高速燃焼ガス中におけるニッケル基超耐熱合金MM-247の高温腐食組織

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  • Hot Corrosion Morphology of Ni-base Superalloy MM-247 Corroded in High Velocity Combustion Gas Stream
  • コウソク ネンショウ ガスチュウ ニ オケル ニッケルキ チョウ タイネツ ゴ

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Hot corrosion behavior of a nickel-base superalloy, MM 247, was examined at 800-1, 050°C in combustion gases flowing at Mach 0.35-0.6 which were prepared from 1.2-24ppm Na2SO4-containing air and 0.5% sulfur-containing fuel. The results showed that the corrosion morphologies were classified into two categories. The first was characterized by a thin corroded zone. The second was characterized by a thick corroded zone with severe internal oxidation and severe sulfidation. In the case of the specimen corroded at Mach 0.5 and 900°C with 6ppm Na2SO4, the first was observed at the central area of the leading edge and the second was observed at the marginal area of the leading edge and the down-stream region. The corrosion morphology of the central area changed from the first to the second with increasing temperature and gas velocity, and with decreasing Na2SO4 content. It is proposed that these changes in the corrosion morphology are attributed to variation in the thickness and replacement frequency of the salt deposit layer, which depend on test conditions.

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