Arc-based directed energy deposited Inconel 718: role of heat treatments on high-temperature tensile behavior

This study evaluated the effect of dedicated heat treatments (1050 degrees C, 1100 degrees C, 1142 degrees C, and 1185 degrees C/2 h + double-aging) on the uniaxial tensile properties at elevated temperature (650 degrees C) of Inconel (R) 718 fabricated via arc plasma directed energy deposition. They enabled to meet, for the first time, the AMS 5662 requirements at elevated temperature. Tensile tests exhibited ductile strain-stress curves. The 1100 degrees C/2 h + double-aging showed the best performance (YS0.2%, UTS, and elongation of 967 MPa, 1126 MPa, and 18.7%, respectively). Additionally, vertical specimens evidenced dynamic strain aging, although no brittle-like features were observed.