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<p>Additively manufactured Ni-base alloy IN625 suffered from intergranular oxidation (IGO) during air exposure at 900 °C. IGO is triggered by oxide buckling over the alloy’s grain boundaries (GBs), followed by oxidation of the open intergranular voids. Application of a 10 nm thick PVD coating of Ce induced a slower inward growth of the Cr<sub>2</sub>O<sub>3</sub> scale, better oxide adherence and as a result strongly suppressed IGO. The main beneficial effect provided by Ce is improved oxide adherence preventing oxide buckling and oxidation of intergranular voids.</p>

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PVD Ce-coating to mitigate intergranular oxidation of additively manufactured Ni-base alloy IN625

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月29日

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  • A. Chyrkin,
  • A. Fazi,
  • M. Sattari,
  • M. Thuvander,
  • K. Stiller,
  • M. Halvarsson,
  • E. Wessel,
  • D. Naumenko,
  • J. Froitzheim

摘要

Additively manufactured Ni-base alloy IN625 suffered from intergranular oxidation (IGO) during air exposure at 900 °C. IGO is triggered by oxide buckling over the alloy’s grain boundaries (GBs), followed by oxidation of the open intergranular voids. Application of a 10 nm thick PVD coating of Ce induced a slower inward growth of the Cr2O3 scale, better oxide adherence and as a result strongly suppressed IGO. The main beneficial effect provided by Ce is improved oxide adherence preventing oxide buckling and oxidation of intergranular voids.