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Carburization processing method

A carburizing treatment and treatment method technology, which is applied in the field of carburizing treatment, can solve the problems of reduced service life of workpieces, reduction of microhardness of workpieces, failure to improve surface hardness, etc., and achieve the effect of improving surface hardness and macroscopic hardness

Active Publication Date: 2014-03-26
青岛德盛机械制造有限公司
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  • Claims
  • Application Information

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Problems solved by technology

However, since the amount of retained austenite will increase after quenching for workpieces treated with high carburizing and carburizing potential, this method not only fails to 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

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Embodiment

[0069] Use the UBE-600 multi-purpose furnace for example figure 1 The motorcycle crankshaft engine connecting rod shown is carburized.

[0070] Step a) as figure 2 As shown, the workpiece is placed in a mixed gas of methane and hydrogen at a carburizing temperature of 930 ° C for 30 minutes, and is kept at a carbon potential of 1.2% for 120 minutes, and then kept at a carbon potential of 1.1% for 200 Minutes, then diffused under 0.8% carbon potential for 120 minutes, and finally cooled to 860°C with the UBE-600 multi-purpose furnace, and cooled in the front chamber of the heating furnace for 120 minutes;

[0071] Step b) if image 3 As shown, the workpiece treated in step a) is placed in a mixed gas of methane and hydrogen after 30 minutes of uniform temperature at a carburizing temperature of 930 ° C, kept at a 1.2% carbon potential for 90 minutes, and then Insulate for 60 minutes under a carbon potential of 0.8%, then diffuse for 60 minutes under a 0.8% carbon potential,...

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Abstract

An embodiment of the invention discloses a carburization processing method. Composite carburization is adopted in the carburization processing method. First a workpiece is placed in a carburization medium of 900-980 DEG C, thermal insulation and cooling are carried out, then the workpiece is continuously placed in the carburization medium of 900-980 DEG C, and thermal insulation is performed. After carburization for the first time, the surface of the workpiece has a certain carbon concentration distribution and macroscopic thickness. Meanwhile, carburization for the second time in the step (b) is utilized to improve carbon concentration of the surface of the workpiece, and accordingly macrohardness and surface hardness of the surface of the workpiece are improved. Experimental results show that the macroscopic thickness of the workpiece processed by the method is 0.78-1mm, and the hardness at the position of 0.15mm is larger than 700HV.

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 common method is: put the workpiece into the act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/26C21D1/18
Inventor 孙成勤韦海章
Owner 青岛德盛机械制造有限公司
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