Vacuum carburizing heat treatment process of 12CrNi3A materials

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...

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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 traditional gas carburizing has certain difficulty in carburizing the inner wall of deep hole and blind hole parts.

[0005] 3) For gas carburization, the stainless steel material has a dense oxide film on the surface, making it difficult to solve the carburization of stainless steel

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