npj Materials Degradation (Aug 2022)

High-temperature oxidation performance of Ni-based GH3536 superalloy fabricated by laser powder bed fusion

  • Shiling Min,
  • Hui Liu,
  • Mengmeng Yang,
  • Huawei Zhang,
  • Juan Hou,
  • Kai Zhang,
  • Jingjing Liang,
  • Jinguo Li,
  • Hao Wang,
  • Jianqiu Wang,
  • Aijun Huang

DOI
https://doi.org/10.1038/s41529-022-00276-8
Journal volume & issue
Vol. 6, no. 1
pp. 1 – 12

Abstract

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Abstract This study investigates the effect of microstructure on short-term and long-term oxidation behaviours of GH3536 superalloy fabricated by laser powder bed fusion (LPBF), in which the superalloy is isothermally oxidised at 950 °C for 6 h and 500 h in air. The LPBF sample exhibits improved oxidation resistance compared with a wrought counterpart after long-term exposure. The effect of microstructure diversity between LPBF and wrought samples on oxidation behaviour is discussed. The cellular structure produced during the LPBF process acts as a rapid diffusion path to accelerate the formation of a protective film in the initial stage, leading to an enhancement in oxidation resistance for extended exposure.