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5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 MA 754 in flowing supercritical CO2 – 1000oC, 1500 psi 0 50 100 150 200 250 300 350 400 Exposure time, hours Figure 25. Plot of the time-averaged corrosion rate showing that further corrosion is slowed by the growing corrosion layer. Task 3-3 Summary report on MA 754 Preparation of this report is in progress and largely complete. Only the compositional analysis of the corrosion layers shown in Figure 24 remains to be determined. The report will contain appropriate comparisons to other commercially available alloys. Also, the suitability of this alloy for the intended application will be discussed. This report should be completed early in the first quarter of FY05. Task 3-6 Analysis of creep microstructures in MA 754 Failed creep specimens were prepared for metallographic study as well as electron microscopy. The fractographic and microscopic examinations of coarse-grained MA754 creep specimens were completed. The results of this examination were combined with creep and elevated temperature mechanical test data and incorporated into the manuscript mentioned under Task 3-1-2. As also mentioned, the manuscript has been accepted for publication in Metallurgical and Materials Transactions A and has been attached at the end of this report as an appendix. Planned Activities Complete Task 3-2-3 Corrosion testing of fine-grain MA 754 and compare the corrosion behavior to coarse-grained MA 754 Initiate and complete Task 3-2-3 Corrosion testing of alternate alloys. Tentatively we plan on documenting the corrosion behavior of I-617, an alloy receiving considerable attention for use in various high temperature areas of the NGNP. Complete the summary report on MA 754 (Task 3-3) with recommendations on the suitability of MA 754 for use in a supercritical Brayton cycle. Issues/concerns: There are no issues and/or concerns. 27 Corrosion Rate, millimeters/yearPDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility
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