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
Abstract
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.