HAYNES 233 alloy – a new fabricable, precipitation-hardenable, alumina-forming high temperature alloy

HAYNES^® 233^® alloy is a new Ni-Co-Cr-Mo-Al alloy that offers excellent oxidation resistance at temperatures to 2100°F (1149°C) or higher, depending on application, coupled with superior creep strength. The alloy obtains its exceptional oxidation resistance through the formation of a protective alumina layer, while the high creep strength is a result of solid-solution and carbide strengthening. Additionally, for use at low to intermediate temperature applications (below the gamma-prime solvus of 1767°F (964°C)), the alloy can be age-hardened by heat treatment to produce even greater strength. Finally, the alloy can be readily fabricated using conventional methods as well as additive manufacturing since it exhibits good hot workability, cold formability, and weldability. Potential applications include hot gas path components in aerospace and industrial gas turbines, industrial heating fixtures and sensors, various structural components in the emerging energy and chemical process markets. The present work aims to elucidate the high- and intermediate-temperature capabilities of HAYNES^® 233^® alloy in terms of oxidation resistance, tensile strength, creep-rupture life, physical properties, and other relevant properties and compare them with established alloy systems.