Deep nitriding method for 32cr3move material

A nitriding and deep-layer technology, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of no forming, deep nitriding layer depth, etc., and achieve the effect of controlling the deformation of parts

Inactive Publication Date: 2014-02-12
HARBIN DONGAN ENGINE GRP
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  • Summary
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AI Technical Summary

Problems solved by technology

The general heat treatment method of this material is difficult to achieve the above indicators. Due to the deep depth of the nitrided layer, there is no molding technology in China.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The fixed ring gear used in an aero-engine is made of 32Cr3MoVE, and the maximum outer diameter reaches φ648mm. The ring gear is subjected to deep nitriding treatment, and the steps are as follows:

[0023] (1) Prepare the fixed ring gear to be deep-layer nitriding made of 32Cr3MoVE material;

[0024] (2) Quenching and tempering treatment: put the parts in a heating furnace and heat them up to 950°C for 1 hour and 55 minutes for oil cooling, then heat them up to 630°C for 3.5 hours and then air-cool them, then machine them to rough out the deep nitriding surface of the parts;

[0025] (3) Stabilization treatment: put the parts in the nitriding furnace, raise the temperature to 560°C, keep it warm for 11 hours, fill it with argon gas at the same time of heating up and keeping warm, the flow rate is 3L / min, cool down after keeping warm, the flow rate of argon gas during cooling When the temperature is greater than 6L / min and the temperature drops to 140°C, the argon gas w...

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PUM

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Abstract

The invention relates to a method for deep layer nitriding of 32Cr 3MoVE material. Controllable atmosphere nitriding technology is used to nitriding the nitriding surface required for the deep layer. Through reasonable setting of parameters, the carburized layer depth at the gear part can be guaranteed to be above 0.47mm. After deep nitriding, the surface hardness is greater than HR15N92.5, and the hardness of the core is HRC36-43, so that the surface microstructure and the microstructure of the core conform to the navigation mark 5022 "Nitriding and Nitrocarburizing Metallographic Structure Inspection of Aeronautical Steel Parts" The corresponding requirements of "Standard" and the nitriding heat treatment method that can effectively control the deformation of parts.

Description

technical field [0001] The invention relates to a nitriding method, in particular to a method for deep layer nitriding of 32Cr3MoVE material. Background technique [0002] 32Cr3MoVE material is a special material used in the aviation field. Due to the special application requirements in the aviation field, it is processed into parts from this material and then undergoes deep nitriding after heat treatment. The depth of the chemical layer is required to be ≥0.18mm, the hardness of the deep layer is required to be HR15N≥92.5, and the hardness of the core is HRC36~43, which can not only ensure the internal comprehensive mechanical performance indicators, but also ensure the high strength and high wear resistance of different surfaces, and ensure the material The microstructure of the surface and the microstructure of the core meet the corresponding requirements of the navigation mark 5022 "Nitriding and Nitrocarburizing Metallographic Inspection Standards for Aeronautical Steel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/26C23C8/02
Inventor 于忠军师玉英鹿泽伦徐奉鑫辛玉武刘百成曾西军李鹏刚刘慧张宇慧张琼
Owner HARBIN DONGAN ENGINE GRP
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