$($a$)$ Estimate the activation energy for creep $($i$.$e$.,Q_c$ in Equation $8\mathrm{.}22)$ for the $S-590$ alloy having the steady$-$state creep behavior shown in animated Figure $8\mathrm{.}33.$ Use data taken at a stress level of $300$MPa$(43,500)$ and temperatures of $650C$ and $730C.$ Assume that the stress exponent $n$ is independent of temperature.

$($b$)$ Estimate ${}_s^{}$ at $600C(873K)$ and $300$MPa.

Part $1$

Excellent!

What is $Q_c$ in $\frac{J}{m}ol?$

$Q_c=$

$\frac{J}{m}ol$

Hint

Attempts: $1$ of $3$ used

Part $2$

X Carefully review Section $8\mathrm{.}13$ and note Equation $8\mathrm{.}22.$ Use the value of $Q_c$ to find the other constant in your set of simultaneous equations. Make sure you used a consistent set of units.

If you are having difficulty with this problem, you may wish to review:

Solving Equations

Solving Simultaneous Equations

Exponents and Logarithms

Determine the value of $K_2^{\text{'}}=K_2{}^n$ in h ${?}^{-1}.$