|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location-Specific Processing-Microstructure-Property Relationships
||A-7: Build Theme Modifications to Investigate Microstructural Development in Additively Manufactured 17-4PH Stainless Steel Parts
||Yu Sun, Mark Aindow, Rainer J. Hebert
|On-Site Speaker (Planned)
A combination of scanning and transmission electron microscopy studies has been used to investigate the microstructures in 17-4PH stainless steel components manufactured by selective laser melting powder-bed processing. These studies reveal a complex microstructure consisting of regions with fine and coarse ferrite grains, small amounts of retained austenite, and inclusions retained from the powder. The use of default cross-hatch scanning patterns inclined at 45˚ to the component edges complicates the analysis of the microstructure and frustrates attempts to relate these features to the melt pools from the laser tracks. To overcome these problems we have produced test samples in which the laser is scanned in a single direction parallel to the component edges, and the spacing of the tracks is increased to produce clearer separation between the melt pools. The analysis of such samples provides a clear insight into the origins of and relationships between each of the microstructural features.
||Planned: Supplemental Proceedings volume