2428 750℃水蒸気環境中におけるInconel 625および617の応力下での表面酸化(S13-3 高温材料・構造の強度と破壊(3),S13 高温材料・構造の強度と破壊)

概要

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High efficient pulverized coal fired power plant, so called an Advanced Ultra SuperCritical plant, in which the main steam temperature and pressure are over 700℃and 30 MPa respectively, are considered in order to reduce fuel consumption and CO_2 emissions. However, in that condition, conventional iron based ferritic alloys are not applicable for long term operation because of these mechanical strength and oxidation resistance. Furthermore, oxidation mechanism under steam environment is different with that in air. Therefore, it is desirable to utilize the nickel based alloys as structural material due to its high temperature creep strength. In order to investigate the effect of bending stress on surface degradation behavior of nickel based alloys, Inconel 625, 617 and 718, the four-point bending tests under 750℃ steam environment were performed. Oxide scale was thickly formed on the surface of the Inconel 625, and 617 specimens. As for the effect of tensile stress on steam oxidation, clear difference was found in Inconel 625 specimen but wasn't in Inconel 617 specimen.
社団法人日本機械学会の論文
2007-09-07