A method of laser surface carburizing of low carbon steel
A low-carbon steel and laser technology, applied in the direction of solid-state diffusion coating, coating, metal material coating process, etc., can solve the problems of many holes in the carbon powder layer, residual oxygen, and weak combination of carbon powder and substrate , to improve the surface hardness and fatigue performance, prolong the service life
Active Publication Date: 2022-04-29
北京煜鼎增材制造研究院股份有限公司
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Problems solved by technology
[0004] However, if the traditional direct powder laying or physical deposition method is used to pre-set the toner, it is easy to cause the toner to be not firmly bonded to the substrate, there are many holes in the toner layer, and oxygen and moisture remain in the toner gap, which will affect the entire process. Laser surface carburizing process
Especially for nano-scale carbon powder with high activity, it is easy to agglomerate and bond, and it is difficult to spread powder
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[0031] The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.
[0032] Specifically, the laser surface carburizing method for low carbon steel of the present invention mainly includes the following steps:
[0033] 1. Preparation of colloidal mixture of liquid paraffin and carbon powder
[0034] In this step, the ratio of paraffin and carbon powder is the key to the preparation of the colloidal mixture. If the content of carbon powder is too high, it is easy to agglomerate and cannot be uniformly dispersed in the liquid paraffin; if the content of carbon powder is too low, it will cause paraffin and The carbon content in the carbon powder mixed film is not enough to achieve the ideal carburizing effect. It is preferred that when the carbon powder content is 65%-70%, an ideal colloidal mixture can be obtained.
[0035] The preparation process of the coll...
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Abstract
The invention discloses a laser surface carburizing method for low carbon steel, which comprises the following steps: 1) preparing a colloidal mixture of liquid paraffin and carbon powder, the carbon powder content is 65-70%; 2) in the carbon powder to be coated A composite film of paraffin wax and carbon powder is prepared on the surface, and the thickness of the composite film is 2.5-3 mm; 3) In an atmosphere with an oxygen content of less than 1 ppm, laser scanning is performed on the surface of the mild steel for carburizing treatment. The invention utilizes the laser surface carburizing technology to carburize the low carbon steel, which can improve the surface hardness and fatigue performance of the parts. The invention adopts a special carbon coating method to efficiently preset carbon powder, and realizes the recycling of carbon powder and paraffin at the same time. Therefore, a simple, efficient, green and environmentally friendly new treatment method can be provided for the surface strengthening of low carbon steel metal parts, and the service life of metal parts can be prolonged.
Description
technical field [0001] The invention relates to the technical field of heat treatment strengthening of low-carbon steel, in particular to a laser surface carburizing method for low-carbon steel. Background technique [0002] Due to its low carbon content, low carbon steel cannot obtain a high-strength and high-hard martensite structure after quenching, and generally needs to be carburized. Due to its long holding time and slow cooling rate, conventional carburizing treatment tends to produce coarse martensite and carbide phases, which is extremely detrimental to the toughness and fatigue strength of the parts. [0003] Laser surface carburizing technology uses a laser beam of energy density to quickly scan metal parts, so that the surface temperature rises at a very fast speed to above the austenite transformation temperature and below the melting point, and carbon elements rapidly diffuse into the surface of metal parts. When the beam leaves the surface, the matrix of the ...
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IPC IPC(8): C23C8/66
CPCC23C8/66
Inventor 不公告发明人
Owner 北京煜鼎增材制造研究院股份有限公司