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To clarify the effect of solution heat-treatment on the oxidation resistance of Ni-base single crystal superalloy TMS-238, evaluation of dendrite/inter-dendrite segregation of alloying elements in as-cast and heat-treated samples, and its effect on cyclic oxidation resistance were investigated. Cyclic oxidation test results at 1100 °C for up to 150 cycles clearly showed that the as-cast samples with element segregations had lower oxidation resistance compared to heat-treated samples with homogeneous structure. Further, for the as-cast sample, rapid growth and spallation of oxide consisting of NiO, Cr2O3, and Al2O3 were observed around the dendrite core even for 10 cycles oxidation. Analysis of sub-surface on sample isothermally oxidized at 1100 °C for 10 min showed that rapid oxide growth is due to the formation of discontinuous Al2O3 layer at dendrite core with lower Al concentration. Furthermore, in this study, the threshold value of Al concentration and Gibbs energy for the formation of continuous Al2O3 layer were estimated and determined to be around 5.2 wt.% and -"556.6 ± 0.5" kJ/mol, respectively. This indicated that the solution heat-treatment for TMS-238 should be conducted above 1305°C for exhibiting oxidation resistance at 1100 °C, to meet the threshold value within the whole region between dendrite to inter-dendrite.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Ni-Base Superalloy, oxidation resistance

刊行年月日: 2023-10-02

出版者: Springer Science and Business Media LLC

掲載誌:

• Metallurgical and Materials Transactions A (ISSN: 15431940) vol. 54 issue. 12 p. 4825-4833

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1007/s11661-023-07205-7

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更新時刻: 2025-12-09 16:30:28 +0900

MDRでの公開時刻: 2025-12-09 12:30:31 +0900