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1.E-05 1.E-06 1.E-07 1.E-08 1.E-09 1.E-10 n=3.9 n=7.9 n=10.0 800 C 900 C 1000 C o o o 10 Stress, MPa 100 Figure 21. Minimum creep rates in fine-grained MA 754, transverse orientation. Task 3-2-2 Corrosion testing of MA 754 in supercritical CO2 Early in the first quarter of FY04 the first MA754 corrosion sample was put in the supercritical CO2 system and testing was initiated. Minor design and hardware deficiencies were found that were corrected before long-term corrosion testing in supercritical CO2 was carried out. An induction generator used to heat the sample was replaced with a high temperature box furnace, capable of reaching temperatures in excess of 1200oC. Minor modifications to the sample and sample connection were also made to accommodate the change of heat sources. The system was reconnected and run. Details of the corrosion work are given below. Initial corrosion tests An initial corrosion test of a coarse-grained MA754 sample in CO2 was conducted for 47 hours at 3000 psi and 1000 oC. After 47 hours the sample developed a leak and was removed, sectioned longitudinally to show the inside wall of the sample tube and examined with an optical microscope. Preliminary analysis showed the formation of a thin corrosion layer on the inside walls. Detailed analysis directly adjacent to the outlet of the sample showed crack formation and evidence of corrosion/erosion within this specific area, Figures 22 and 23. This was unexpected since the connection was outside the hot zone of the furnace, although the flowing supercritical CO2 undoubtedly heated this connection to some extent. This initial corrosion sample used a Swaglok type fitting to connect the high-pressure lines to the corrosion sample. As a consequence, the thin walled region of the sample was subjected to substantial compressive stresses when the fitting was tightened. The end fittings were redesigned to eliminate the stresses in this region since the cause of the observed intergranular cracking, e.g. over-tightening the fittings or cracking due to corrosion effects, could not be definitively determined. 24 Minimum Creep Rate, (sec ) -1PDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle
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