Nitridation loosening layer heat treatment method capable of controlling ion nitriding formation effectively

A heat treatment method, ion nitriding technology, applied in the direction of coating, solid diffusion coating, metal material coating technology, etc., can solve the problem of reducing the surface hardness and wear resistance of 42CrMo nitrided layer, affecting the contact fatigue strength of 42CrMo, reducing Surface roughness and other issues, to achieve the effect of increasing surface free energy, increasing hardness, and improving the level of nitrided porosity

Inactive Publication Date: 2017-05-10
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to improve the hardness and wear resistance of the gear surface, ion nitriding is usually used as an effective heat treatment method to improve the surface performance of gears in China at this stage. The surface hardness and wear resistance of the nitride l

Method used

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  • Nitridation loosening layer heat treatment method capable of controlling ion nitriding formation effectively
  • Nitridation loosening layer heat treatment method capable of controlling ion nitriding formation effectively
  • Nitridation loosening layer heat treatment method capable of controlling ion nitriding formation effectively

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Embodiment

[0023] Put the 42CrMo gear into the ion nitriding furnace, evacuate it to less than 10Pa, adjust the voltage to the maximum value, slowly adjust the current value until it starts to glow, and then pass in hydrogen for ion sputtering for 10 minutes, continue to pass in nitrogen, and adjust the balance of nitrogen and hydrogen. Flow ratio is 1:3, continue to heat up.

[0024] When the temperature rises to the oxidation temperature of 350°C, close the nitrogen and hydrogen valves, and let air flow in at 4L / min, the atmosphere pressure in the furnace is 100Pa, and the holding time is 0.5h.

[0025] Close the air valve, open the nitrogen and hydrogen valves, adjust the flow ratio of nitrogen and hydrogen to 1:3, continue to heat up, and start timing when the temperature reaches the nitriding temperature of 560°C for ion nitriding. The nitriding atmosphere pressure is 350Pa, and the holding time for 10h.

[0026] After ion nitriding, close the nitrogen and hydrogen valves. After t...

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Abstract

The invention relates to a nitridation loosening layer heat treatment method capable of controlling ion nitriding formation effectively. The nitridation loosening layer heat treatment method capable of controlling ion nitriding formation effectively comprises the following steps: placing a 42CrMo gear in an ion nitriding furnace, feeding hydrogen to carry out ion sputtering, and continuing feeding nitrogen; after the temperature rises to an oxidizing temperature, closing a nitrogen valve and a hydrogen valve, and feeding air; closing an air valve, opening the nitrogen valve and the hydrogen valve, and carrying out ion nitriding; and after cooling to the room temperature, taking out a sample. The nitridation loosening layer heat treatment method capable of controlling ion nitriding formation effectively has the beneficial effects that an oxidizing treatment process is added before ion nitridation, a compact oxidizing layer is generated on the surface of a material, the surface free energy is increased, loosening is eliminated, the surface hardness and the wear resistance of 42CrMo and the grade accuracy of workpieces of 42CrMo are improved, and nitridation loosening grade is increased to be grade 1 from the original grade 4; the method is simple to operate; a pre-oxidizing medium is air; moreover, the oxidizing temperature is low; and consumption of energy is reduced.

Description

technical field [0001] The invention belongs to metal surface chemical heat treatment technology, and relates to a heat treatment method for efficiently controlling a nitrided loose layer formed by ion nitriding. Background technique [0002] Gears have good comprehensive properties. In order to meet their surface wear resistance, nitriding methods are usually used, mainly including: (1) ion nitriding; (2) salt bath nitriding; (3) gas nitriding, etc. Ion nitriding chemical heat treatment is the earliest developed technology with the widest application range. It has the advantages of uniform nitriding layer, high efficiency, less pollution, short processing time, and small workpiece deformation. It has become an indispensable part of many products. Missing surface strengthening process. [0003] In order to improve the hardness and wear resistance of the gear surface, ion nitriding is usually used as an effective heat treatment method to improve the surface performance of ge...

Claims

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Application Information

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IPC IPC(8): C23C8/38C23C8/34
CPCC23C8/34C23C8/38
Inventor 胡静钱瀚杨许仁伟
Owner CHANGZHOU UNIV
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