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A D V A N C E D M A T E R I A L S & P R O C E S S E S | M A Y / J U N E 2 0 2 1 2 7 main microstructural features typical of LPBF (solidified melt pools, grains, and fine substructure) can be simultaneous- ly investigated by conventional LM, with the aid of bright and dark fields and po- larized light. Consequently, based on proper optical microscopy, further ad- vanced analyses can be more success- fully planned and targeted to specific aspects. ~AM&P For more information: Lavinia Tonelli, Ph.D. candidate, University of Bologna, Viale del Risorgimento 4, 40136 Bolo- gna, Italy, lavinia.tonelli2@unibo.it. This article has been adapted from a full length feature in Metallography, Microstructure, and Analysis, April 2021. doi.org/10.1007/s13632-021-00732-y. © ASM International 2021. Acknowledgments The research activity described here was carried out during the “Me- chanics and Advanced Engineering Sci- ences” Ph.D. course at the University of Bologna. Prof. Lorella Ceschini, Ph.D. supervisor, is greatly and kindly ac- knowledged for her scientific support. The precious contributions of Dr. Erica Liverani and Dr. Iuri Boromei in sam- ple production and analysis are also recognized. References 1. A. Vafadar, et al., Advances in Metal Additive Manufacturing: A Review of Common Processes, Industrial Appli- cations, and Current Challenges, Appl. Sci., Vol 11, 2021. 2. S.L. Sing and W.Y. Yeong, Laser Powder Bed Fusion for Metal Additive Manufacturing: Perspectives on Recent Developments, Virtual Phys. Prototyp., Vol 15, p 359-370, 2020. 3. T. DebRoy, et al., Additive Manu- facturing of Metallic Components – Process, Structure and Properties, Prog. Mater. Sci., Vol 92, p 112-224, 2018. 4. G.M. Karthik and H.S. Kim, Heterogeneous Aspects of Additive Manufactured Metallic Parts: A Review, Met. Mater. Int., Vol 27, p 1-39, 2021. 5. A. Takaichi, et al., Microstructures and Mechanical Properties of Co-29Cr- 6Mo Alloy Fabricated by Selective Laser Melting Process for Dental Applications, J. Mech. Behav. Biomed. Mater., Vol 21, p 67-76, 2013. 6. K. Darvish, et al., Selective Laser Melting of Co-29Cr-6Mo Alloy with Laser Power 180-360 W: Cellular Growth, Intercellular Spacing and the Related Thermal Condition, Mater. Charact., Vol 135, p 183-191, 2018. 7. V. Laghi, et al., Tensile Properties and Microstructural Features of 304L Austenitic Stainless Steel Produced by Wire-and-Arc Additive Manufacturing, Int. J. Adv. Manuf. Technol., p 3693-3705, 2020. 8. L. Tonelli, A. Fortunato, and L. Ceschini, CoCr Alloy Processed by Selective Laser Melting (SLM): Effect of Laser Energy Density on Microstruc- ture, Surface Morphology, and Hard- ness, J. Manuf. Process., Vol 52, p 106-119, 2020. 9. L. Tonelli, et al., Selective Laser Melting of a CoCrMo Alloy for Biomed- ical Applications: Correlations Between Microstructure and Process Parame- ters, Metall. Ital., Vol 111, p 41-47, 2019. 10. D. Klarstrom, P. Crook, and J. Wu, Metallography and Microstruc-tures of Cobalt and Cobalt Alloys, in: G.F. Vander Voort (Ed.), ASM Handbook, Vol 9, Metallogr. Microstruct., p 762-774, ASM International, 2004. Fig. 3 — High magnification LMmicrographs, bright field, dark field, and polarized light: (a), (c), and (e), H section; (b), (d), and (f), V section. (a) (b) (c) (d) (e) (f)