|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
||Fatigue Behavior of Additively Manufactured Haynes 230 at Room and Elevated Temperatures
||Muztahid Muhammad, Rukesh Gusain, Reza Ghiaasiaan, Paul Gradl, Shuai Shao, Nima Shamsaei
|On-Site Speaker (Planned)
This study investigated and compared fatigue behavior of Haynes 230 manufactured using two additive manufacturing (AM) technologies, namely, laser powder bed fusion and laser powder directed energy deposition. Original cylindrical rods went through similar multi-step heat treatments (HT), including stress relief, hot isostatic pressing, and solution treatment, and then were machined to the final geometry of standard test specimens. Fully-reversed, strain-controlled fatigue tests were conducted at room and different elevated temperatures. Microstructure and fracture surfaces were analyzed utilizing a scanning electron microscope. The micro-segregation and dendritic feature in the non-heat treated microstructure of both alloys were almost completely dissolved after full HT, and M6C/M23C6 carbide phases were formed at grain interiors and at grain boundaries. Finally, failure mechanisms of both alloys were discussed and compared. The fatigue fracture surfaces of both alloys consisted of microstructural facets as crack initiation sites instead of AM process-induced volumetric defects.
||Additive Manufacturing, Copper / Nickel / Cobalt, Other