High-Strain Rate and High-Temperature Properties of Additively Manufactured Nickel-Based Alloy 718

Nickel-based alloys are normally employed for aerospace components that experience high levels of stress at elevated temperaturesTemperature. With the emergence of metalMetals additive manufacturing (AMAdditive manufacturing (AM)), it is essential to determine the high-temperatureHigh temperature and high-strain rateHigh-strain rate properties of aerospace materialsMaterials fabricated by means of laser-powder bed fusion (LPBF). Therefore, in this work, samples of Alloy 718 fabricated using LPBF are tested using a compressive Split-Hopkinson Pressure Bar (SHPB) fitted with a radiation infrared furnace at a temperatureTemperature range of 25–400 °C and strain rate range of 1000–1500 s−1. The stress–strain curves were then modelled using phenomenological-, and artificial neural network-based constitutive materialMaterials models, such as modifiedModified Johnson–Cook, Hensel-Spittel, modifiedModified Hensel-Spittel, and back-propagating artificial neural network (ANN) models. Although the ANN model provided the most accurate simulation, other materialMaterials models such as Hensel-Spittel and modifiedModified Hensel-Spittel models provided Average Absolute Relative Errors of less than 15%.