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Cavitation erosion-resistant laser high-entropy alloying powder on stainless steel surface and preparation process thereof

A high-entropy alloy and stainless steel technology, applied in metal material coating process, heating inorganic powder coating, coating, etc., can solve the problem that the coating forming quality and surface continuity are difficult to meet the use requirements, and it is difficult to obtain component coatings, etc. problems, achieve excellent anti-cavitation performance and reduce brittleness

Active Publication Date: 2015-04-29
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large differences in thermal physical properties such as density, melting point, specific heat and expansion coefficient between different types of metal elements in high-entropy alloy powders and between them and the base material, it is directly used in laser cladding, heat treatment and so on. Surface techniques such as spraying are difficult to obtain a coating with uniform composition, which makes it difficult for the forming quality and surface continuity of the coating to meet the production requirements

Method used

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  • Cavitation erosion-resistant laser high-entropy alloying powder on stainless steel surface and preparation process thereof
  • Cavitation erosion-resistant laser high-entropy alloying powder on stainless steel surface and preparation process thereof
  • Cavitation erosion-resistant laser high-entropy alloying powder on stainless steel surface and preparation process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Preparation of CoCrAlNi / 304 stainless steel laser high entropy alloying coating.

[0049] Co, Cr, Al, Ni alloy powders are prepared at a molar ratio of 1:1:1:1. The powders prepared from pure metal powders are ground and dried and placed on the surface of 304 stainless steel substrates. The thickness of the alloy powders is 0.5~ 0.8mm. Using CO 2 The laser performs single-pass and multi-pass laser irradiation. The specific process parameters are: output power 2kW, spot diameter 3mm, scanning speed 3-7mm / s, large-area laser beam scanning overlap rate of 50%, laser alloy The Ar gas flow rate of the protective gas during the melting process is 15L / min, and the thickness of the obtained laser alloying layer is 0.4-0.8mm.

Embodiment 2

[0051] CoCrAlNiB 0.1 / 304 stainless steel laser high entropy alloying coating preparation.

[0052] Co, Cr, Al, Ni, B alloy powders are prepared at a molar ratio of 1:1:1:1:0.1. The powders prepared from high-purity element powders are ground and dried and then placed on the surface of 304 stainless steel substrates. Alloy powder thickness 0.5 ~ 0.8mm. Using CO 2 The laser performs single-pass and multi-pass laser irradiation. The specific process parameters are: output power 2kW, spot diameter 3mm, scanning speed 3-7mm / s, large-area laser beam scanning overlap rate of 50%, laser alloy The Ar gas flow rate of the protective gas during the melting process is 15L / min, and the thickness of the obtained laser alloying layer is 0.4-0.8mm.

Embodiment 3

[0054] CoCrAlNiB 0.2 / 304 stainless steel high entropy alloy coating preparation.

[0055] Co, Cr, Al, Ni, B alloy powders were prepared at a molar ratio of 1:1:1:1:0.2, and the powders prepared from high-purity element powders were ground and dried and placed on the surface of 304 stainless steel substrates. Alloy powder thickness 0.5 ~ 0.8mm. Using CO 2 The laser performs single-pass and multi-pass laser irradiation. The specific process parameters are: output power 2kW, spot diameter 3mm, scanning speed 3-7mm / s, large-area laser beam scanning overlap rate of 50%, laser alloy The Ar gas flow rate of the protective gas during the melting process is 15L / min, and the thickness of the obtained laser alloying layer is 0.4-0.8mm.

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Abstract

The invention provides a cavitation erosion-resistant laser high-entropy alloying powder on a stainless steel surface and a preparation process thereof and belongs to the technical field of surface engineering. The component of the high-entropy alloying powder comprises four metal elements, namely Co, Cr, Al and Ni and a non-metal element B; the additive amounts of the metal elements in the powder are equal in molar ratio and the molar number of the non-metal element B is x times that of other component powder, wherein x is greater than or equal to 0 but less than or equal to 1. By adopting a proper laser radiation process parameter, a high-entropy alloy coating which is combined with a stainless steel base material and is uniform and fine in tissue, free of cracks and excellent in cavitation erosion resistance can be prepared by virtue of a surface alloying technology of laser reaction synthesis.

Description

Technical field: [0001] The invention relates to a powder and a process method for preparing a cavitation-resistant high-entropy alloy coating material on the surface of a stainless steel base material by using laser reaction synthesis technology, and belongs to the technical field of surface engineering. Background technique: [0002] As we all know, metal materials widely used until today, such as stainless steel (including steel), nickel-based alloys, cobalt-based alloys, titanium-based alloys, copper-based alloys, and palladium / platinum / gold-based alloys, etc., are named after their elements It is formed as a main element (generally more than 50%) as the base phase (body), supplemented by adding appropriate alloying elements, that is, the so-called single-element base alloy. [0003] The performance of this type of alloy can be considered from the performance of the main element matrix, and the alloying process is relatively simple and easy to adjust. However, the tradi...

Claims

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Application Information

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IPC IPC(8): C23C24/08B22F1/00C22C30/00
CPCB22F1/00C22C30/00C23C24/087
Inventor 张松伊俊振张春华吴臣亮李丹张文吉丁燕燕贾永峰张昊天
Owner SHENYANG POLYTECHNIC UNIV
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