|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Applications of Solidification Fundamentals
||Influence of Pore Formation and Their Roles on the Tensile Properties of 17-4 PH Stainless Steel Fabricated by Laser Powder Bed Fusion
||Dyuti Sarker, Ehsan Toyserkani
|On-Site Speaker (Planned)
Laser Powder Bed Fusion was used to make samples with gas atomized 17-4PH stainless steel powder at different process parameters. Powder characteristics like size distribution, morphology, phases at different atmospheres, as-well-as the microstructure and tensile properties of the printed parts at various energy densities were carried out. The microstructural analysis discovered the columnar dendrites with fully martensite regardless of the process parameters. The DSC results in Ar&N2 environments, it is confirmed that only N2 can stabilize the austenite and formed retained austenite. A detailed CT scan analysis on printed and fractured samples explored the effect of pores on the fracture mechanism. The sample printed with adequate energy density obtained lower porosity resulting in maximum tensile strength and elongation. The fracture mode also changes from brittle to ductile type in the tensile sample, printed with adequate energy density which indicates the pores morphologies and quantity significantly affect the fracture mode.
||Additive Manufacturing, Iron and Steel, Other