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...

AI Technical Summary

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 are easily precipitated.

Re resources in our country are very limited. Once a large amount of Re-containing alloys are used, the price of Re will soon rise, the supply will be tight, and the resources will be exhausted.

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