Studies of Post-Fabrication Heat Treatment of L-PBF-Inconel 718: Effects of Hold Time on Microstructure, Annealing Twins, and Hardness

The widely adopted temperature for solid solution heat treatment (ST) the conventionally fabricated Inconel 718 is 1100 °C a hold time of 1 h or less. This ST scheme is, however, not enough to dissolve Laves and annihilate dislocations completely in samples with Laser metal powder bed fusion (L-PBF) additive manufacturing (AM)-Inconel 718. Despite this, highest hardness obtained after aging temperatures (970–1250 °C) at °C/1 as we have ascertained our previous studies. unreleased residual stresses retained lattice defects potentially affect other properties material. Hence, this work aims investigate if longer will lead complete recrystallization while maintaining not. For study, L-PBF-Inconel were various times (1, 3, 6, 9, 16, 24 h) aged study effects on microstructure hardness. In addition, sample was directly bypassing ST. (ST aged) gain by 43–49%. high density annealing twins evolved during 3 only slightly varies