Materials Research Letters (Aug 2024)

Interactions of Re and hydrogen at γ/γ′ interfaces enhanced hydrogen-embrittlement resistance of Re-optimized Ni-based superalloy

  • Yunsong Zhao,
  • Tingting Zhao,
  • Guangxian Lu,
  • Yuanyuan Guo,
  • Jian Zhang,
  • William Yi Wang,
  • Yushi Luo,
  • Jinshan Li

DOI
https://doi.org/10.1080/21663831.2024.2356220
Journal volume & issue
Vol. 12, no. 8
pp. 551 – 560

Abstract

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This work elucidates the interactions between Re and hydrogen at γ/γ′ interfaces, enhancing the hydrogen-embrittlement resistance of nickel-based single-crystal superalloy (Ni-SX). The H-charged Ni-SX exhibits severe embrittlement characterized by the appearance of parallel dislocation slip bands and micro-cracks, which could be effectively mitigated through improving the Re content. The segregation behaviors of hydrogen at γ/γ′ interfaces, as captured by hydrogen microprint technique, significantly diminish interfacial cohesion strength by reducing the local atomic bonding strength. Detailed characterizations of bonding charge density highlight that Re plays a crucial role in reducing hydrogen embrittlement susceptibility by suppressing the hydrogen-induced degradation of bonding strength.

Keywords