|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Fatigue and Fracture
||Microstructural Effects on Environmental Assisted Crack Growth Behaviors of Austenitic Stainless Steel by Laser Powder Bed Fusion
||Xiaoyuan Lou, Raul Rebak
|On-Site Speaker (Planned)
Different from conventional metal fabrication methods, laser powder bed fusion creates extremely fast heating/cooling during solidification and produces non-equilibrium heterogeneous microstructure, including hierarchical boundary structure, fine dendritic grain, inhomogeneous element segregation, and unexpected precipitation. Without forging, some microstructural features may not be fixed by post heat treatment process. This study reports our comprehensive work on understanding the effects of microstructure on corrosion fatigue and stress corrosion crack growth behaviors of additive austenitic stainless steel in high temperature water. The nature of microstructural characteristics and their evolution under different laser processes and heat treatments were studied in detail. This work aims to establish the processing-structure-crack propagation relationship for additive stainless steel and provide guidance to the ongoing effort of establishing nuclear specification for additive materials.
||Planned: Supplemental Proceedings volume