About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Use of Water Atomized Powder with Non-spherical Morphology in a Laser Powder Bed Fusion Additive Manufacturing Process |
Author(s) |
Mahya Shahabi, Tianyu Zhu, Jagannath Jayachandran, Sneha Prabha Narra |
On-Site Speaker (Planned) |
Sneha Prabha Narra |
Abstract Scope |
Depending on the alloy and the powder manufacturing methods, powder costs can be one of the major cost contributors in metal additive manufacturing (AM). A viable way to reduce these costs is by using relatively cheaper powders compared to gas atomized powders. Hence, the focus of this work is to demonstrate the use of powders with irregular/non-spherical morphology in the laser powder bed fusion process. We investigated the use of water atomized 17-4 precipitation hardening (PH) stainless steel powder with irregular/non-spherical morphology. Optimal deposition conditions were developed to achieve a part density comparable to samples fabricated using standard gas atomized powders. Overlap depth percentage between adjacent melt tracks was identified as the key factor for controlling porosity in the as-fabricated parts. Also, we will present results from a preliminary study on pore elimination considering the effect of thermocapillary, buoyancy, and drag force as well as the inertia of the liquid. |