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a) y-face c) x-face 500 microns Figure 4-2. Low magnification micrograph of the coarse, elongated microstructure of MA 754 in the as-received condition. Subtask 3-1-2 High Temperature Mechanical and Creep Properties of Coarse-grained MA 754 - The tensile properties (strain rate ~ 1 x 10-3/second) of coarse-grained MA 754 were determined for temperatures expected to be present in the proposed supercritical CO2 Brayton cycle and are shown in Figure 4-3 for both the longitudinal and transverse directions. These values are significantly greater than those of Inconel 617 at similar temperatures [Special Metals Corporation, 2005]. At 1000oC, the yield and ultimate tensile stress of MA 754, regardless of orientation, are more than 2 times that of I-617. In this regard, the use of MA 754 represents a significant advantage, allowing components with thinner walls (and less material) to be designed and fabricated. However, the ductility at 1000oC for MA 754 is only ~17% in the longitudinal direction and ~10% in the transverse direction, Fig. 4-3b, as opposed to >70% for I-617 [Special Metals Corporation, 2005]. In this regard, MA 754 may have fabrication issues. In general, fracture surface morphology was determined by the elongated microstructures with tensile samples oriented in the longitudinal direction exhibiting ductile transgranular rupture and transverse samples exhibiting intergranular failure, Fig. 4-4, i.e. fracture along the elongated grain boundaries. b) z-face z-face y-face x-face Extrusion direction (Longitudinal) 56PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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