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Method for strengthening ferroalloy surface through laser melt injection

A technology of laser melting and ferroalloying, which is applied in the coating process of metal materials, coating, etc., can solve the problems of unclear process parameters and high technical difficulty, so as to ensure the strengthening effect, ensure the superheat of the molten pool, and good wear resistance Effect

Active Publication Date: 2021-03-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing laser melting technology usually uses general functional ceramics, and there are problems such as high technical difficulty and unclear process parameters in the process of applying cBN ceramics to laser melting technology.

Method used

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  • Method for strengthening ferroalloy surface through laser melt injection
  • Method for strengthening ferroalloy surface through laser melt injection
  • Method for strengthening ferroalloy surface through laser melt injection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Select a forged 304 stainless steel plate and a sufficient amount of cBN ceramic particles to prepare the steel plate and ceramic particles before the experiment. By controlling the powder feeding speed, the volume fraction of the ceramic particles in the melting layer is adjusted, and the powder feeding rate is set at 35g / min. , to carry out synchronous paraxial powder feeding laser melting experiment.

[0044] S1 Place cBN ceramic particle powder material with a thickness of 45 μm to 150 μm in a drying oven, and dry it at 120° C. for 110 minutes to obtain dried cBN ceramic particles;

[0045] S2 Grind the surface of the 304 stainless steel plate to be strengthened with an angle grinder for 4 minutes, then perform ultrasonic cleaning at an ultrasonic frequency of 35 kHz for 8 minutes, and then dry the moisture on the surface of the 304 stainless steel plate with a drying oven , the drying time is 10min, and finally sandblasting is carried out to obtain the surface of t...

Embodiment 2

[0051] Select a forged 304 stainless steel plate and a sufficient amount of cBN ceramic particles to prepare the steel plate and ceramic particles before the experiment. By changing the powder feeding speed and changing the ceramic volume fraction of the melting layer, the powder feeding rate is set at 15g / min , to carry out synchronous paraxial powder feeding laser melting experiment.

[0052] S1: Place cBN ceramic particle powder material with a thickness of 45 μm to 150 μm in a drying oven, and dry at 100° C. for 120 minutes to obtain cBN ceramic particles after drying treatment.

[0053] S2: Grind the surface of the 304 stainless steel plate to be strengthened with an angle grinder for 10 minutes, then perform ultrasonic cleaning at an ultrasonic frequency of 35 kHz for 15 minutes, and then dry the surface of the 304 stainless steel plate with a drying oven Moisture, the drying time is 5min, and finally sandblasting is carried out to obtain the surface of the 304 stainless...

Embodiment 3

[0058] Select a forged 304 stainless steel plate and a sufficient amount of cBN ceramic particles to prepare the steel plate and ceramic particles before the experiment. By changing the powder feeding speed and changing the ceramic volume fraction of the melting layer, the powder feeding rate is set at 5g / min , to carry out synchronous paraxial powder feeding laser melting experiment.

[0059] S1: put cBN ceramic particle powder material with a thickness of 45 μm to 150 μm in a drying oven, and dry it at 150° C. for 90 minutes to obtain cBN ceramic particles after drying treatment;

[0060] S2: Grind the surface of the 304 stainless steel plate to be strengthened with an angle grinder for 1 minute, then perform ultrasonic cleaning at an ultrasonic frequency of 35 kHz for 5 minutes, and then dry the surface of the 304 stainless steel plate with a drying oven Moisture, the drying time is 15 minutes, and finally sandblasting is carried out to obtain the surface of the 304 stainle...

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Abstract

The invention belongs to the related technical field of metal surface treatment, and particularly discloses a method for strengthening a ferroalloy surface through laser melt injection. The method specifically includes the steps that lasers are used for conducting melt injection on the to-be-reinforced ferroalloy surface, and meanwhile, a paraxial powder feeding mode is adopted for injecting cBN ceramic particles into molten pool trailing, so that the cBN ceramic particles enter a molten pool through the molten pool trailing to form a cBNp / Fe melt injection layer after cooling, and the ferroalloy surface is strengthened through laser melt injection. According to the method, the paraxial powder feeding mode is adopted for injecting the cBN ceramic particles into the molten pool trailing toprevent the cBN ceramic particles from being directly oxidized and decomposed or directly sublimated under the action of the lasers, and meanwhile, the power density of the lasers, the paraxial inclination angle and the injection range of cBN ceramic are optimized to guarantee that the cBN ceramic is successfully and effectively injected into the ferroalloy surface to form the cBNp / Fe melt injection layer, so that the ferroalloy surface is strengthened.

Description

technical field [0001] The invention belongs to the technical field related to metal surface treatment, and more specifically relates to a method for strengthening the surface of iron alloy by laser melting injection. Background technique [0002] Ferroalloys have excellent properties such as high strength, good heat resistance, fatigue resistance and good formability, and are widely used in the fields of energy, chemical industry, machinery manufacturing, and aerospace. However, in terms of wear under certain special working conditions, the life of ferroalloys is low. Because ceramic materials have extremely high hardness properties, ceramic particle-reinforced iron-based composite materials combine the advantages of both ceramics and iron alloys. They have excellent properties such as high strength, high hardness, and wear resistance, and are widely used in wear-resistant fields. [0003] The microhardness of cubic boron nitride (cBN) is 71.54GPa, second only to diamond. ...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/10
Inventor 刘德健魏亚风陈浩
Owner HUAZHONG UNIV OF SCI & TECH
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