Question 8
The creep behavior of nickel-base superalloys that are used for jet turbine applications can be described by the equation of
de = Coe^(-Q/RT) ip
where C = 6.50 × 10^(-10) hour; Q = 320 kJ/mol; R = 8.314 J/molK; T is the absolute temperature, K; σ is the applied stress, MPa.
i. Determine the creep rate at 925°C and 350 MPa.
ii. What would the creep rate be if the stress was increased by 27 MPa?
iii. What would the creep rate be if the temperature was increased by 27°C?
[7 marks]