A high-strength niobium-silicon single crystal alloy
A technology of silicon alloy and niobium alloy, which is applied in the field of high-strength niobium-silicon single crystal alloy, can solve the problems of high-temperature durability and other issues that need to be further improved, and achieve the effect of excellent room temperature toughness
Active Publication Date: 2017-08-25
AECC COMML AIRCRAFT ENGINE CO LTD
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Problems solved by technology
GE Company of the United States has developed RMIC niobium-silicon alloy (US patent US6419765). The RMIC niobium-silicon alloy prepared by directional solidification process has good comprehensive mechanical properties, but the high-temperature durability performance needs to be further improved.
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[0045] According to the scope of chemical composition of the present invention, choose 4 typical compositions, represent as NG1, NG2, NG3, NG4 (see Table 1) respectively. First, vacuum induction melting is used to cast a master alloy with a chemical composition that meets the requirements, and then a niobium-silicon single crystal test rod is grown by a spiral crystal selection method, and then the fracture toughness and durability performance at room temperature are tested after mechanical processing. Among them, the cross-sectional microstructure photos and longitudinal cross-sectional microstructure photographs of the single crystal alloy numbered NG1 are as follows: figure 1 and figure 2 shown.
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The invention provides niobium-silicon alloy composed of Nb, Si, Ti, Cr, Hf, Ta, Mo, W, Re, B, Y and other elements. The niobium-silicon alloy is single crystal alloy, has excellent room temperature toughness, high-temperature strength, high-temperature durability and high-temperature oxidation resistance, can be used in the environment of high temperature and high stress and is suitable for manufacturing of parts, such as turbine blades of aero-engines, for bearing high stress at high temperature.
Description
technical field [0001] The invention belongs to the field of high-temperature structural materials, and specifically relates to a high-strength niobium-silicon single crystal alloy, which is mainly suitable for parts subjected to high stress at high temperature, such as turbine blades of aeroengines. Background technique [0002] Turbine engines are used in power systems such as aviation, ground, and ships. The hot-end components work under conditions of high temperature, high pressure, and high stress. Therefore, strict requirements are placed on materials. Strength, durability and creep strength, oxidation resistance, fatigue properties, and room temperature ductility. [0003] The most widely used turbine blade material is nickel-based single crystal superalloy. With the improvement of the performance of the turbine engine, the temperature of the turbine inlet gradually increases, and the requirement for the working temperature of the turbine blade material is also highe...
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IPC IPC(8): C22C27/02C22C30/00C30B29/52F01D5/28
Inventor 李玉龙
Owner AECC COMML AIRCRAFT ENGINE CO LTD