Directional columnar grain control method in the process of preparing large-size directional blades by using LMC directional solidification technology
A technology of directional solidification and control method, used in manufacturing tools, casting equipment, metal processing equipment, etc., can solve problems such as too few grains and too large grain width, and achieve the effect of avoiding grain growth defects
Active Publication Date: 2022-03-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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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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Embodiment 1
[0025] The invention is used to prepare large-size oriented columnar blades with a length of 300 mm.
[0026] The above-mentioned crystallizer coated with heat-insulating paint is used to prevent the crystallizer from reacting with the low-melting point metal tin after entering the low-melting point molten pool during the directional solidification process, and its heat insulation effect can imitate the solidification of low-melting point metals. Place the large-size oriented columnar crystal blade shell on the crystallizer and fix it, then lift it into the holding furnace of the LMC equipment. The drawing rate of ~15mm / min is drawn into the low melting point metal molten pool at the lower part of the holding furnace to realize the directional solidification of the blade. During the whole blade preparation process, there is circulating cooling water inside the crystallizer for cooling. Utilize the large-size oriented columnar blades prepared by the present invention such as ...
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Abstract
The invention discloses a method for controlling oriented columnar crystal grains in the process of preparing large-sized oriented columnar blades by using LMC directional solidification technology, and belongs to the casting technical field of large-sized oriented columnar crystal blades. The method is to use a water-cooled copper plate as a crystallizer when using LMC directional solidification technology to prepare blades. Extensive coagulation and adhesion occurred. The method of the invention can increase the initial crystal grains of the blade and improve the shape of the solid-liquid interface, so that the quantity and width of the large-sized directional blade crystal grains meet the relevant 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...
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IPC IPC(8): B22D27/04B22D11/055B22C3/00B22D11/18
CPCB22D27/045B22D11/055B22C3/00B22D11/18
Inventor 申健卢玉章张功郑伟李辉董加胜楼琅洪张健
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI