Control method for grains of directional column crystals in process of preparing large-size directional blade by LMC directional solidification technique

Abstract

The invention discloses a control method for grains of directional column crystals in a process of preparing a large size directional blade by an LMC directional solidification technique, and belongsto the technical field of casting of large-size directional column crystal blades. According to the method, when the blade is prepared by the LMC directional solidification technology, a water-coolingcopper disc is used as a crystallizer, the crystallizer is coated with a heat insulation coating, the crystallizer can be protected against corrosion reaction through the coating, and a low-melting-point metal is prevented from being solidified and adhered in a large amount. According to the method, initial grains of the blade can be increased, and the solid-liquid interface form can be improved,so that the quantity and width of the grains of the large-size directional blade meet related technical requirements.

Description

technical field [0001] The invention relates to the technical field of casting of large-size oriented columnar blades, in particular to a method for controlling oriented columnar grains in the process of preparing large-sized oriented blades using LMC directional solidification technology. Background technique [0002] Gas turbine is the core power equipment of military / civilian aircraft and surface ships, and has a long-term, overall and irreplaceable strategic position in the sustainable development of the energy and power industry. The design and manufacturing technology of the hot end parts of the gas turbine belongs to the key core foundation of the gas turbine, and it is a key technology that must be overcome in the development of a gas turbine with independent intellectual property rights. At present, the manufacturing technology of hot-end components for reburning is still in the hands of foreign companies. Foreign technology blockade and price monopoly on these core...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that the number of grains is too small or the width of the grains is too large when the LMC method is used to prepare large-size oriented columnar blades in the prior art, the present invention provides a process for preparing large-sized oriented blades using LMC directional solidification technology. The columnar crystal grain control method, through improving the LMC method crystallizer, optimizing the directional solidification process, etc., increases the initial grain of the blade and improves the shape of the solid-liquid interface, so that the number and width of large-sized directional blade grains meet the relevant technical requirements

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