Precise casting module and casting method for preparing nickel base single crystal guide blade with precisely controllable crystal orientation by using precise casting module

Abstract

The invention discloses a precise casting module and a casting method for preparing a nickel base single crystal guide blade with precisely controllable crystal orientation by using the precise casting module. According to the precise casting method, a specific group tree structure is used for combining a seed crystal method and a crystal guide method; a nickel base single crystal high temperaturealloy guide blade prepared by the method can realize the precise control on the crystal orientation; high crystal grain completeness is obtained. Firstly, a Raul method is used for detecting the crystal orientation of a nickel base single crystal high temperature alloy test block; a line cutting machine or other similar methods are used for preparing single crystal seed crystal blocks with the crystal orientation requirements; then, a sprue cup, a casting system, a cast piece wax mold, a bottom plate and the like are combined from top to bottom by the group tree method disclosed by the invention to be made into a wax mold module; ceramic fire-resistant slurry coats the outer surface of the module in a hanging way to form a ceramic mold case; a cast piece is prepared through the processesof dewaxing, roasting, seed crystal installation and casting. The method provided by the invention has the advantages that the crystal orientation can be precisely controlled to be within 5 DEG; the crystal grain completeness of the cast piece can be improved; the performance and the casting qualification rate of the single crystal guide blade can be improved.

Description

technical field [0001] The invention mainly relates to the field of precision casting, in particular to a precision casting method for a nickel-based single crystal superalloy guide vane (referred to as a single crystal guide vane in the present invention) with precisely controlled crystal orientation. Background technique [0002] With the continuous improvement of the thrust-to-weight ratio and work efficiency requirements of aero-engines, the temperature in front of the turbines of aero-engines also continues to increase, even reaching high temperatures above 1550°C. Ordinary superalloy blades with equiaxed grain structure are difficult to serve in this working condition. Single crystal superalloys have been used more and more because of their advantages such as high melting point, high temperature strength and excellent creep resistance. But it is worth noting that: 1. Single crystal parts have obvious anisotropy, and the performance is the best when the <001> ori...

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This also greatly limits the development of my country's aero-engines

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