|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Environmental Degradation of Additively Manufactured Alloys
||Hydrogen Embrittlement of Cathodically Pre-charged Inconel 718 Fabricated via Selective Laser Melting
||Claudia Tatiana Santos Maldonado, Alfredo Zafra, Emilio Martinez-Paņeda, Roberto Morana, Minh-Son Pham
|On-Site Speaker (Planned)
Additively manufactured (AM) Inconel 718 holds great potential in aerospace, power generation and oil & gas applications due to its excellent mechanical properties. However, to ensure the mechanical integrity and assist the development of next generations sustainable 3D printed Ni-based alloys, this phenomenon needs to be thoroughly studied and understood. In this work, the hydrogen embrittlement (HE) susceptibility of AM Inconel 718 is investigated via pre-cathodic charging in 3wt.% NaCl at 90°C. SEM and EBSD results show the difference in grain morphology, SSRT shows the transition from ductile to brittle with a reduction of ductility to 11% and 5%, in wrought and AM, respectively. And post-mortem fractography analysis brings insights into the HE mechanisms driving the failure process; mainly, microvoid formation (MVC), localized plasticity (HELP) and decohesion of lattice (HEDE) that leads to intergranular cracking along the equiaxed grains in wrought or through cell dendrites in AM specimens.
||Additive Manufacturing, Characterization, Other