|About this Abstract
||Materials Science & Technology 2020
||Phase Transformations in Additively Manufactured Materials
||Process Optimization and Microstructure Analysis to Understand Laser Powder Bed Fusion of Stainless Steel 316L
||Nathalia Diaz Vallejo, Cameron Lucas, Nicolas Ayers, Holden Hyer, Brandon McWilliams, Kyu C Cho, Yongho Sohn
|On-Site Speaker (Planned)
||Nathalia Diaz Vallejo
Microstructural development and mechanical behavior of 316L stainless steel was investigated over a wide range of laser powder bed fusion (LPBF) parameters (laser power, scan speed, hatch spacing, and slice thickness). The starting powder had a size distribution of D10 = 22 um; D50 = 36 um; D90 = 50 um. SLM 125HL was employed for LPBF. Use of energy density between 46 and 127 J/mm3 produced nearly fully dense (≥ 99.8 %) samples, and this included the best parameter set: power = 200 W; scan speed = 800 mm/sec; hatch spacing = 0.12 mm; slice thickness = 0.03; energy density = 69 J/mm3). Microstructural features including melt pool and cellular structure were quantified to better understand the LPBF process. Using the optimized LPBF parameters aforementioned, the as-built 316L had, on average, yield strength of 572 MPa, tensile strength of 710 MPa and 48% strain at failure.