A γ′-phase-strengthened cobalt-based superalloy with excellent high-temperature tensile properties

Abstract

The invention discloses a γ' phase-strengthened cobalt-based superalloy with excellent high-temperature tensile properties, belonging to the field of cobalt-based superalloys. Its composition mass percentage is: C 0.02‑0.1, Cr 5‑9, Ni 24‑28, Mo 2‑6, Ti 1‑3, Al 2.5‑5, B 0.005‑0.01, Ta 4‑8, W 2 -6, Zr 0.05-0.2, Co is the balance. The density of the γ' phase-strengthened cobalt-based superalloy with excellent high-temperature tensile properties of the present invention has obvious advantages over traditional Co-Al-W ternary system alloys. The alloy of the present invention has higher high-temperature strength and certain high-temperature plasticity than the advanced polycrystalline nickel-based superalloy Mar-M247 in the temperature range of 800°C-900°C, and the alloy of the present invention has no obvious yield abnormality in the temperature range of room temperature to 800°C And medium temperature brittleness, which ensures the safety and stability of the alloy during use. In addition, the high temperature oxidation resistance of the alloy of the present invention within 200 hours below 900°C belongs to the level of complete oxidation resistance. Finally, the alloys of the present invention are suitable for aeroengine and industrial gas turbine gas turbine blade alloy materials.

Description

technical field [0001] The invention belongs to the field of cobalt-based superalloys, in particular to a gamma prime phase-strengthened cobalt-based superalloy with excellent high-temperature tensile properties. Background technique [0002] Cobalt-based superalloys have attracted much attention for their excellent thermal fatigue resistance, hot corrosion resistance, oxidation resistance and high structural stability. However, traditional cobalt-based superalloys rely on carbide strengthening, lack of effective strengthening phase, and their high-temperature strength is low. They are often used as alloy materials for turbine engines and gas turbine guide vanes. [0003] γ′-Co 3 The discovery of (Al,W) phase makes up for this deficiency, and this phase has long-term structural stability at 900 °C, which significantly improves the high-temperature performance of cobalt-based superalloys. This means that cobalt-based superalloys can replace nickel-based superalloys as alloy...

AI Technical Summary

Problems solved by technology

At present, the main problems faced by γ′ phase strengthened cobalt-based superalloys are insufficient high-temperature strength and high-temperature plasticity.

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