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Terry C. Totemeier and Thomas M. Lillo, “Effect of Orientation on the Tensile and Creep Properties of Coarse-Grained INCONEL Alloy MA754”. Elevated temperature tensile and creep-rupture tests were performed on INCONEL MA754 in longitudinal and transverse orientations at temperatures from 700 to 1000°C. Due to a higher grain boundary density perpendicular to the applied stress axis, the transverse orientation was weaker and less ductile than the longitudinal orientation. This effect was especially pronounced for creep tests at 900 and 1000°C. Threshold creep behavior was observed for the longitudinal orientation with stress exponents ranging from 29 to 40. Stress exponents in the long transverse orientation ranged from 24 at 800°C to 5 at 1000°C, indicating a temperature-varying deformation mechanism. Creep ductility in the transverse direction was extremely low, less than 1 pct for higher temperature, lower stress conditions. Failure was controlled by grain boundary separation for all transverse specimens. Despite the relative weakness of the transverse orientation, MA754 maintains a clear strength advantage over other wrought alloys being considered for advanced power plants. The full paper is attached as an appendix since it gives greater detail and discussion of the results. Task 3-1-3 Mechanical and creep properties of fine-grained MA 754 Fine grained MA754 was acquired from the vendor and characterization of the microstructure was performed. Fine-grained MA754 is heat treated at high temperature to produce coarse-grained (creep resistant) MA754. Figure 20 shows a TEM micrograph of fine-grained MA754 with the grain size on the order of 0.5-1.0 m. This is in contrast to the coarse-grained MA754, which exhibited highly elongated grains on the order of millimeters in length. 1 micron Tensile and creep specimens were fabricated to investigate the high temperature mechanical strength and creep resistance of this material. The creep resistance of the fine-grained MA754 is expected to be much lower than its large-grain counterpart. However, the creep properties of fine-grain MA754 must be known since joining may have to occur while in the fine grained state and then followed by an anneal to generate large creep resistant grains. Elevated temperature tensile tests were completed on transverse specimens at 25, 800, 900, and 1000°C and a strain rate of 10-3 sec-1. The test results are listed in Table 7. The fine-grained material is stronger than the coarse-grain material at room temperature (~1275 MPa vs. 900 MPa, respectively) but considerably weaker at elevated temperature (67MPa vs. 900 MPa at 1000oC, respectively). Transverse tensile ductility at elevated temperature is significantly higher than coarse-grain material (~20% vs. ~10% at 1000oC, respectively). 22 Figure 20. TEM micrograph of fine- grained MA754.PDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility
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