Abstract
The study examines the fretting wear of the Laser Powder Bed Fusion (L-PBF) processed IN718 alloy under gas turbine-like conditions. It involves a large (>106) test cycle investigation at 550 °C and ∼800 N. The heat-treated L-PBF IN718 material exhibited higher hardness compared to heat-treated wrought IN718 due to the formation of finer precipitation of γ' and γ'' in the FCC nickel matrix. A custom wear test setup simulates the harsh industrial environment, revealing a two-fold lower wear coefficient in the L-PBF alloy due to improved hardness and a finer microstructure. The friction coefficient remains marginally different, with the L-PBF alloy showing lower values during the initial phase. The wear mechanisms are similar, but the wrought IN718 HT exhibits severe oxidation-assisted galling.
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