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200 4. (12 pts) The figure below shows the Stress (logarithmic scale) versus steady-state creep rate (logarithmic scale) for an S-590 alloy at four temperatures. A specimen 750 mm long of an S-590 alloy is to be exposed to a tensile stress of 300 MPa at 650°C for 500 hours. a) At a tensile stress of 1000 300 MPa at 650°C, what 800 is the steady-state creep 600 650°C rate? 400 b) Assume that the total 730°C of both instantaneous and primary creep elongations is 1.5 mm 100 925°C After exposed to a tensile stress of 300 MPa at 650°C for 500 hours, 40 determine the total length of the S-590 specimen 10-6 105 104 103 102 10-1 1 10 102 103 Steady-state creep rate (nl) Stress (MPa) 8150 a 80 60 اس اس اس اس اس اس اس اسلام2