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Meeting Materials Science & Technology 2019
Symposium Additive Manufacturing: Effective Production, Characterization, and Recycling of Powder Materials
Presentation Title Powder Specification Needs for Steels in the LPBF Process
Author(s) Elias Jelis, Michael Hespos, Matthew Clemente, Ryan Carpenter
On-Site Speaker (Planned) Elias Jelis
Abstract Scope U.S. ARMY CCDC Armaments Center has encountered two instances which demonstrate the need for proper powder specifications. First, inadequate chemistry specifications were requested for 4340 steel for the laser powder bed fusion (L-PBF) process. This resulted in higher than desired phosphorus content which contributed to parts cracking. The build platform temperature was raised to eliminate cracking, but the surrounding powder properties were altered, which will be discussed. Second, refractory contaminants in Aermet 100 powder negatively impacted the parameter optimization process. After initial parameter development, mechanical test specimens were heat treated and machined. Unfortunately, all the builds resulted in substandard mechanical properties. Post Processing and machine maintenance issues were vetted in an attempt to explain the property variation. The results of the study show the importance of powder feedstock on the L-PBF process.
Proceedings Inclusion? Planned: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Additive Manufacturing Alloys: Influence of Powder Preparation Method in Aluminum Matrix Composites
Assessment of 316L Stainless Steel Powder Produced from Recycled Machining Chips for Closed Lifecycle Additive-Subtractive Manufacturing
Characterization of Gas Atomized Aluminum Alloy Powder for Additive Manufacturing Applications
Characterization of Nickel-base Superalloy MAR-M247 Powders by Synchrotron X-ray Computed Tomography
Characterization of Titanium Powder Produced from Battlefield Scrap for Additive Manufacturing
Determination of Viscosity of Metal Melts by High Temperature Rheometry
Effects of Recycling PREP and Plasma Atomized Ti-6Al-4V Powder from LENS Process
Exploring the Feasibility of Cryomilled Aluminum Alloy 5083 as Feed Stock Material for Additive Manufacturing
Hydrogen Assisted Magnesiothermic Reduction (HAMR) for Making Low-oxygen Ti Powder
Metal Particulate Produced by Modulation-assisted Machining
P3-26: Identifying Correlations between Metal Powder Properties and Binder Jet Print Settings to Optimize Process
Potentials and Risks in Hybrid Manufacturing
Powder Specification Needs for Steels in the LPBF Process
Surface Area as a Powder Morphology Probe
Synchrotron X-ray CT of AM Feedstock Metal Powder: A Validation of Metallographic Porosity Measurements.
Understanding Powder Morphology and Its Effect on Flowability through Computer Vision and Machine Learning In Additive Manufacturing
Understanding Surface Area Measurement for Improved Powder Characterization

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