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Title: Laser powder bed fusion of 316L stainless steel with 2 wt.% nanosized SiO2 additives: Powder processing and consolidation
Authors: Stylianou, Rafael 
Evangelou, Angelos 
Loizou, Alexandros 
Kim, Donghyuk 
Wharton, Julian 
Koutsokeras, Loukas E. 
Constantinides, Georgios 
Delimitis, Andreas 
Kyratsi, Theodora 
Major Field of Science: Engineering and Technology
Field Category: Mechanical Engineering
Keywords: 316L stainless steel;Ball milling;Crystallographic texture;Melt pools;Selective laser melting;Silica
Issue Date: 1-Sep-2023
Source: Powder Technology, 2023, vol. 427
Volume: 427
Journal: Powder Technology 
Abstract: Gas atomized 316L stainless steel powder was processed with 2 wt.% of nanosized SiO2 in a planetary ball milling (BM) system to produce feedstock material for laser powder bed fusion (L-PBF). X-ray diffraction (XRD) of powders revealed the development of micro-strains over increasing milling durations and the strain-induced ferrite formation. BM was limited in duration to preserve the austenitic phase and morphological characteristics analyzed by electron microscopy. In turn, 316L-2wt.% SiO2 feedstock powder was consolidated by L-PBF with varied process parameters and scanning strategies, that demonstrated a maximum density of 7.84 g/cm3 and relatively stable microhardness values close to 220 HV. A distinct (110) preferred orientation was observed in XRD pole figures of austenite for deeper melt pools over the building direction, whereas in-plane alignment reflected variations in scanning strategy. Furthermore, electron backscatter diffraction revealed columnar grains accompanied by the suspected depletion of SiO2, while electrochemical behavior displayed consistent characteristics.
ISSN: 00325910
DOI: 10.1016/j.powtec.2023.118714
Rights: © Elsevier
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation : University of Cyprus 
University of Southampton 
Cyprus University of Technology 
University of Stavanger 
Appears in Collections:Άρθρα/Articles

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