For a cylindrical S-590 alloy specimen (Figure 8.31) originally 10 mm (0.40 in.) in diameter and 500 mm (20 in.) long, what tensile load is necessary to produce a total elongation of 145 mm (5.7 in.) after 2,000 h at 730C (1350F)? Assume that the sum of instantaneous and primary creep elongations is 8.6 mm (0.34 in.). Stres (MP 8888 1000 800 600 650 400 7300 200 100 8 888 60 40 20 L 10 10 10 10 10 10 Steady-state creep rate they 1 10 102 10