5. The following creep rupture data were secured for a high alloy steel (20 percent Cr, 20 percent Ni,and 20 percent Co) for aircraft engine mounts. The Larson-Miller constant C

has been determined tobe 17.5. Plot a master life curve for the alloy, log, o vs. T(°Abs)(C+log,, t,). 6. From the master life curve formed in Problem 5, determine the maximum operating stress for a tensilemember designed to last 300,000 hrs. at 1,325°F. If the data for the point on the master life curveused in the first part were to be obtained from a 1,000 hr. creep rupture test, what would be the besttemperature?