From Equation 9.20, if the logarithm of is plotted versus the logarithm of εs, then a stra...

From Equation 9.20, if the logarithm of is plotted versus the logarithm of εs, then a straight line should result, the slope of which is the stress exponent n. Using Figure 9.38, determine the value of n for the S-590 alloy at 925°C and for the initial (i.e., lower-temperature) straight-line segments at each of 650°C, 730°C, and 815°C.

Figure 9.38 Stress (logarithmic scale) versus steady-state creep rate (logarithmic scale) for an S-590 alloy at four temperatures.

 (9.20)