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

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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.

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Min, S., Liu, H., Yang, M., Zhang, H., Hou, J., Zhang, K., … Huang, A. (2022). High-temperature oxidation performance of Ni-based GH3536 superalloy fabricated by laser powder bed fusion. Npj Materials Degradation, 6(1). https://doi.org/10.1038/s41529-022-00276-8

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