High-thermal-stability high-strength Re-free nickel-based single-crystal high-temperature alloy and preparation process thereof

Abstract

The invention provides a high-thermal-stability high-strength Re-free nickel-based single-crystal high-temperature alloy and a preparation process thereof, and belongs to the field of nickel-based single-crystal high-temperature alloys. The alloy comprises the following chemical components of, in percentage by weight (wt.%), 7.1%-11% of Cr, 7.5%-14% of Co, 0.5%-3% of Mo, 7%-10% of W, 4.5%-7% of Al, 5%-9% of Ta, 0.5%-3% of Ti and the balance Ni. The alloy has excellent heat stability, high-temperature strength, oxidation resistance and cold and hot fatigue performance, the mechanical property of the alloy is still kept at a high level after heat exposure at high temperature for a long-time, the alloy does not contain a noble metal element Re, the durability of the alloy is equivalent to that of a typical Rene N5 alloy containing 3% of Re, and the cost is reduced by 50% or above. The alloy is particularly suitable for manufacturing long-service-life and high-reliability hot-end high-temperature components in the fields of aviation, aerospace, energy and the like.

Description

technical field [0001] The invention relates to the technical field of nickel-based single-crystal superalloys, in particular to a high-thermal-stability, high-strength Re-free nickel-based single-crystal superalloy and its preparation process. The prepared alloy is mainly suitable for long-term exposure to high stress at high temperatures. Hot-end high-temperature components in aviation, aerospace, energy and other fields, such as turbine blades and guide vanes of aero-engines. Background technique [0002] With the development of aviation, aerospace, energy and other industrial fields, the requirements for the temperature bearing capacity of superalloy materials are also constantly increasing. In order to meet the needs of advanced equipment power propulsion systems, superalloys have undergone several development processes from equiaxed crystals to oriented columnar crystals and single crystals, and their temperature bearing capacity has been significantly improved. Since...

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Problems solved by technology

[0003] In order to solve the problems of poor high-temperature structure stability, low strength, and high cost of nickel-based single crystal superalloys in the prior art, the purpose of the present invention is to provide a high thermal stability, high strength, Re-free nickel-based single crystal superalloy and its preparation process. The alloy has excellent medium and high temperature strength, high structural thermal stability, strong oxidation resistance, and does not contain precious metal elements Re, and its durability performance is equivalent to that of a typical Rene N5 alloy containing 3wt.% Re, but the cost is reduced by 50% above

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