|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing for Energy Applications III
||Microstructure-property of a novel 9Cr ferritic martensitic steel via additive manufacturing directed energy deposition
||Weicheng Zhong, Lizhen Tan, Kevin G. Field, Niyanth Sridharan, Ying Yang, Kurt Terrani
|On-Site Speaker (Planned)
A novel high Mn ferritic martensitic (FM) steel was designed and fabricated via additive manufacturing (AM) using the directed energy deposition technology for nuclear applications. The goal of this work is to evaluate the microstructure and mechanical performance of the as-built AM steel, in comparison with the normalized and tempered (N&T) FM steels. Tensile tests were performed from room temperature (RT) to 700℃, demonstrating the superior tensile strength of AM FM steels (over ~500MPa higher RT yield strength) than the N&T steels at all investigated temperatures, compromised with some ductility reductions. Multiscale microstructural characterization using EBSD and TEM indicated the refined prior austenite grain structure in the AM steel as a result of cyclic heating and cooling history. The high-density (1E22 m-3) refined precipitates and high-density (1E15 m-2) dislocations were correlated with the mechanical response of the AM steel.