|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||Microstructure and Mechanical Property Relationships in Additively Manufactured 304L
||Michael Maguire, Jeffrey Rodelas, Jay Carroll, Dave Adams, Benjamin Reedlunn, Joseph Bishop, Bo Song, Jack Wise
|On-Site Speaker (Planned)
Additively Manufactured (AM) 304L stainless steel was prepared via direct metal deposition of powder in laser-based systems utilizing powers of 500 to 3800W. The deposits were characterized with analytical microscopy to determine the phase structure, their morphology, and crystallographic orientation. Microstructures were typical of multipass weldments; namely, two phase austenite plus ferrite indicative of primary ferrite solidification, cellular or cellular dendritic constituents, and a readily apparent sub-grain structure. Uniaxial tension and compression testing at room temperature with varying strain rates were used to determine flow stress behavior. Shear testing on AM deposits at room temperature and sub-ambient was conducted to assess austenite phase stability within the solidification structure. Microchemical segregation played a role in austenite stability during deformation, making these materials more prone to deformation-induced martensite. The role that solidification sub-grain structure and austenite stability play in mechanical property differences between AM and wrought material will be discussed.
||Planned: A print-only volume