Secondary carburizing technological method of 16Cr3NiWMoVNbE material

Abstract

The invention relates to a secondary carburizing technological method of a 16Cr3NiWMoVNbE material. The method comprises the steps as follows: protecting a non-carburizing part; carburizing a carburizing part with requirement on a deep layer; continuously processing a part after carburizing until reaching the carburizing layer with requirements on carburizing degree and shallow carburizing layer; not processing the position of the deep carburizing layer; protecting other positions except for the carburizing position; and carburizing for the second time. By adopting the method, the depth of the carburizing layer in the carburizing part at the deep layer is 1.1 to 1.3mm; the depth of the carburizing layer in the carburizing part at the shallow layer is 0.2 to 0.5mm; the surface hardness is more than HRC600 after the carburizing in the deep layer; the surface hardness is more than HRC52 after the carburizing in the shallow layer; the hardness of the core is HRC35 to 45; and the microscopic structure on the surface and the microscopic structure on the core meet corresponding requirements of Aviation Standard 5492.

Description

technical field [0001] The invention relates to a secondary carburizing process method, in particular to a secondary carburizing process method for 16Cr3NiWMoVNbE material. Background technique [0002] 16Cr3NiWMoVNbE material is a special material used in the aviation field. It is processed into parts and heat treated from this material. Due to the special use requirements in the aviation field, the depth of the carburized layer in different parts of the parts is required to be different after heat treatment, and the difference is very large. The deep part requires 1.1mm~1.3mm, and the shallow part requires 0.2mm~0.5mm. After the parts are heat treated, the deep surface hardness is required to be greater than HRC60, the surface hardness of the shallow part is greater than HRC52, and the core hardness is HRC35~45, which can guarantee The internal comprehensive mechanical performance index can ensure the high strength and high wear resistance of different surfaces, and ensure...

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 inconsistent depth of the carburized layer, the carburizing process of these two parts cannot be carried out simultaneously, and secondary carburizing is required. There is no molding technology in China.