Nov_Dec_AMP_Digital

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 | N O V E M B E R / D E C E M B E R 2 0 1 7 4 0 iTSSe TSS iTSSe TSS JTST HIGHLIGHTS 10 The Journal of Thermal Spray Technology (JTST), the official journal of the ASM Ther- mal Spray Society, publishes contributions on all aspects— fundamental and practical—of thermal spray science, including processes, feedstock manufac- ture, testing, and characteri- zation. As the primary vehicle for thermal spray information transfer, its mission is to syner- gize the rapidly advancing thermal spray industry and related industries by presenting research and development efforts leading to advancements in implementable engineering ap- plications of the technology. Articles from the October and December issues, as selected by JTST Editor-in-Chief Armelle Vardelle, are highlighted here. The October issue contains a special focus on “Cold Spray,” organized by guest editors Jean-Gabriel Legoux, Amadeu Concustell, Michel Jeandin, Thomas Klassen, Heli Koivuluoto, and Julio Villafuerte. The first three articles highlighted below are from this special focus. In addition to the print publica- tion, JTST is available online through springerlink.com . For more information, visit asminternational.org/tss. COLD SPRAY DEPOSITION OF FREESTANDING INCONEL SAMPLES AND COMPARATIVE ANALYSIS WITH SELECTIVE LASER MELTING Sara Bagherifard, Gianluca Roscioli, Maria Vittoria Zucco- li, Mehdi Hadi, Gaetano D’Elia, Ali Gökhan Demir, Barbara Previtali, Ján Kondás, and Mario Guagliano Cold spray offers the possibility of obtaining almost ze- ro-porosity buildups with no theoretical limit to the thickness. Moreover, cold spray can eliminate particle melting, evapora- tion, crystallization, grain growth, unwanted oxidation, unde- sirablephases, and thermally induced tensile residual stresses. Such characteristics can boost its potential to be used as an additive manufacturing (AM) technique. Indeed, deposition via cold spray is recently finding its path toward fabrication of freeform components since it can address the common challenges of powder-bed AM techniques including major size constraints, deposition rate limitations, and high process tem- perature. Herein, we prepared nickel-base superalloy Inconel 718 samples with a cold spray technique and compared them with similar samples fabricated by selective laser melting. The samples fabricated using both methods were characterized in terms of mechanical strength, microstructural and porosi- ty characteristics, Vickers microhardness, and residual stress distribution. Different heat treatment cycles were applied to the cold spray samples in order to enhance their mechanical characteristics. The obtained data confirm that the cold spray technique can be used as a complementary AM method for fabrication of high-quality freestanding components where higher deposition rate, larger final size, and lower fabrication temperatures are desired (Fig. 1). Fig. 1 — SEMmicrograph of Inconel 718 powder used for fabrication of both cold spray and selective laser melting samples. ASSESSING RELIABILITY OF COLD SPRAY SPUTTER TARGETS IN PHOTOVOLTAIC MANUFACTURING Kedar Hardikar, Johannes Vlcek, Venkata Bheemreddy, and Daniel Juliano Cold spray has been used to manufacture more than 800 Cu-In-Ga (CIG) sputter targets for deposition of high-efficien- cy photovoltaic thin films. It is a preferred technique since it enables high deposit purity and transfer of non-equilibrium alloy states to the target material. In this work, an integrated approach to reliability assessment of such targets with deposit Fig. 2 — Stud-pull testing for adhesion and adaptation for cylindrical surface: adaptation for cylindrical substrate.