Low-cost and long-service-life surface layer gradient material with stainless steel performance and preparing method of low-cost and long-service-life surface layer gradient material

A gradient material, stainless steel technology, applied in metal material coating process, coating, heating inorganic powder coating, etc., can solve the problems of high cost of stainless steel, shallow alloying depth, low alloying degree, etc., and achieve the production cost The effect of reducing, high alloying depth, alloying degree and alloying depth

Active Publication Date: 2016-03-09
南京首勤特种材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the objectives of the invention: the present invention provides a low-cost and long-life surface gradient material with stainless steel properties to solve the problem of high cost of stainless steel in the prior art
[0006] Another object of the present invention: the present invention provides a method for preparing a low-cost and long-life surface gradient material with stainless steel properties, so as to solve the above-mentioned technical problems of low alloying degree and shallow alloying depth induced by severe plastic deformation on the surface

Method used

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  • Low-cost and long-service-life surface layer gradient material with stainless steel performance and preparing method of low-cost and long-service-life surface layer gradient material
  • Low-cost and long-service-life surface layer gradient material with stainless steel performance and preparing method of low-cost and long-service-life surface layer gradient material
  • Low-cost and long-service-life surface layer gradient material with stainless steel performance and preparing method of low-cost and long-service-life surface layer gradient material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]The surface of the low-carbon steel 10# steel plate with a thickness of 10mm is gradually finely ground to No. 10 SiC sandpaper with No. 50 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 300°C for 15 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 75 μm (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 1.7J, and the impact rate is 50 times / second. The continuous impact time 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 ...

Embodiment 2

[0037] 30# steel (medium carbon steel) with a thickness of 10 mm is selected as the base material, and the pretreatment process is the same as that in Example 1. Put the sample into a vacuum heat treatment furnace for preheating at 200°C for 30 minutes, then take it out and place it in a fixed sample mold, and then cover the surface with a uniform mixture of 3.5N pure Cr powder and Ti powder with a particle size of 75 μm (200 mesh) (Cr powder The mass ratio to Ti powder is 20:1), and the impact device is used to continuously impact the surface of the sample. The impact parameters are: 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 / second , the continuous impact time at the same position, that is, the moving speed of the impact end is 1s, and the mixture of Cr powder and Ti powder is added in time during the impact process. After the impact is completed, remove the remaining Cr and Ti powders, ...

Embodiment 3

[0039] The industrial pure iron with a thickness of 10 mm is selected as the base material, and the pretreatment process is the same as that in Example 1. Put the sample into a vacuum heat treatment furnace to preheat at 400°C for 10 minutes, then take it out and place it in a fixed sample mold, and then cover the surface with a uniform mixture of 3.5N pure Cr powder, Ni powder and Mo powder with a particle size of 75 μm (200 mesh). (The mass ratio of Cr, Ni and Mo powder is 20:10:1), the impact device is used to continuously impact 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 / second, the continuous impact time at the same position, that is, the moving speed of the impact end is 5s, and the mixed powder of Cr, Ni, and Mo is added in time during the impact process. After the impact is completed, remove the residual Cr, Ni, and Mo mixed powder, clean the impacted ...

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Abstract

The invention discloses a low-cost and long-service-life surface layer gradient material with stainless steel performance. The surface layer gradient material comprises a surface layer gradient structure with stainless steel performance. The grain size of the surface layer gradient structure is gradually increased from the surface to the core part to be the same as the grain size of a base body. The solid solubility and the carbide content of the surface layer gradient structure are gradually reduced from the surface to the core part. The solid solubility and the carbide content of the surface layer gradient structure are gradually reduced from the surface to the core part. An ideal micro-nano gradient structure is formed through the surface pretreatment, preset metal powder, large stress-strain impact deformation treatment and returning treatment, the alloying degree and the alloying depth of the surface layer gradient material are obviously improved, no obvious interface exists between the gradient layer and the base body, and transition is continuous. The technology is simple, production is safe, and cost is low. 80-85% of material surface layer alloy elements are converted into a solid solution, 15-20% of material surface layer alloy elements are converted into carbide, and the alloying depth is larger than 300 microns. The corrosion resistance of the material is obviously improved, the service life of the material is obviously prolonged, and the corrosion resistance and the service life of the surface layer gradient material are equivalent to the stainless steel performance.

Description

technical field [0001] The invention belongs to the technical field of metal material surface strengthening and modification, and in particular relates to a low-cost, long-life surface gradient material with stainless steel properties and a preparation method thereof. Background technique [0002] Due to its excellent comprehensive properties such as corrosion resistance, processing performance, heat resistance and mechanical properties, stainless steel is widely used in household appliances, sanitary ware, food hygiene, decoration, construction, transportation and other places in people's lives, and has gradually become a measure of a country. One of the main indicators of people's quality of life. For example, in developed countries such as Europe and the United States, stainless steel used in white goods and utensils accounts for more than 40% of the total consumption of stainless steel. However, stainless steel contains a large amount of alloying elements such as Cr and N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08
CPCC23C24/087
Inventor 毛向阳王章忠赵秀明王红星姚瑶陈浩杨红艳李嘉宝
Owner 南京首勤特种材料有限公司
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