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Method for promoting intracrystalline distribution of fine particles in laser shock melting and injecting process

A laser shock and fine particle technology, which is applied in the coating process and coating of metal materials, can solve the problems of insufficient modification of fine particles and large distribution ratio, so as to promote the distribution ratio in the crystal and increase the fluidity. , The method is simple and easy to implement

Active Publication Date: 2020-08-04
JIANGSU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the fine particle modification effect is not fully exerted due to the relatively large distribution of fine particles on the grain boundary in the laser shock melt injection fine particle modification layer, and to invent a method to promote the fine particle modification in the laser shock melt injection process. Method of Realizing Intragranular Distribution of Particles

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  • Method for promoting intracrystalline distribution of fine particles in laser shock melting and injecting process
  • Method for promoting intracrystalline distribution of fine particles in laser shock melting and injecting process

Examples

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example 1

[0025] Example 1: The material to be modified is TC11 titanium alloy, the binder is NaCl, and the fine particles are WC particles with an average particle size of 1 μm. First, apply NaCl saturated solution on the surface of TC11 and dry it. The thickness of the insulation layer is 40 μm, and the porosity of the insulation layer is about 55%. Then, the mixed slurry of NaCl and WC is coated and dried, and the thickness of the preset layer is is 400 μm.

[0026] The coated samples were preheated using an induction coil heating unit. During heating, use an infrared thermometer to measure the side temperature of the sample, and stop heating immediately when the temperature reaches 300°C. The heating temperature is about 6s. After the heating is completed, quickly put the sample into a specific fixture and cover the coated quartz glass. This process is controlled within 10s.

[0027] The preheated samples were processed by laser shock melt injection using a continuous fiber laser...

example 2

[0031] Example 2: The material to be modified is TC11 titanium alloy, the binder is NaCl, and the fine particles are WC particles with an average particle size of 1 μm. First, apply NaCl saturated solution on the surface of TC11 and dry it. The thickness of the heat insulation layer is 30 μm, and the porosity of the heat insulation layer is about 50%. Then, the mixed slurry of NaCl and WC is applied and dried, and the thickness of the preset layer is is 500 μm.

[0032] The coated samples were preheated using an induction coil heating unit. During heating, use an infrared thermometer to measure the side temperature of the sample, and stop heating immediately when the temperature reaches 200°C. The heating temperature is about 5s. After the heating is completed, quickly put the sample into the specific fixture and cover the coated quartz glass. This process is controlled within 8s.

[0033] The preheated samples were processed by laser shock melt injection using a continuous...

example 3

[0035] Example 3: The material to be modified is TC11 titanium alloy, the binder is NaCl, and the fine particles are WC particles with an average particle size of 0.5 μm. First, apply NaCl saturated solution on the surface of TC11 and dry it. The thickness of the insulation layer is 50 μm, and the porosity of the insulation layer is about 60%. Then, the mixed slurry of NaCl and WC is applied and dried, and the thickness of the preset layer is is 300 μm.

[0036] The coated samples were preheated using an induction coil heating unit. During heating, use an infrared thermometer to measure the side temperature of the sample, and stop heating immediately when the temperature reaches 350°C. The heating temperature is about 8s. After the heating is completed, quickly put the sample into a specific fixture and cover the coated quartz glass. This process is controlled within 9s.

[0037] The preheated samples were processed by laser shock melt injection using a continuous fiber las...

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Abstract

A method for promoting intracrystalline distribution of fine particles in the laser shock melting and injecting process controls the ratio of the temperature of the fine particles injected into a melting pool to the temperature of the melting pool in the laser shock melting and injecting process by coating a to-be-modified material with a thermal insulation layer, performing preheating, using negative defocusing technological parameters and the like, thereby promoting the intracrystalline distribution of the fine particles in the laser shock melting and injecting process, meanwhile promoting the formation of a laser shock effect and improving the injection rate of the fine particles, and the method has the advantage of being easy to implement.

Description

technical field [0001] The invention belongs to the technical field of laser surface treatment, and relates to the technology of laser shock melting injection of fine particles, in particular to a method for promoting the realization of intracrystalline distribution of fine particles in the process of laser shock melting injection. Background technique [0002] Laser shock melt injection fine particle technology (Chinese patent 201710713879.8) is a new laser surface treatment technology that can realize the modification of fine particles. The core idea of ​​this technology is to coat the surface of the material to be modified with a light-transmitting preset layer containing fine particles, and cover the light-transmitting preset layer with a constrained layer. When the laser beam irradiates the preset layer, a part of The laser will heat the substrate through the constrained layer and the preset layer to form a molten pool on the surface of the substrate, and a part of the ...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/10
Inventor 许增王宏宇翟许强晁栓孙永毅
Owner JIANGSU UNIV
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