Rhenium-free low-density high-performance nickel-based monocrystalline high-temperature alloy and heat treatment technology thereof

Abstract

The invention discloses a rhenium-free low-density high-performance nickel-based monocrystalline high-temperature alloy and a heat treatment technology thereof, and belongs to the field of nickel-based monocrystalline high-temperature alloys. The alloy comprises 6.0-8.0wt% of Cr, 8.0-10.0wt% of Co, 6.0-9.0wt% of W, 1.0-3.0wt% of Mo, 0-2wt% of Nb, 3.0-6.0wt% of Al, 1.0-3.0wt% of Ti, 1.0-5.0wt% of Ta, 0.02-0.06wt% of C, 0.001-0.003wt% of B, 0-0.02wt% of Ce, 0-0.01wt% of Y and the balance Ni. The alloy has excellent low-temperature, middle-temperature and high-temperature strength and antioxidation performances, has lasting and low-cycle fatigue behavior the same to that of a second monocrystalline high temperature alloy CMSX-4 with Re content of 3wt%, does not contain a noble element Re, reduces an alloy cost by 70% or more and reduces alloy density by about 3%.

Description

technical field [0001] The invention relates to the field of nickel-based single crystal superalloy, in particular to a rhenium-free low-density high-performance nickel-based single crystal superalloy and a heat treatment process thereof. Components, such as turbine blades of aero-engines, guide vanes, etc. Background technique [0002] The development of high thrust-to-weight ratio engines has continuously put forward higher requirements on the temperature-bearing capacity of hot-end components. The service temperature of the first-generation single-crystal superalloy is 25-30℃ higher than that of the oriented columnar superalloy; the second-generation single-crystal superalloy (CMSX-4, ReneN5, etc.) is due to the addition of about 3wt. ), which is 30°C higher than that of the first-generation single-crystal superalloy; the Re content in the third-generation single-crystal superalloy is about 6wt.%, which can further increase the temperature resistance by 30°C to about 115...

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Problems solved by technology

However, while the temperature bearing capacity of the alloy is improved, its cost and density are also significantly increased, and the structure stability of the Re-containing alloy is poor, and harmful TCP phases a

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