Effect of Powder Recycling on Environment-Assisted Fracture of Inconel 718 Alloy Fabricated by Laser Powder Bed Fusion

Abstract

Environment-assisted fracture (EAF) behavior of Inconel718 (IN718) specimens made from virgin and recycled powder by laser powder bed fusion (L-PBF) process was investigated. To this, in situ slow strain rate tests (SSRTs) and fatigue crack propagation (FCP) tests were conducted in air and 3.5 pct NaCl/60 degrees C/E-corr + 0.1 V-SCE. Powder recycling up to 6 times did not affect the EAF sensitivity of L-PBF IN718 specimens in chloride-bearing environment, despite the marginal decrease in electrochemical resistance. Detailed fractographic and micrographic analyses were performed to identify the effect of powder recycling on static and dynamic EAF behaviors of L-PBF IN718 specimens.