Gamma'-Ni3Al-based low-cost high-temperature alloy reinforced by precipitation of high-content square nano particles and preparation method

Abstract

The invention provides a gamma'-Ni3Al-based low-cost high-temperature alloy reinforced by precipitation of high-content square nano particles and a preparation method. The gamma'-Ni3Al-based low-cost high-temperature alloy reinforced by precipitation of the high-content square nano particles comprises Ni, Co, Al, Ta, Ti, Nb, Cr, Mo and W elements. The alloy comprises the following elements in percentage by mass (wt.%): 0.5 to 12.6 percent of Co, 5.5 to 5.8 percent of Al, 3.0 to 3.3 percent of Ta, 0.8 to 0.9 percent of Ti, 1.5 to 1.7 percent of Nb, 2.5 to 5.6 percent of Cr, 2.5 to 5.1 percent of Mo, 4.9 to 9.7 percent of W and the balance of Ni. According to the gamma'-Ni3Al-based low-cost high-temperature alloy reinforced by precipitation of the high-content square nano particles and the preparation method provided by the invention, through alloy component design, coherent precipitation of ordered gamma'-Ni3 (Al, Ta, Ti and Nb) nanoparticles in a cubic form on an FCC-gamma matrix is achieved, the volume percentage content of the gamma' nano particles is higher than 75 percent, obvious coarsening does not occur after long-term aging at 850 to 900 DEG C, and the high-temperature structure stability is high, so that the alloy has excellent high-temperature mechanical properties, high-temperature oxidation resistance and corrosion resistance; and meanwhile, the series of gamma'-Ni3Al-based high-temperature alloy does not adopt expensive elements such as Ru and Re, the preparation process is simple, the material cost is greatly reduced, and the gamma'-Ni3Al-based high-temperature alloy is a novel Ni-Co-based high-temperature alloy.

Description

technical field [0001] The invention belongs to the field of Ni-Co-based high-temperature alloys, and relates to a γ′-Ni with high content of square nanoparticle precipitation strengthening 3 Al-based low-cost superalloy and its preparation method. Background technique [0002] With the development of aerospace technology, engines put forward higher requirements on the service performance of materials. Therefore, it is more urgent to design superalloys with better properties. The series of Ni-based superalloys currently developed are usually added with more than ten alloying elements such as Al, Ti, Ta, Nb, Cr, W, Mo, Re, Ru, etc., in order to ensure the square γ′(L1 2 -Ni 3 Al structure) nanoparticles are coherently precipitated on the FCC-γ matrix, so that the alloy still has sufficiently high high-temperature strength, excellent oxidation and corrosion resistance, and good high-temperature structural stability in high-temperature extreme environments. It should be poi...

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Problems solved by technology

[0003] Therefore, there are three core issues restricting the development of the current Ni-based superalloys: on the one hand, there are many Ni-based superalloying elements, and the structure and properties are sensitive to the alloy composition, that is, the addition type and amount of each alloying element will affect the alloy. performance, it is difficult to use the traditional alloy design method to achieve the optimal match between the alloying elements; on the one hand, the addition of a large amount of expensive Re and Ru and other refractory elements increases the cost of the alloy; The precipitation of γ′ nanoparticles in superalloys can be further increased to improve their high-temperature mechanical properties

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