A Method for Avoiding Recrystallization of the Cavity of Single Crystal Hollow Blades

Abstract

The invention discloses a method for avoiding recrystallization of the inner cavity of a single-crystal hollow blade, and belongs to the field of high-temperature alloy precision casting. At least one anti-recrystallization position is set on the surface of the ceramic core to obtain a hollow blade wax mold with at least one anti-recrystallization cavity; an anti-recrystallization flange is set at the anti-recrystallization cavity; the hollow blade is After dewaxing inside the shell, the single crystal superalloy is used for casting and shelling; the obtained single crystal hollow blade blank is subjected to heat treatment and mechanical processing to obtain a complete single crystal hollow blade without recrystallization defects. The method of the invention has the advantages of simple and reliable process, low cost and easy operation. Since the blade can effectively eliminate the recrystallization defect in the casting of the single crystal blade during the casting stage, the performance of the blade is better, and the blade has greater application and economic value.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy precision casting, and in particular relates to a method for avoiding recrystallization of the inner cavity of a single-crystal hollow blade. Background technique [0002] With the continuous increase of the inlet temperature of the turbine, the single crystal blade of the aero-engine has experienced the process from solid to complex hollow structure. As the structure of the single crystal hollow blade becomes more and more complex, during the solidification process, due to the shrinkage mismatch between the molten metal, core, and shell, etc., slight plastic deformation will occur in the inner cavity of the blade, resulting in stress concentration. During the heat treatment of the blade, this part of the stress will be released and the nucleation and growth of new grains will be induced, resulting in recrystallization in some key parts of the blade. As a defect, recrystallization reduces th...

AI Technical Summary

Problems solved by technology

At present, in many studies, methods such as recovery heat treatment, carburizing, and surface corrosion are used to control the recrystallization of single crystal superalloys, but the effects of recovery heat treatment, carburization, and surface corrosion on blade recrystallization, especially the control effect Very limited, and surface corrosion methods can affect the surface quality of other non-recrystallized areas of the blade, causing irreversible damage to single crystal superalloy blades

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