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A method for controlling carburization of metallographic structure of bg801 material

A technology of metallographic structure and control method, which is applied in the field of carburizing control of BG801 material metallographic structure, can solve the problems of unqualified metallographic structure and failure to meet the design process, etc.

Active Publication Date: 2022-04-01
HARBIN DONGAN ENGINE GRP
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Problems solved by technology

[0003] However, in the existing technology, after the low-pressure vacuum carburizing process is carried out on this material steel, a large amount of primary special carbide M7C3 will be precipitated in the form of Widmanstatten structure, resulting in serious unqualified metallographic structure, which cannot meet the design process requirements

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  • A method for controlling carburization of metallographic structure of bg801 material

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Embodiment

[0016] The depth of the carburized layer of BG801 material is required to be 0.70-0.90mm, the carburizing process temperature is 980°C, the supply of acetylene is 1200L / h, and N can be supplied in the pulse diffusion stage. 2 , supply N 2 When the flow rate is 1500L / h, the adjustment process system of the pulse parameters is shown in Table 1 below.

[0017] Table 1 Low pressure vacuum carburizing pulse parameter list

[0018]

[0019] After performing this process, after 1060°C quenching + -70°C ice cooling + 500°C aging + -190°C deep cooling + 500°C secondary aging, the penetration layer depth from microhardness to Vickers hardness HV580 is 0.89mm, and the metallographic structure There is no primary carbide precipitated in the Widmanstatten structure, which meets the design requirements.

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Abstract

The invention belongs to the technical field of metal heat treatment, and relates to a method for controlling carburization of metallographic structure of BG801 material. The metallographic structure carburization control method of the BG801 material of the present invention, after blasting the carburized surface, adopts the pulse strong infiltration method to carry out multiple cycle carburization on the carburized surface, wherein, each pulse process is to first vacuumize, and then pass through Acetylene, then, vacuum again, and then pass nitrogen, in each pulse, pulse diffusion time / pulse infiltration time ≥ 100. The carburizing control method of the BG801 material metallographic structure of the present invention optimizes the carburizing process parameters of the BG801 material, especially the strict control of the strong infiltration time, so as to ensure that the depth of the carburizing layer of BG801 meets the requirements, and can effectively avoid metallurgy. There is no Widmanstatten primary carbide acicular structure in the phase structure, so that the BG801 material meets the design requirements after carburizing.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and relates to a method for controlling carburization of the metallographic structure of BG801 material. Background technique [0002] BG801 belongs to ultra-high alloy steel, the alloying composition is as high as 30wt.%, contains a large amount of strong carbide-forming elements such as Cr and Mo, and has excellent high-temperature red hardness. Due to the high carburizing temperature of this material, carburizing is extremely difficult , At present, only the low-pressure vacuum carburizing process can be used for surface strengthening treatment. [0003] However, in the prior art, after the low-pressure vacuum carburizing process is performed on this material steel, a large amount of primary special carbide M7C3 will be precipitated in the form of Widmanstatten structure, resulting in serious unqualified metallographic structure, which cannot meet the design process requirements. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/22
CPCC23C8/22
Inventor 孙振淋钱钰辛玉武何培刚
Owner HARBIN DONGAN ENGINE GRP
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