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Carburizing and quenching process

A carburizing quenching and process technology, which is applied in the direction of quenching agent, metal material coating process, manufacturing tools, etc., can solve the problems of reducing fatigue resistance and wear resistance, shortening service life, long carburizing time, etc., and achieves improvement Carburizing effect, extended service life, and low volatility effect

Inactive Publication Date: 2017-10-13
JIANGSU FENGDONG HEAT TREATMENT & SURFACE MODIFICATION ENG & TECH RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, when carburizing and quenching is carried out, carburizing is generally performed once. The carburizing time is very long, and the metal is in a high-temperature state for a long time, which will cause the metal hardness to be low, reduce fatigue resistance and wear resistance, and shorten the service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The carburizing and quenching process of the present embodiment comprises the following steps:

[0033] (1) Carburizing

[0034] A. Carburizing once, put the workpiece in the heating furnace, and the heating furnace is raised from room temperature to 900°C for carburizing, and the carburizing time is 1h;

[0035] B. Air cooling, the workpiece after primary carburizing is accelerated to room temperature by air cooling at a cooling rate of 10°C / s;

[0036] C. Secondary carburizing, the workpiece is placed in the heating furnace, and the heating furnace is raised from room temperature to 900°C for carburizing. The carburizing time is 2 hours, and the carbon potential CP of the strong carburizing stage in carburizing is 1.12C%. The carbon potential CP in the diffusion stage is 0.75C%;

[0037] D. Water cooling, using water cooling to cool the workpiece after secondary carburizing to room temperature at a cooling rate of 13°C / s;

[0038] (ii) Quenching

[0039] a. For p...

Embodiment 2

[0052]The carburizing and quenching process of the present embodiment comprises the following steps:

[0053] (1) Carburizing

[0054] A. Carburizing once, put the workpiece in the heating furnace, and the heating furnace is raised from room temperature to 950°C for carburizing, and the carburizing time is 2.5h;

[0055] B. Air cooling, the workpiece after primary carburizing is accelerated to room temperature by air cooling at a cooling rate of 12°C / s;

[0056] C. Secondary carburizing, the workpiece is placed in the heating furnace, and the heating furnace is raised from room temperature to 950°C for carburizing. The carburizing time is 3 hours, and the carbon potential CP of the strong carburizing stage in carburizing is 1.15C%. The carbon potential CP in the diffusion stage is 0.85C%;

[0057] D. Water cooling, using water cooling to cool the workpiece after secondary carburizing to room temperature at a cooling rate of 15°C / s;

[0058] (ii) Quenching

[0059] a. For ...

Embodiment 3

[0072] The carburizing and quenching process of the present embodiment comprises the following steps:

[0073] (1) Carburizing

[0074] A. Carburizing once, put the workpiece in the heating furnace, and the heating furnace is raised from room temperature to 930°C for carburizing, and the carburizing time is 2 hours;

[0075] B. Air cooling, the workpiece after primary carburizing is accelerated to room temperature by air cooling at a cooling rate of 11°C / s;

[0076] C. Secondary carburizing, the workpiece is placed in the heating furnace, and the heating furnace is raised from room temperature to 930°C to carburize. The carburizing time is 2.5h, and the carbon potential CP of the strong carburizing stage in carburizing is 1.13C%. , the carbon potential CP in the diffusion stage is 0.81C%;

[0077] D. Water cooling, using water cooling to cool the workpiece after secondary carburizing to room temperature at a cooling rate of 14°C / s;

[0078] (ii) Quenching

[0079] a. For ...

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Abstract

The invention relates to a carburizing and quenching process, which belongs to the technical field of heat treatment of metal. The carburizing and quenching process comprises the steps of carburizing for the first time, carburizing for the second time, quenching for the first time, quenching for the second time, tempering at high temperature and tempering at low temperature. According to the carburizing and quenching process designed by the invention, two-time carburization is adopted during carburization, and the carburizing time of each time is shortened, so that the defects that metal hardness is low due to long-time heating and the anti-fatigue performance and the wear resistant performance are reduced can be effectively prevented, and the service life of a workpiece is greatly prolonged; in addition, two-time quenching is adopted, so that residual stress of the workpiece can be preferably released, and the service life is prolonged.

Description

technical field [0001] The invention relates to a carburizing and quenching process, which belongs to the technical field of metal heat treatment. Background technique [0002] Carburizing and quenching is a common heat treatment process for metal materials. It can make the surface of the carburized workpiece obtain high hardness and improve its wear resistance. Traditional processes mainly include: low temperature tempering, pre-cooling direct quenching, primary heating quenching, carburizing high temperature tempering, secondary quenching cold treatment, induction heating after carburizing and other processes. Quenching process is widely used in modern machinery manufacturing industry. The important parts in machinery, especially the steel parts used in automobiles, airplanes and rockets, are almost all quenched. In order to meet the technical requirements of various parts, various quenching processes have been developed. [0003] Carburizing is the process of infiltrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/20C23C8/44C23C8/64C21D1/19C21D1/58
CPCC23C8/20C21D1/19C21D1/58C23C8/44C23C8/64
Inventor 史有森袁彬
Owner JIANGSU FENGDONG HEAT TREATMENT & SURFACE MODIFICATION ENG & TECH RES CO LTD
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