Ni基超耐熱合金の高温腐食挙動に及ぼす製造方法の影響

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  • Effects of Manufacturing Processes on Hot Corrosion Behavior of a Ni-base Superalloy
  • Niキ チョウ タイネツ ゴウキン ノ コウオン フショク キョドウ ニ オヨ

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Effects of manufacturing processes and of solution treatment on hot corrosion behavior were investigated for a hot-corrosion-vulnerable Ni-base superalloy. The tested processes were single-crystallization (SC), directional solidification (DS), HIP-consolidation (HIP) and superplastic-forging of the HIP-consolidated material (SFG). Before solution treatment, specimens from DS were the most vulnerable to the corrosion. Their vulnerabilities differed depending on whether the corroding surface laid across or along the growing direction. The vulnerabilities of the specimens from HIP and SFG were 50 to 80% of those from DS. Effects of solution treatment differed depending on the manufacturing processes. It caused a considerable decrease in vulnerability for specimens from DS. The trend was reversed for those from HIP and SFG. As a result vulnerability for the specimens after solution treatment decreased in the order of SFG, HIP, SC and DS. Part of these effects could be understood by assuming that compositional and/or structural inhomogeneity within and around dendrites and crystal grains would make the alloy more vulnerable to the corrosion.

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