Abstract
In order to evaluate the long-term thermal stability of Thermo-Span® alloy—an age-hardenable, Fe-Co-Ni-based superalloy—heat-treated samples were exposed for 1,500 hours at temperatures ranging from 480°C to 675°C. Evaluations included tensile tests at room temperature, 595°C, and 650°C; stress-rupture tests at 675°C; and post-creep tensile tests at 620°C. The results showed that Thermo-Span alloy exhibits stable tensile properties and microstructure after 1,500 hour exposures at temperatures within the range of 480°C to 675°C. No embrittlement occurred at any temperature. Exposure at 675°C did not degrade stress-rupture properties. Neither stressed nor unstressed exposures at 620°C had a significant effect on tensile properties at 620°C.
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