Seed crystal preparation process for engineering application of growing of single crystal blades via seed crystal method

Abstract

The invention relates to a seed crystal preparation process for engineering application of growing of single crystal blades via a seed crystal method, belonging to the technical field of high-temperature alloy precision casting. The method comprises the following steps that S1, selection of raw materials: specifically, selecting single-crystal high-temperature alloy; S2, preparation of a seed crystal test bar: S21, performing crystal selection on the single-crystal high-temperature alloy selected in the step S1 to obtain a large-diameter single-crystal test bar, and cutting the large-diameter single-crystal test bar by using the single-crystal test bar to prepare a target oriented seed crystal; S22, combining the target orientated seed crystal in the step S21 with a wax mold test bar, and performing directional solidification to obtain a seed crystal test bar; and S23, carrying out heat treatment on the seed crystal test bar in the step S22, and then carrying out macroscopic corrosion and single crystal integrity inspection on the seed crystal test bar to obtain the seed crystal test bar; and S3, cutting and preparation of a seed crystal. The process is simple to operate and convenient to manufacture; the orientation of the seed crystal test bar only needs to be detected twice, and cutting only needs to be conducted once; and moreover, cutting equipment is simple and high in precision, cutting efficiency is greatly improved, and the requirement of batch production is met.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy precision casting, and in particular relates to a seed crystal preparation process for the engineering application of a single crystal blade grown by a seed crystal method. Background technique [0002] The importance of single crystal superalloys in the fields of aeroengines and gas turbines is becoming more and more prominent. When casting single crystal blades, the grain boundaries of the blades are eliminated, the source of cracks in the blades is fundamentally removed, and the durability of the blades is greatly improved. Life, creep performance and thermal fatigue resistance further improve the performance of aero-engines. Due to the severe anisotropy of superalloys, there is a certain angle deviation in the crystal orientation away from the stacking axis, resulting in several times or even hundreds of times in the creep and fatigue life of the blade. Impact research is of gr...

AI Technical Summary

Problems solved by technology

[0004] In the disclosed seed crystal preparation method, there are disadvantages such as cumbersome operation process, high cost of special fixtures, low production efficiency and high production cost, which are not suitable for engineering applications

[0005] The invention with the publication number CN109916693A discloses a method for determining the orientation of a cast single crystal superalloy body, which determines the crystal orientation of a cast single crystal superalloy through the dendrite direction, but does not mention in detail the specific preparation of different orientation seeds. method

Images