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Steel surface composite processing method using plasma electrolytic carburization and then boro-carbonization

A technology of plasma and boron carburizing, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of low solid solubility, slow growth speed of the infiltrated layer, and affecting the bonding force of the infiltrated layer. , to achieve the effects of reducing the hardness gradient, shortening the co-infiltration time, and improving the overall service life

Inactive Publication Date: 2016-08-24
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the solid solubility of boron in pure iron is very small, the growth rate of the infiltrated layer is slow during boronizing treatment, and the hardness difference between the boronized layer and the iron matrix is ​​very large, which affects the bonding force of the infiltrated layer.

Method used

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  • Steel surface composite processing method using plasma electrolytic carburization and then boro-carbonization
  • Steel surface composite processing method using plasma electrolytic carburization and then boro-carbonization
  • Steel surface composite processing method using plasma electrolytic carburization and then boro-carbonization

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Experimental program
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Effect test

Embodiment 1

[0014] (1) Pre-treatment of the workpiece: the workpiece is selected as Q235 low-carbon steel, the surface hardness is 171HV, and the processing size is 55mm×16mm×1.5mm. The workpiece is cleaned with alcohol and dried.

[0015] (2) Plasma electrolytic carburizing pretreatment: Add 1L glycerin, 800ml deionized water, 140g sodium carbonate and 91g sodium chloride into the electrolytic cell, and keep stirring until completely mixed. Put the Q235 low-carbon steel sample into the prepared liquid-phase plasma carburizing electrolyte, use the Q235 low-carbon steel sample as the cathode, and graphite material as the anode, apply a voltage of 320V, and carry out carburizing treatment for 10 minutes, and the thickness can be obtained. The 80μm carburized layer has a hardness of 820HV. Denote this artifact as S1.

[0016] (3) Plasma electrolytic boron carburizing: Add 2L deionized water, 900ml glycerin, 1400g borax, 390g sodium bicarbonate, 390g sodium sulfate and 280g potassium chlori...

Embodiment 2

[0027] According to the method of Example 1, the performance test of the Q235 low-carbon steel matrix without compound treatment was carried out, so as to compare and analyze the performance difference of the steel sample before and after the compound treatment. The results are shown in Table 1.

[0028] Table 1: Performance test results of Q235 low-carbon steel substrate and samples treated with plasma electrolytic carburizing and then boron carburizing

[0029]

[0030] Table 1 shows the performance test results of the embodiment of the present invention on the Q235 low-carbon steel substrate and the sample treated with plasma electrolytic carburizing and then borocarburizing composite treatment under appropriate solution ratio and voltage conditions. It can be seen from Table 1 that after the electrolyte solution in this embodiment and the composite treatment process of plasma electrolytic carburizing and then borocarburizing are used to treat the surface of the Q235 ste...

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Abstract

The invention belongs to the technical field of steel surface modification heat treatment technology, and specifically relates to a steel surface composite processing method using plasma electrolytic carburization and then boro-carbonization. The method comprises the following steps: (1) putting a steel sample into a carburizing solution, taking the steel sample as the negative electrode and a graphite material as the positive electrode, applying a voltage of 220 to 400 V on two electrodes at a room temperature, and carrying out a treatment for 3 to 5 minutes to obtain a carburization layer with a thickness of 15 to 90 [mu]m; (2) taking the sample which has been subjected to a carburization treatment as the negative electrode, putting the sample into a boro-carbonization solution, taking graphite as the positive electrode, applying a voltage of 200 to 500 V on two electrodes, carrying out a treatment for 10 to 30 minutes to obtain a boro-carbonization layer with a thickness of 20 to 100 [mu]m. The hardness of the obtained boro-carbonization layer can reach 1500 to 2400 HV, the hardness is improved by 10 to 15 times, compared with the steel matrix, and moreover, the wear resistant performance and durability are greatly improved. At the same time, the friction coefficient and wear rate of the boro-carbonization layer are 1 / 5-1 / 8 and 1 / 21-1 / 25 of those of steel matrix. The friction and wear resistant performance of steel is prominently improved by the plasma electrolysis-boro-carbonization treatment. Furthermore, the technology does not need any post treatment, and is simple, the deformation of workpiece is little, and the cost is reduced.

Description

technical field [0001] The invention relates to a composite treatment method for plasma electrolytic carburizing followed by borocarburizing on the surface of steel, belonging to the technical field of steel surface modification heat treatment technology. Background technique [0002] Generally, steel materials need to have good lubrication and wear resistance in practical applications. Surface boronizing is a chemical heat treatment method for metal surface strengthening. It is an effective method to improve the wear resistance of steel by infiltrating boron into steel and alloys to obtain iron borides. The boronizing layer has high hardness, good wear resistance, and the boronizing layer also has high corrosion resistance, which makes the boronizing process widely used in the heat treatment of various tools, molds and wear-resistant workpieces. However, due to the high hardness of the boronizing layer, which can generally reach 1000HV-2000HV, which is many times higher th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38C23C8/34
Inventor 薛文斌王彬刘润吴杰杜建成张亦凡
Owner BEIJING NORMAL UNIVERSITY
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