Novel Powder Feedstock towards Microstructure Engineering in Laser Powder Bed Fusion: A Case Study on Duplex/Super Duplex and Austenitic Stainless-Steel Alloys
نویسندگان
چکیده
Additive manufacturing of Duplex Stainless Steels (DSS) and Super (SDSS) has been successfully demonstrated using LPBF in recent years, however, both alloys feature an almost fully ferritic microstructure the as-built condition due to fast cooling rates associated with Laser Powder Bed Fusion (LPBF) process. Blends DSS SDSS powders were formulated austenitic stainless-steel 316L powder, aiming achieve increased austenite formation during potentially minimize post heat treatments (solution annealing quenching). characteristics investigated process parameters optimized produce near dense parts. Nanoindentation (NI) tests conducted measure, not only local mechanical properties correlate them microstructure, but also gain a deeper understanding deformation behavior individual phases that cannot be studied directly by macroscopic tensile tests. Scanning Electron Microscopy (SEM) Backscatter Diffraction (EBSD) employed for microstructural analysis phase quantification. The EBSD maps revealed increase microstructures. Blend 1 resulted duplex consisting 10% at XY plane 20% XZ plane. content increasing proportion stainless steel powder blends. blend required much higher volumetric energy density fabrication This imposed slower solidification melt pool homogeneity, allowing adequate diffusion stabilizing elements. presented workflow findings from this study provide valuable insights into mixing development custom rapid material screening LPBF.
منابع مشابه
Effects of powder recycling on stainless steel powder and built material properties in metal powder bed fusion processes
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ژورنال
عنوان ژورنال: Metals
سال: 2023
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met13091546