Abstract
High temperature tensile properties of two nickel-based superalloys, Alloy 740H and Alloy 617, were investigated for evaluating its reliability as a component material of advanced ultrasupercritical (A-USC) power plants. Tensile tests with various strain rates were conducted at 700 °C and 800 °C, and effects of the strain rate and temperature on tensile property were discussed. In addition, influence of the notch on tensile deformation and fracture was presented using circumferential notched specimen.
