method for a surface layer gradient alloy steel material based on a bionic structure. The preparing method comprises the steps of surface pretreatment, preheating treatment, large stress-strain fierce impact deformation treatment and restoring treatment. A large stress-strain fierce impact deformation method is adopted, proper technological parameters are selected, a micro-nano gradient microscopic structure is formed on the surface layer of the alloy steel material, the crystal grain dimension, the carbide content, the solid solubility and the alloy element content gradually change from the most surface layer to the core, transition is consecutive, the gradient is uniform, no obvious interface layer exists, and the defects of cracking, stripping and the like are also avoided. The thickness of the gradient layer is not smaller than 300 micrometers, the alloying degree and the solid solubility degree in the gradient layer are high, and the gradient layer shows good toughness, abrasion resistance, corrosion resistance, heat resistance and oxidation resistance. Large stress-strain impact deformation equipment can be operated in a handheld manner, automatic operation can be carried out with the combination of automatic equipment, and the dimension of metal samples is not limited. The preparing method is simple in process, safe in production and low in cost.

Description

technical field [0001] The invention belongs to the technical field of metal material surfaces, in particular to a method for preparing a surface gradient alloy steel material based on a bionic structure. Background technique [0002] Due to long-term evolution, natural biomaterials have formed fine structures and excellent properties that adapt to the environment, which provides a natural idea for the preparation and surface modification of materials, among which biomimetic gradient materials have attracted widespread attention all over the world. Different from other bionic materials, the structure or composition of gradient materials changes gradually. For example, wood is a natural composite gradient material. From the perspective of radial structure, the length of tracheids and wood fibers gradually increases from the pith to the bark. Wood The density and fibrous structure also gradually increase, with obvious gradient characteristics. Wood has multi-level microstructu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/08
CPCC23C24/087
Inventor 毛向阳王红星王章忠赵秀明陈浩杨红艳姚瑶王嘉慧
Owner NANJING INST OF TECH
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