A Novel Wrought Ni-Based Superalloy with High-Temperature Strength, Resistance to Creep Rupture, and Resistance to Oxidation

ATI 273ATI 273™ alloy was developed to be a fabricable, creepCreep-resistant, and oxidationOxidation-resistant superalloySuperalloys. This paper summarizes material characterization of early vacuum-melted lab heats focusing primarily on its oxidationOxidation resistance, though high-temperatureHigh temperature oxidation strength properties will also be addressed. Short- and long-term continuous isothermal exposure data for 871 and 982 °C testing in dry air will be presented with an emphasis on understanding the impact of Ta addition on scale formation. Furthermore, cyclic exposure testing in flowing air was carried out to assess oxide scale adhesion and healing. ATI 273ATI 273 has an intentional tantalumTantalum addition of 2.5 wt.%, and this impactful element increases the alloy’s resistance to both oxidationOxidation and creepCreep. This paper will show the alloy’s improved properties are linked to Ta addition and Ti reduction in the chemistry leading to improved properties compared to ATI 263™ and Haynes® 282® alloys. ATI 273ATI 273 is being considered for high temperatureHigh temperature structural applications, especially those for land-based gas turbine and aerospace engines.