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A cavitation-resistant laser high-entropy alloying powder on stainless steel surface and its preparation process

A high-entropy alloy, stainless steel technology, applied in metal material coating process, heating inorganic powder coating, coating and other directions, can solve the problem of difficult to obtain component coating, coating forming quality and surface continuity is difficult to meet the requirements of use, etc. problem, to achieve excellent cavitation resistance and reduce brittleness

Active Publication Date: 2017-06-30
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A cavitation-resistant laser high-entropy alloying powder on stainless steel surface and its preparation process
  • A cavitation-resistant laser high-entropy alloying powder on stainless steel surface and its preparation process
  • A cavitation-resistant laser high-entropy alloying powder on stainless steel surface and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of CoCrAlNi / 304 stainless steel laser high entropy alloying coating.

[0054] 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

[0056] CoCrAlNiB 0.1 / 304 stainless steel laser high entropy alloying coating preparation.

[0057] 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

[0059] CoCrAlNiB 0.2 / 304 stainless steel high entropy alloy coating preparation.

[0060] 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-resistant laser high-entropy alloying powder on the surface of stainless steel and a preparation method thereof, belonging to the technical field of surface engineering. The powder composition for high-entropy alloying is composed of Co, Cr, Al, Ni four metal elements and non-metal element B; It is x times that of other component powders, where 0≤x≤1. Using appropriate laser irradiation process parameters, a high-entropy alloy coating with metallurgical bonding with stainless steel substrates, uniform and fine structure, no cracks, and excellent cavitation resistance can be prepared by laser reaction synthesis surface alloying technology.

Description

[0001] Technical field: [0002] 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. [0003] Background technique: [0004] 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. [0005] 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. How...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/08B22F1/00C22C30/00
CPCB22F1/00C22C30/00C23C24/087
Inventor 张松吴臣亮张春华伊俊振张昊天
Owner SHENYANG POLYTECHNIC UNIV
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