Room and elevated temperature fatigue crack propagation behavior of Inconel 718 alloy fabricated by laser powder bed fusion

•Room and elevated temperature FCP behavior of L-PBF IN718 was examined.•L-PBF IN718 showed higher FCP rates than CM IN718 in low and intermediate ΔK regime.•Effect of orientation on FCP behavior of L-PBF IN718 was negligible.•FCP rates of L-PBF IN718 at 650 °C were lower than those at 25 °C in low ΔK regime. The fatigue crack propagation (FCP) behavior of Inconel 718 alloy manufactured by laser powder bed fusion (L-PBF) was studied at 25 and 650 °C, and compared to those of conventionally processed counterpart. The FCP rates of L-PBF Inconel 718 alloy were found to be significantly higher than those of conventionally processed counterpart at 25 °C in low and intermediate ΔK regimes. The FCP rates decreased in near-threshold ΔK regime at 650 °C, while the reversal occurred above ΔK of 7 MPa√m, as compared to those at 25 °C. The FCP behavior of L-PBF Inconel 718 alloy was discussed based on micrographic and fractographic analyses.