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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Pioneers in Additive Manufacturing
Presentation Title Directed Light Fabrication: A Near-Net Shape Process using Laser Assisted Metal Deposition
Author(s) Dan J Thoma
On-Site Speaker (Planned) Dan J Thoma
Abstract Scope Directed Light Fabrication (DLF) was developed in the early 1990’s at Los Alamos National Laboratory. The original notion for the technology stemmed from solving joining issues in autogenous and dissimilar welds, where filler material was often used in the fabrication process. With the growing utilization of CAD and CNC technology, the goal was to fuse gas delivered metal powders within a focal zone of a laser beam to produce fully dense, near-net shape, 3-dimensional metal components from a computer generated solid model. Over the next decade, the technology evolved to 5-axis control, and parts from aluminum to tungsten were fabricated, including many intermetallic systems (even from elemental blends). Solidification studies indicated continuous liquid-solid interfaces with cooling rates from 100 K/s to 100,000 K/s, and mechanical properties were comparable to conventionally processed commercial product. Cost, surface finish, and component qualification issues ended the DLF process in the early 2000’s.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


3DP Retrospective: Do Inventors Know What They Are Doing?
A-94: 3D Additive Manufacturing of Metals at Micro/Nanoscale Using Localized Electrodeposition
A-95: Direct Metal Write Additive Manufacturing of Rare-earth Modified Aluminum Alloys Using Electromagnetic Heating Systems
A-96: FEM Modeling of Steel Additive Manufacturing Using Laser Hot-Wire Process
A-97: Microstructure Evolution and Galling Properties of Hard Facing Coatings Deposited Using Laser Directed Energy Deposition
A-98: Novel High Temperature Drop on Demand Liquid Metal-jetting for the Production of Complex 2D and 3D objects
A History of Additive Manufacturing
AFRL Contributions to Additive Manufacturing of Titanium, ca 2000
Assent and Decline of LOM Technology
Directed Light Fabrication: A Near-Net Shape Process using Laser Assisted Metal Deposition
Early Developments of AM within the UK
Laser Deposition of Metallic Powders
Laser Engineered Net Shaping - AM Metal Parts with Exceptional Material Properties
Making Things Bit-by-byte: Opportunity in a Fortuitous Convergence of Technologies
Pioneering International Consensus
Process Fundamentals for Selective Laser Melting: Power Ratio, Melting, Porosity, and Build Properties

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