|About this Abstract
||Materials Science & Technology 2019
||Additive Manufacturing: Effective Production, Characterization, and Recycling of Powder Materials
||Powder Specification Needs for Steels in the LPBF Process
||Elias Jelis, Michael Hespos, Matthew Clemente, Ryan Carpenter
|On-Site Speaker (Planned)
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.
||Planned: At-meeting proceedings