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The utility of the strength advantage is limited, however, by poor transverse ductility. The extremely creep-brittle nature of MA 754 in the transverse orientation leads to poor defect tolerance in this direction. Ductility and defect tolerance are critical for materials that serve as pressure boundaries, particularly in systems that contain either radioactive or corrosive working fluids. Alignment of grain structures with the primary loading axis (hoop direction) in tubular forms or strengthening of grain boundaries to prevent sliding and cavitation will be critical to the successful application of ODS alloys in tubing or heat exchanger applications. While some progress has been made in the area of grain structure manipulation with Fe-base ODS alloys [Chen, et. al., 2002], considerable work is still required. 400 100 10 MA 754 "L" 617 800H 800°C Nimonic 105 MA 754 "T" 617 800H MA 754 "L" MA 754 "T" Nimonic 105 1000°C 5 10 100 1000 (a) 10000 10 100 1000 Time to Rupture (hr) (b) 10000 Figure 4-5. Comparison of the stress rupture data for MA 754 with other high temperature alloys. Subtask 3-1-3 Mechanical and Creep Properties of Fine-grained MA 754 - Gregory, et al., 1985, reported the deformation characteristics of MA 754 in a fine-grained condition, i.e. prior to the final annealing step which produces a coarse, elongated grain structure in MA 754. High elongation to failure was observed in tensile tests at a variety of strain rates at temperatures ranging from 900 to 1100°C. In consideration of these findings, we performed a series of tensile and creep-rupture tests on MA 754 in a similar fine-grained condition in the hope that increased ductility, especially in the creep regime, would be observed without an unacceptable decrease in strength. The results of elevated temperature tensile tests (strain rate ~ 1 x 10-3/second) are shown in Figure 4-6. (Mechanical properties were determined only in the transverse direction since this orientation was expected to have the lowest strength and ductility due to the alignment of the oxide inclusions perpendicular to this orientation. Therefore, mechanical properties in this direction will be design limiting.) The elevated temperature properties of coarse-grained MA 754 have been included as dashed lines in this figure for comparison. The strength of the fine-grained MA 754 quickly drops from relatively high values at room temperature (greater than coarse-grained MA 754) to low values at temperatures above 800oC (lower than coarse-grained MA 754). The fine-grained MA 754 exhibits good ductility at elevated temperatures although it does fall off at 1000oC. 61 Stress (MPa)PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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