Nickel-cobalt-based high-temperature alloy with favorable structure stability and easiness for processing

Abstract

The invention belongs to the field of nickel-based high-temperature alloys, and particularly discloses a nickel-cobalt-based high-temperature alloy with favorable structure stability (no Ni3Ti phase separation) and easiness for processing. The nickel-cobalt-based high-temperature alloy can be processed by using a casting and forging (C and W) process and a powder metallurgy process and is mainly suitable for bearing parts with high stress at the high temperature of 750DEG C, such as a turbine disc and a blade material in an aeroengine. The nickel-cobalt-based high-temperature alloy comprises the following chemical components in percentage by weight: 0.1-10 percent of Ru, 22-35 percent of Co, 10-20 percent of Cr, 0.10-5 percent of Ta, 0.10-5 percent of W, 0.10-5 percent of Mo, 3-10 percent of Ti, 0.2-5 percent of Al, 0.01-0.10 percent of Zr, 0.10-1 percent of V, 0.10-5 percent of Nb, 0.1-2 percent of Hf, 0.005-0.15 percent of C, 0-2 percent of Fe, 0.01-0.1 percent of Mg, 0.05-0.50 percent of Mn, 0.005-0.1 percent of B and the balance Ni. According to the nickel-cobalt-based high-temperature alloy disclosed by the invention, the Ru element is added under the existence of a TMW alloy containing Co and Ti with high contents; and under the condition that the high temperature bearing capacity of the alloy is ensured, the structure stability (no Ni3Ti phase separation) and the processability of the alloy can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of nickel-based high-temperature alloys, and is specifically a kind of alloy with good structural stability (Ni-free alloy) 3 Ti phase precipitation), easy-to-process nickel-cobalt-based superalloy, the alloy can be processed by casting + forging (C&W) process and powder metallurgy process, mainly suitable for high-stress components at high temperature (750 ° C), such as aviation Turbine disk and blade material in engines. Background technique [0002] With the continuous improvement of engine performance, the operating temperature and stress of turbine components are getting higher and higher, and the temperature bearing requirements for turbine disk materials are also getting higher and higher. Judging from the current research progress, using low-cost manufacturing technology to develop turbine disc alloys with higher service temperature, low crack growth rate, high strength and good process performance will be th...

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Problems solved by technology

The η phase mainly exists in the TMW alloy in the form of lamellar or massive, and the formed η phase will reduce the hot workability of the alloy

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