About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Reduction in Shrinkage of Binder Jet Printed Large Stainless-Steel Parts Using Novel Metal Powders |
Author(s) |
Alexander Paterson, Kyle Myers, Adam Bartel, Austin Peters |
On-Site Speaker (Planned) |
Alexander Paterson |
Abstract Scope |
One limitation of the binder jet AM process is the dimensional instability of large parts caused by shrinkage during the sintering process. Today’s metal powder materials can be printed to 55-60% of full density resulting in shrinkages between 16-22%. The design compensations necessary for this high level of shrink practically limits binder jet part sizes to below 5 inches and can limit feature size variations in part design. A novel approach to metal powders has resulted in parts that are printed to >70% of full density resulting in shrinkages <10%. This allows complex geometries to print with significantly less shrinkage resulting in better distortion control and tolerancing. Parts larger than 6 inches in size were manufactured with the novel 316L powder and were compared to standard binder jet 316L powders. The parts were scanned for distortion and measured against the original CAD model. External shrinkage rates were measured and compared. |