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3-21. Schematic of the combined cycle. ................................................................................................. 45 3-22. HYSYS diagram of Brayton top cycle with CO2 working fluid. .................................................. 49 3-23. T-S diagram of Brayton top cycle with CO2 working fluid. ......................................................... 50 3-24. Parametric study of the effects of reactor outlet temperature on combined cycle efficiency. ...................................................................................................................................... 52 3-25. Parametric study of the effects of secondary mass flow rate on combined cycle efficiency. ........ 52 3-26. Parametric study of the effects of working pressure on combined cycle efficiency...................... 53 4-1. Initial microstructures of a) coarse, elongated-grained and b) fine, equiaxed-grained MA 754. ......................................................................................................................................... 55 4-2. Low magnification micrograph of the coarse, elongated microstructure of MA 754 in the as-received condition. .................................................................................................................... 56 4-3. Elevated temperature mechanical properties, a) yield and ultimate stress and b) ductility and reduction in area, of coarse-grained MA 754.......................................................................... 57 4-4. Tensile fracture surfaces of MA 754 samples oriented parallel to (left) and perpendicular to (right) the extrusion direction, longitudinal and transverse, respectively. ................................. 57 4-5. Comparison of the stress rupture data for MA 754 with other high temperature alloys................ 61 4-6. Elevated temperature yield and ultimate strength (left) and ductility and reduction in area (right) for fine-grained MA 754. Dashed curves show the elevated temperature properties of coarse-grained MA 754 (Recrystallized)................................................................................... 62 4-7. Minimum creep rates for fine-grained MA 754 as function of temperature. Lines representing coarse-grained data (Recrystallized) are shown for comparison............................... 63 4-8. Stress-rupture behavior of fine-grained MA 754 as a function of temperature. Lines representing coarse-grained data (Recrystallized) are shown for comparison............................... 63 4-9. Metallographic cross-sections of creep specimens: (a) specimen F-T-19 tested at 1000°C and 10 MPa, elongation 24% (prior to failure); (b) specimen F-T-14 tested at 900°C and 25 MPa, failure elongation 2.4%. .................................................................................................. 64 4-10. Schematic of the multi-sample supercritical CO2 corrosion testing system.................................. 65 4-11. Schematic of second CO2 corrosion system utilizing the sample in a form of a pipe. The sample acted as the pressure boundary. ......................................................................................... 66 4-12. Corrosion rates of coarse-grained MA 754 in supercritical CO2 at 1000oC and 10 MPa as a function of exposure time. The corrosion rate for fine grained MA 754 is shown as a blue triangle. .................................................................................................................................. 67 xiiiPDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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