Characterization and Comparison of Inconel 625 Processed by Selective Laser Melting and Laser Metal Deposition . Issue 3 (15th December 2016)

• Record Type: Journal Article
• Authors: Marchese, Giulio; Garmendia Colera, Xabier; Calignano, Flaviana; Lorusso, Massimo; Biamino, Sara; Minetola, Paolo; Manfredi, Diego
• Is Part Of: Advanced engineering materials. Volume 19:Issue 3(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-12-15
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201600635
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : Inconel 625 (IN625) is a Ni superalloy ideal for the aeronautic and aerospace industries because of its superior mechanical and corrosion resistance properties. However, the production of components with complex geometries by traditional processes is very expensive, so additive manufacturing (AM) technologies can be applied to reduce the costs. In this work, IN625 alloy is processed by two different AM processes: selective laser melting (SLM) and laser metal deposition (LMD). First, the different powders are characterized, and then a parameter optimization is performed to obtain the highest possible density (over 99.8%) and hardness, showing very fine microstructures. The LMD process allows the highest build‐up rate, but results in less dimensional accuracy and a lower hardness than the SLM process. Abstract : Selective Laser Melting (SLM) and Laser Metal Deposition (LMD) processes are optimized to fabricate Inconel 625 samples with the highest relative density, reaching mean values of 99.96% and 99.89%, respectively. In both cases, the microstructure is extremely fine, but LMD samples show coarser dendritic structures than SLM ones of about one order of magnitude, and larger precipitates.