Surface treatment method for high-carbon steel part

A technology for surface treatment and high carbon steel, applied in metal material coating technology, coating, solid diffusion coating, etc. Difficult to control and other problems to achieve the effect of avoiding deformation and cracking, improving surface hardness, and controlling the quality of the seepage layer

Active Publication Date: 2016-03-02
QINGDAO CHOHO IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems in the prior art that the working environment of salt bath metal infiltration is harsh, the quality of the infiltrated layer is difficult to control, the work efficiency is low, high carbon steel is not easy to carburize, and quenching easily causes deformation of parts, the invention provides a high carbon steel part Surface treatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Select GCr15 round bar as the test material, the bar stock is 30mm long and 8mm in diameter, put it into a well-type gas nitrocarburizing furnace for rare earth nitrocarburizing, wherein the carburizing agent is methanol, and the nitriding agent is ammonia , The rare earth infiltration agent is dissolved in methanol, the volume ratio of the rare earth infiltration agent to methanol is 1:80, the nitrocarburizing temperature is 570°C, and the ammonia flow rate is 200L / h. Co-infiltration time 1 hour, quenched into quenching oil. After removing the oil and rust on the surface of the workpiece, do metal penetration treatment. The metal infiltration process is the same as that of Comparative Example 1.

Embodiment 2

[0028] Example 2: Select GCr15 round bar as the test material, the bar stock is 30mm long and 8mm in diameter, put it into a well-type gas nitrocarburizing furnace for rare earth nitrocarburizing, wherein the carburizing agent is methane, and the nitriding agent is ammonia , The rare earth infiltration agent is dissolved in methane, the volume ratio of the rare earth infiltration agent to methane is 1:100, the nitrocarburizing temperature is 580°C, and the ammonia flow rate is 200L / h. Co-infiltration time 1 hour, quenched into quenching oil. After removing the oil and rust on the surface of the workpiece, do metal penetration treatment. The metal infiltration process is the same as that of Comparative Example 1.

[0029] In the above-mentioned embodiment, the thickness comparison of the permeated metal layer is as follows:

[0030] test

[0031] It can be seen from the above table that after the workpiece is treated with nitrocarburized rare earth, the metal infilt...

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Abstract

The invention relates to a surface treatment method for a high-carbon steel part. Nitrogen-carbon rare earth co-diffusion is carried out on the part before metal cementation. Compared with the prior art, nitrogen-carbon rare earth co-diffusion pretreatment is carried out on the high-carbon steel part before metal cementation, carbon concentration higher than that of a base body, large lattice distortion and many defects are formed on the surface of a metal workpiece, and therefore diffusion of metal atoms and carbon atoms can be accelerated; and metal cementation is more efficient, and a cementation layer is dense and firm.

Description

Technical field: [0001] The invention relates to a chemical heat treatment method, in particular to a metal surface metallization heat treatment method. technical background: [0002] Under normal conditions of use, the failure of steel mostly originates from the surface. Surface strengthening technology can change the composition, structure and structure of the surface of the material, improve the surface performance, and significantly prolong the service life of the material. Surface metallization is a common method for surface strengthening of metal parts. [0003] Metal infiltration is a chemical heat treatment process that infiltrates one or more metal atoms into the surface of a metal workpiece. Put the metal workpiece in the infiltrating agent containing the infiltrating metal elements, heat it to a certain temperature, and keep it for an appropriate time. The active atoms infiltrating the metal elements generated by the thermal decomposition of the infiltrating agen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/00C21D1/20
CPCC21D1/20C23C12/00
Inventor 金玉谟尚召华刘营高配彬
Owner QINGDAO CHOHO IND CO LTD
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