The following steady-state stage II creep rates were recorded for a nickelbase superalloy at a constant tensile stress of 200 MPa.
It is known that the exponent of the stress in the creep-rate equation is n = 5.
(a) What would be the total stage II creep strain for this alloy at 913 K and a tensile stress of 200 MPa. in 1 year of service?
(b) Predict the stage II creep rate of this alloy at 891 K and a tensile stress of 300 MPa.
(c) Determine the enthalpy of activation for creep in eV/atom for this alloy.
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