Co-based alloy

Abstract

A Co-based alloy containing not less than 0.001 mass% and less than 0.100 mass% of C, not less than 9.0 mass% and less than 20.0 mass% of Cr, not less than 2.0 mass% and less than 5.0 mass% of Al, not less than 13.0 mass% and less than 20.0 mass% of W, and not less than 39.0 mass% and less than 55.0 mass% of Ni, with the remainder being made up by Co and unavoidable impurities, wherein the contents of Mo, Nb, Ti and Ta which are included in the unavoidable impurities are as follows: Mo < 0.010 mass%, Nb < 0.010 mass%, Ti < 0.010 mass%, and Ta < 0.010 mass%.

Description

technical field [0001] The present invention relates to various parts requiring high strength in high-temperature environments such as steam turbine parts, aircraft engine parts, chemical plant parts, automobile engine parts, high-temperature furnace parts, etc., especially Co-based alloys suitable for forging. Background technique [0002] Ni-based alloys, Co-based alloys, Fe-based alloys, and the like are known as superalloys used in high-temperature environments. Ni-based alloys are based on L1 2 Structured γ′ phase (Ni 3 (Al, Ti)) precipitation-strengthened alloys show an inverse temperature dependence in which the strength becomes stronger as the temperature rises. In addition, it is also excellent in high-temperature characteristics such as heat resistance, corrosion resistance, oxidation resistance, and creep resistance. For this reason, Ni-based alloys are used in various applications requiring high strength under high-temperature environments. However, Ni-based ...

AI Technical Summary

Problems solved by technology

However, for existing alloys, the high temperature strength characteristics are not necessarily sufficient

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