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the same test as the fine grained MA 754 (results described under subtask 3-2-2), in the multi-sample test system, Fig. 4-10. The two materials were in separate containment tubes and cross contamination should have been minimal, i.e. the two materials were run in parallel test lines. The samples, again, had various surface finishes, i.e. 6A – 60 grit, 6B – 120 grit, 6D – 320 grit, 6E – 800 grit and 6F – as-received. These samples were black after exposure to high temperature, supercritical CO2 and appeared similar to the MA 754 samples. Table 4-6 records the corrosion behavior of this alloy. During cleaning, the corrosion layer was found to be much more adherent than the corrosion layer on the MA 754. In fact, some samples could not be cleaned completely in a reasonable amount of time, i.e. sample 6E and 6F in Table 4-6. The average corrosion rate, excluding samples 6E and 6F, is 0.25 mm/year. This is significantly lower than the corrosion rate for either fine- or coarse-grained MA 754 for a similar exposure time, Fig. 4-12 and Table 4-5. However, it should be kept in mind that the exposure time was relatively short and the long term corrosion rate may be significantly different, especially is spalling or metal dusting occurs at longer exposure times. Table 4-6. Alloy I-617 Sample ID Initial Wt, g Final Wt, g Change, g Length, mm Width, mm Thickness, mm Apparent Corrosion Rate, mm/yr 6A 1.2568 1.2542 0.0026 13.26 7.85 1.45 0.25 6B 1.2632 1.2591 0.0042 13.28 7.92 1.44 0.28 6D 1.2741 1.2738 0.0003 13.25 7.91 1.46 0.22 6E 1.2910 1.2909 0.0001 13.25 7.82 1.50 0.16** 6F 1.3718 1.3681 0.0037 13.28 7.94 1.57 0.20** * Exposure time = 175 hours **Sample could not be completely cleaned Metallography samples also were prepared and the corrosion layer analyzed. Figure 4-17a shows a high magnification photograph of the I-617 sample surface. Significant corrosion following the grain boundaries is observed, suggesting intergranular corrosion. This is in contrast to MA 754 which appears to corrode more uniformly over the entire surface, Figure 4-17b, although short intrusion were found, Fig. 4-16a. Intergranular corrosion can lead to relatively high corrosion rates. Intergranular corrosion has already penetrated ~22 microns into the base metal in just 175 hours. Further intergranular corrosion may cause large pieces of base metal to fall out, resulting in a sudden increase in the corrosion rate. Therefore, it is extremely important to perform long term exposures on this material to fully elucidate the long term corrosion behavior of I-617. 72PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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