A kind of superalloy casting and preparation method thereof

Abstract

The invention belongs to the field of high-temperature alloy metal materials and relates to a high-temperature alloy casting for a hot-end part of a gas turbine engine and a preparation method of thehigh-temperature alloy casting. The alloy is prepared from the following chemical components in percentage by mass: 3.5 percent to 7.5 percent of Cr, 1.0 percent to 4.0 percent of Mo, 4.5 percent to 8.5 percent of W, 0 percent to 4.0 percent of Re, 4.0 percent to 8.0 percent of Ta, 4.0 percent to 7.0 percent of Al, 6.8 percent to 9.2 percent of Co, 0 percent to 2.0 percent of Ti, 0 percent to 0.05percent of C, 0 percent to 0.04 percent of B, 0 percent to 0.4 percent of Hf, 0 percent to 1 percent of Nb and the balance of Ni. By controlling the mass percent ratio of the Cr and the Mo and regulating the ratio of a W element and (B and Hf) elements, the high-temperature lasting service life, the high-temperature gas heat corrosion resisting performance, the casting technology performance andthe tolerance of small-angle crystal boundary defects are improved. The alloy provided by the invention is suitable for manufacturing a worm wheel working blade and a guide blade of the gas turbine engine.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy metal materials, and relates to a high-temperature alloy casting used for gas turbine hot-end components and a preparation method thereof, in particular to a heat-resistant corrosion-resistant long-life superalloy used for manufacturing gas turbine turbine working blades and guide blades . Background technique [0002] With the development of natural gas resources in my country and the increasing demand for energy conservation, environmental protection, and sustainable economic and social development, gas turbines, which have the advantages of small size, high efficiency, low pollution, and wide power range, compared with traditional power plants such as diesel engines and steam turbines, are being used. Widely used in industrial power generation, ship power, oil and natural gas transmission and other fields. [0003] With the increase of gas turbine thermal efficiency, output power and turbi...

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Problems solved by technology

[0004] In order to improve the temperature bearing capacity and high-temperature creep durability of the alloy, the content of refractory elements such as rhenium, tungsten, molybdenum, and tantalum in the alloy is continuously increasing. However, increasing the content of refractory elements can improve the temperature bearing capacity of the alloy and increase the creep durability At the same time, it is easy to promote the precipitation of harmful phases such as brittle TCP during service, thereby destroying the stability of the high-temperature long-term aging structure of the alloy and deteriorating the creep durability of the alloy.

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