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Carburizing treatment method

A treatment method, a carburizing treatment technology, is applied in the direction of coating, metal material coating process, solid diffusion coating, etc., which can solve the problems of reduced service life of the workpiece, reduction of the microhardness of the workpiece, and inability to improve the surface hardness, etc., to achieve Effect of improving surface hardness and improving macro hardness

Inactive Publication Date: 2016-11-09
南通三荣实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the amount of retained austenite will increase after quenching of the workpiece treated with high carburizing and carburizing potential, this method not only cannot improve the surface hardness of the workpiece, but reduces the microhardness of the workpiece and reduces the service life of the workpiece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of carburizing treatment method provided by the present invention comprises:

[0037] Step a) placing the workpiece in a carburizing medium at 880°C, keeping it warm, and cooling;

[0038] Step a1) placing the workpiece in a carburizing medium with a temperature of 880°C and a carbon potential of 0.5% for 4 hours;

[0039] Step a11) placing the workpiece in a carburizing medium with a temperature of 880° C. and a carbon potential of 1.2% for 2 hours;

[0040] Step a12) keeping the workpiece processed in step a11) in a carburizing medium with a carbon potential of 1.1% for 3 hours;

[0041] Step a13) diffusing the workpiece treated in step a12) in a carburizing medium with a carbon potential of 0.8% for 2 hours;

[0042] The workpiece after step a1) is placed in the air for 1 hour;

[0043] Step a2) cooling the workpiece treated in step a1).

[0044] Step b) placing the workpiece treated in step a) in a carburizing medium at 880° C., and keeping it warm.

[0...

Embodiment 2

[0056] A kind of carburizing treatment method provided by the present invention comprises:

[0057] Step a) placing the workpiece in a carburizing medium at 980°C, keeping it warm, and cooling;

[0058] Step a1) placing the workpiece in a carburizing medium with a temperature of 980° C. and a carbon potential of 1.5% for 12 hours;

[0059] Step a11) placing the workpiece in a carburizing medium with a temperature of 940° C. and a carbon potential of 1.2% for 4 hours;

[0060] Step a12) keeping the workpiece treated in step a11) in a carburizing medium with a carbon potential of 1.1% for 3 to 5 hours;

[0061] Step a13) diffusing the workpiece treated in step a12) in a carburizing medium with a carbon potential of 0.8% for 2 hours;

[0062] Place the workpiece after step a1) in the air for 5 hours;

[0063] Step a2) cooling the workpiece treated in step a1).

[0064]Step b) placing the workpiece treated in step a) in a carburizing medium at 980° C., and keeping it warm.

...

Embodiment 3

[0076] A kind of carburizing treatment method provided by the present invention comprises:

[0077] Step a) placing the workpiece in a carburizing medium at 940°C, keeping it warm, and cooling;

[0078] Step a1) placing the workpiece in a carburizing medium with a temperature of 940° C. and a carbon potential of 1.0% for 8 hours;

[0079] Step a11) placing the workpiece in a carburizing medium with a temperature of 910° C. and a carbon potential of 1.2% for 3 hours;

[0080] Step a12) keeping the workpiece treated in step a11) in a carburizing medium with a carbon potential of 1.1% for 4 hours;

[0081] Step a13) diffusing the workpiece treated in step a12) in a carburizing medium with a carbon potential of 0.8% for 2 hours;

[0082] Place the workpiece after step a1) in the air for 3 hours;

[0083] Step a2) cooling the workpiece treated in step a1).

[0084] Step b) placing the workpiece treated in step a) in a carburizing medium at 940° C., and keeping it warm.

[0085...

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PUM

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Abstract

The invention provides a carburizing treatment method. The carburizing treatment method adopts a composite carburizing method. A workpiece is placed in a carburizing medium with the temperature being 900-980 DEG C at first, heat preservation and cooling are conducted, then the workpiece continues to be placed in the carburizing medium with the temperature being 900-980 DEG C, and heat preservation is conducted. According to the carburizing treatment method, after the first time of carburizing, the workpiece surface has the carbon concentration distribution and macro thickness to a certain extent. Meanwhile, the carbon concentration on the workpiece surface is increased through the second time of carburizing in the step (b), so that the macro hardness and surface hardness of the workpiece surface are improved. Experimental results show that the macro thickness of the workpiece treated through the method is 0.78-1 mm, and the hardness of the position, 0.15 mm thick, of the workpiece is greater than 700 HV.

Description

technical field [0001] The present invention relates to the technical field of treatment methods, and more specifically, relates to a carburizing treatment method. Background technique [0002] The carburizing treatment method is a metal surface treatment method and the main heat treatment method for components with wear as the main failure mode. Specifically, the carburizing treatment method is to increase the carbon content of the surface layer of the steel piece and form a certain carbon concentration gradient. The steel piece is heated and kept warm in the carburizing medium, so that carbon atoms can penetrate into the surface layer. Chemical heat treatment process. Carburizing treatment methods include solid carburizing method, liquid carburizing method, vacuum carburizing method and gas carburizing method. [0003] At present, most of the workpieces that need to be carburized are low carbon steel or low alloy steel. The activated carbon atoms decomposed in the carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22
CPCC23C8/22
Inventor 周其福
Owner 南通三荣实业有限公司
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