Temperature Dependence of Oxidation Properties for 5th Generation Ni-Base Single-Crystal Superalloys

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  • Kawagishi Kyoko
    High Temperature Materials Group, Materials Engineering Laboratory, National Institute for Materials Science
  • Sato Akihiro
    High Temperature Materials Group, Materials Engineering Laboratory, National Institute for Materials Science Materials Technology Department, Research & Engineering Division, Aero-Engine & Space Operations, Ishikawajima-Harima Heavy Industries Co., Ltd.
  • Kobayashi Toshiharu
    High Temperature Materials Group, Materials Engineering Laboratory, National Institute for Materials Science
  • Harada Hiroshi
    High Temperature Materials Group, Materials Engineering Laboratory, National Institute for Materials Science

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Other Title
  • 第５世代Ｎｉ基超合金の耐酸化特性とその温度依存性

Description

  The oxidation properties of the 5th generation Ni-base Superalloys, TMS-173 and TMS-196 were investigated comparing with 2nd generation superalloy, PWA-1484. Isothermal oxidation examination was performed at the temperatures from 1023 K to 1373 K in air for up to 3.6×106 s, and the oxides formed on the specimen surface during oxidation tests were identified by using XRD analysis and SEM cross section observation.<br>   TMS-173 formed thick NiO layer on the surface caused by the outward diffusion of Ni at 1023 K and showed poor oxidation resistance at 1173 K and 1373 K due to the spinel formation. TMS-196 and the 2nd generation superalloy PWA-1484 show protective Al2O3 layer formation and excellent oxidation resistance at all temperatures examined in this study. This favorable result was caused by their high Cr content.<br>

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