800°C, the observed creep rate is 1.0x10^(-6) sec^(-1). Predict the creep rate at a service temperature of 600°C at this stress level. When the experiment is performed with stress two times higher and temperature of 800°C, the creep rate is doubled. Answer the following.
12. The activation energy for steady state creep in units of k (Boltzmann constant) is a. 6827.5k b. 2769k c. 1621.8k
13. The creep rate at 600°C for the same stress level is a. 5.5x10^(-6) b. 0.55x10^(-6) c. 0.275x10^(-6)
14. The activation energy for self diffusion is expected to be a. 6827.5k b. 2769k c. 1621.8k
15. The creep exponent, n, has a value of a. 0.5 b. 1.0 c. 2.0
16. The activation energy for creep at a higher stress is expected to be a. higher b. lower c. same