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Q5 (25 pt). For the given creep rapture data on the left, one can construct the Larson-Miller plot on the right. Please answer the below
Q5 (25 pt). For the given creep rapture data on the left, one can construct the Larson-Miller plot on the right. Please answer the below questions. 1000 100 Temp. (C) 650 650 650 650 650 650 650 705 705 705 705 760 760 760 760 Stress (MPa) 480 480 480 450 380 345 310 310 310 240 205 205 205 170 140 Rupture Time (hr) 22 40 65 75 210 2700 3500 275 190 960 2050 180 450 730 2150 Temp. (C) 815 815 815 815 815 815 815 815 815 815 870 870 870 870 980 1095 Stress (MPa) 140 140 140 120 120 105 105 105 105 85 83 83 69 42 21 10 Rupture Time (hr) 29 45 65 90 115 260 360 1000 700 2500 37 55 140 3200 440 155 Stress (MPa) 10 1 18 32 20 22 24 26 28 30 Larson-Miller Parameter (1000K) a. What is the corresponding data for the red dot in the figure on right? (Temperature, Stress and Rapture time). Please provide your reasoning. b. Calculate the maximum service temperature so that creep failure will not occur in 5000hr at stress levels of 180 MPa. c. If the Larson-Miller parameter for a given elevated temperature alloy was found to be 26,000, by how much would the rupture life of a sample be estimated to decrease if the absolute temperature of the test were increased from 820 to 950C? Assume that the Larson-Miller constant is equal to 20
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