Vacuum carburizing heat treatment process of 12CrNi3A materials

A vacuum carburizing and carburizing technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of low infiltration rate, long carburizing cycle, reduced production efficiency, etc., to improve the infiltration rate , the effect of improving fatigue performance and improving efficiency

Inactive Publication Date: 2018-03-23
JIANGXI HONGDU AVIATION IND GRP
View PDF3 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The traditional gas carburizing temperature is generally between 880°C and 930°C. Due to the low temperature and low penetration rate, the carburizing cycle is generally long, which not only reduces production efficiency, but also wastes energy
[0004] 2) The tradit

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Vacuum carburizing heat treatment process of 12CrNi3A materials
  • Vacuum carburizing heat treatment process of 12CrNi3A materials
  • Vacuum carburizing heat treatment process of 12CrNi3A materials

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] The present invention is described in detail below in conjunction with the accompanying drawings:

[0028] The process of vacuum carburizing heat treatment of 12CrNi3A material is carried out on the vacuum carburizing equipment, and the heat treatment process steps are (according to figure 2 Process steps for typical parts):

[0029] (1) Carburizing: The carburizing process generally consists of three stages: exhaust heating, carburizing (including strong infiltration and diffusion), and cooling and cooling.

[0030] ① After the parts are installed in the furnace, the gas in the furnace is discharged as soon as possible, and the temperature is raised to 920-930 °C.

[0031] ②After the temperature is stable, the carburizing stage begins, the furnace temperature remains unchanged, and the pressure in the furnace is controlled at 750-800Pa. First perform strong infiltration for about 1min, diffusion for about 2min, and circulate 3 times for a total of about 9min. Then ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a vacuum carburizing heat treatment process of 12CrNi3A materials and belongs to the technical field of carburizing. The vacuum carburizing heat treatment process of 12CrNi3Amaterials is a chemical heat treatment method of the machine building industry. Through the process tests of vacuum carburizing and subsequent heat treatment, and through quality evaluation and performance analysis of a carburizing sample as well as the diffusion layer tissue and the core tissue of a part, technological parameters of vacuum carburizing of the 12CrNi3A materials and a post-carburizing heat treatment process are optimized. The vacuum carburizing technology is a more advanced technology at present. The vacuum carburizing technology mainly has specialities that high temperature short time carburizing can be conducted; grain boundary oxidation is not existed; surface incomplete quenching layer is not produced; carburizing layer controlling is simple; and complex shape carburizing such as slim hole and blind hole can be conducted.

Description

technical field [0001] The invention relates to a vacuum carburizing heat treatment process for 12CrNi3A material, belongs to the technical field of carburizing, and is a chemical heat treatment method in the machinery manufacturing industry. Background technique [0002] At present, the carburizing process of 12CrNi3A parts is mostly the traditional gas carburizing process, and there are the following problems: [0003] 1) The traditional gas carburizing temperature is generally 880 ℃ ~ 930 ℃, due to the low temperature, low infiltration rate, and generally long carburizing cycle, which not only reduces production efficiency, but also wastes energy. [0004] 2) Traditional gas carburizing has certain difficulty in carburizing the inner wall of deep hole and blind hole parts. [0005] 3) For gas carburizing, the stainless steel material has a dense oxide film on the surface, which makes the carburizing of stainless steel difficult to solve. SUMMARY OF THE INVENTION [00...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C8/22C21D1/18C21D6/04
CPCC23C8/22C21D1/18C21D6/004C21D6/04
Inventor 漆诚周航吴宁胡建冬
Owner JIANGXI HONGDU AVIATION IND GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products