(a) Estimate the activation energy for creep (i.e., Qc in

(a) Estimate the activation energy for creep (i.e., Qc in

(a) Estimate the activation energy for creep (i.e., Qc in Equation 8.20) for the S-590 alloy having the steady-state creep behavior shown in figure. Use data taken at a stress level of 300MPa (43,500psi) and temperatures of 650째C and 730째C. Assume that the stress exponent n is independent of temperature.
(b) Estimate eYS at 600째C (873 K) and300MPa.