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High-entropy alloy composite powder and method for strengthening magnesium alloy through ultrahigh-speed laser cladding

A high-entropy alloy and composite powder technology, which is applied in the coating process and coating of metal materials, can solve problems such as the influence of strength, hardness and wear resistance, and achieve cladding layer thickness, large powder consumption, and cladding dilution. low rate effect

Active Publication Date: 2020-11-27
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a high-entropy alloy composite powder to solve the problem that in the ultra-high-speed laser cladding technology, the molten magnesium alloy is mixed with the cladding powder to dilute the cladding powder to make its strength , hardness and wear resistance are affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 4

[0028] Clean the surface of the magnesium alloy substrate, wipe the magnesium alloy substrate with a steel brush, remove the surface scale, and obtain a rough surface, and then put the treated magnesium alloy substrate into an anhydrous ethanol solution for ultrasonic cleaning to remove surface dirt , take out to dry. The specific steps of ultra-high-speed laser cladding strengthening magnesium alloy are as follows:

[0029] (1) Set the process parameters of ultra-high-speed laser cladding: the laser power is 3.5kw, the spot diameter is 0.8mm, the cladding speed is 80 / min, and the multi-pass overlapping rate is 80%;

[0030] (2) Load the cladding powder on the ultra-high-speed laser cladding machine, and send the cladding powder to 0.2 mm above the surface of the magnesium alloy to be treated by means of synchronous powder feeding. Among them, the cladding powder is prepared according to Example 1. The metal powder and WC ceramic particles are weighed with a balance, and the ...

Embodiment 5

[0034] Clean the surface of the magnesium alloy substrate, wipe the magnesium alloy substrate with a steel brush, remove the surface scale, and obtain a rough surface, and then put the treated magnesium alloy substrate into an anhydrous ethanol solution for ultrasonic cleaning to remove surface dirt , take out to dry. The specific steps of ultra-high-speed laser cladding strengthening magnesium alloy are as follows:

[0035] (1) Set the process parameters of ultra-high-speed laser cladding: the laser power is 3.6kw, the spot diameter is 0.9mm, the cladding speed is 120m / min, and the multi-pass overlapping rate is 86%;

[0036](2) Load the cladding powder on the ultra-high-speed laser cladding machine, and send the cladding powder to 0.5mm above the surface of the magnesium alloy to be treated by means of synchronous powder feeding. Among them, the cladding powder was prepared according to Example 2. The metal powder and WC ceramic particles were weighed with a balance, and th...

Embodiment 6

[0040] Clean the surface of the magnesium alloy substrate, wipe the magnesium alloy substrate with a steel brush, remove the surface scale, and obtain a rough surface, and then put the treated magnesium alloy substrate into an anhydrous ethanol solution for ultrasonic cleaning to remove surface dirt , take out to dry. The specific steps of ultra-high-speed laser cladding strengthening magnesium alloy are as follows:

[0041] (1) Set the process parameters of ultra-high-speed laser cladding: the laser power is 3.8kw, the spot diameter is 0.8mm, the cladding speed is 90m / min, and the multi-pass overlapping rate is 90%;

[0042] (2) Load the cladding powder on the ultra-high-speed laser cladding machine, and send the cladding powder to 0.2 mm above the surface of the magnesium alloy to be treated by means of synchronous powder feeding. Among them, the cladding powder was prepared according to Example 3. The metal powder and WC ceramic particles were weighed with a balance, and t...

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Abstract

The invention discloses high-entropy alloy composite powder and a method for strengthening magnesium alloy through ultrahigh-speed laser cladding. The high-entropy alloy composite powder comprises nickel powder, chromium powder, cobalt powder, iron powder, copper powder, titanium powder, vanadium powder, aluminum powder and ceramic particles, and the mass fraction of the ceramic particles is 10-20% of that of the high-entropy alloy composite powder. The method for strengthening the magnesium alloy through laser cladding comprises the following steps of (1) setting the technological parametersof ultra-high speed laser cladding; (2) loading the high-entropy alloy composite powder on an ultra-high-speed laser cladding machine, so that the energy of a laser beam acts on the powder materials;and (3) feeding the powder materials to the position above the surface of the magnesium alloy to be treated in a synchronous powder feeding mode, melting the high-entropy alloy composite powder into liquid drops which drop into a molten pool on the surface of the magnesium alloy, and forming a cladding layer which is metallurgically combined with the magnesium alloy matrix after solidification. The high-entropy alloy composite powder and the method for strengthening the magnesium alloy through ultrahigh-speed laser cladding avoid over-melting or over-burning of the magnesium alloy, improve thesurface treatment efficiency of the magnesium alloy, and have the advantages of small deformation and high surface smoothness.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a high-entropy alloy composite powder and a method for superhigh-speed laser cladding strengthening magnesium alloy. Background technique [0002] Magnesium alloy is the lightest metal structure material with high specific strength, specific stiffness, excellent vibration resistance, impact resistance and cutting performance. At present, magnesium alloy has become an important material in the fields of transportation, electronic communication, national defense and military industry, and biomedicine, and has become the focus of attention of all countries in the world. However, magnesium is also the most negative metal among the practical metals, with a standard potential of -2.34V (relative to the standard hydrogen electrode). When the magnesium alloy contains some metal impurity elements (such as Fe, Ni, etc.), it is very easy to cause electrochemical corrosion; ...

Claims

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Application Information

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IPC IPC(8): C22C30/02C23C24/10B22F9/04C22F3/00
CPCB22F9/04B22F2009/043C22C30/02C22F3/00C23C24/103
Inventor 张昆涂坚黄灿张小彬黄墁王远刚周志明
Owner CHONGQING UNIV OF TECH
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