Method for preparing single crystal blades based on double-induction directional recrystallization of ultrafine nickel powder area

Abstract

The invention relates to a method for preparing single crystal blades based on double-induction directional recrystallization of an ultrafine nickel powder area. Ultrafine single crystal nickel powder serves as a main raw material; other ultrafine metal powder is added according to the high-temperature alloy material prescription requirement; and the nickel-based high-temperature alloy single crystal turbine blades of an airplane engine are prepared through the method of smelting, directional solidification and recrystallization of the double-constraint induction area of an electromagnetic field after forming. Compared with the prior art, the method for preparing the single crystal blades based on double-induction directional recrystallization of the ultrafine nickel powder area has the advantages that alloying and recrystallization are completed at a time, the recrystallization process is easy to control, the single crystal finished product rate is high, mechanical performance of products is high, the production cost is high, a mould shell and a mold core are not needed, and waste is not generated in crystal guiding and selecting sections.

Description

technical field [0001] The invention belongs to the technical field of aerospace materials, and in particular relates to a nickel-based high-temperature single crystal blade material prepared by using ultrafine single crystal or polycrystalline nickel powder and a preparation method thereof. Background technique [0002] The single crystal blade is a blade developed based on directional solidification technology that completely eliminates the grain boundary texture along the direction of the blade body. As the core component of a high thrust-to-weight ratio aeroengine, it must have excellent high temperature creep resistance, thermomechanical fatigue resistance, oxidation corrosion resistance and high temperature bearing capacity. It is also an important symbol to measure the advanced level of a type of engine. At present, the turbine blades of aero-engines generally adopt a single-crystal hollow structure with composite film cooling, which has complex structural shapes, low...

AI Technical Summary

Problems solved by technology

All methods of preparing single crystal blades through master alloy smelting, and then investment casting and directed solidification have the dimensional accuracy of single crystal blades and the quality of single crystal blades are greatly affected by the mold shell and core, and the temperature gradient and temperature field The distribution of the product is not easy to control, which leads to various defects in the product and the low yield of the product

In addition, since the mold shell is a one-time use, the use of the crystallizer has seeding, crystal selection, and waste in the transition section, resulting in very expensive prices for single crystal blades