Blade installation seat heat treatment method

Abstract

The invention relates to a blade installation seat heat treatment method. The method is characterized in that coppering treatment is carried out on the whole surface of a blade installation seat workpiece, machining is used for remove a copper layer of an area surface to be carburized, then carburizing processing is carried out, and a carburizing purpose only in a local area can be reached. While quenching heating, a solid gas carburizer is employed for protection, oxidation and decarbonization on the surface of a carburizing layer are avoided, after quenching, a moveable constant-temperature oil groove is used for substituting an original salt bath heat treatment furnace, interprocess connection time is saved, contact of the workpiece and air at high temperature is reduced, decarburization on the surface of the carburizing layer is avoided; the condition that during a quenching transfer process, the temperature of workpiece surface is reduced to lower than Ms point (180 DEG C) can be avoided; the workpiece after isothermal quenching is placed into a tempering tool case equipped with a protection medium, insulation is carried out, the condition that the temperature of workpiece surface is reduced to lower than Ms point (180 DEG C) can be avoided; at the same time, thermal conduction can be accelerated in subsequent tempering, and energy loss is reduced.

Description

technical field [0001] The invention relates to the technical field of heat treatment of 18Cr2Ni4WA workpieces, in particular to a method for heat treatment of blade mounting seats made of 18Cr2Ni4WA material. Background technique [0002] 18Cr2Ni4WA has good processability and fatigue resistance, and has relatively ideal hardenability, toughness and good carburization controllability. It is an irreplaceable material for the production of heavy-duty transmission parts. It has a wide range of applications in the aviation industry. Uses, carburizing and nitriding the surface during manufacture is a conventional method to improve the surface hardness of the workpiece. [0003] The surface hardness of the blade mounting seat used in the aero-engine has special requirements. Due to its use characteristics, local carburization is required, such as figure 1 As shown, a blade mounting seat is made of 18Cr2Ni4WA, and the Q, R, H, and G areas in the figure are required to be carburiz...

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Problems solved by technology

[0003] The surface hardness of the blade mounting seat used in the aero-engine has special requirements. Due to its use characteristics, local carburization is required, such as figure 1 As shown, a blade mounting seat is made of 18Cr2Ni4WA, and the Q, R, H, and G areas in the figure are required to be carburized. The surface hardness is not less than 58HRC. For the non-carburized area, the hardness requirement is not less than 33-37HRC. In the quenching process after carburizing treatment, the surface is prone to oxidative decarburization and the formation of tempered sorbite in the carburized layer, and the surface hardness of the carburized surface of the blade mounting seat cannot meet the requirements

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