November 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 9 4 4 iTSSe TSS iTSSe TSS JTST HIGHLIGHTS FATIGUE BENDING BEHAVIOR OF COLD- SPRAYED NICKEL-BASED SUPERALLOY COATINGS A. Silvello, P. Cavaliere, A. Rizzo, D. Valerini, S. Dosta Parras, and I. Garcia Cano Cold-sprayed Ni-based superalloy coatings offer new possibilities for manufacturing and repairing damaged com- ponents, such as gas turbine blades or other parts of aircraft engines. This development shines a new light on the conven- tional additive manufacturing technologies and significant- ly broadens application fields of cold spray. The idea is that cold spray can contribute to improving the fatigue proper- ties of manufacturing and repaired components. This study deals with the analysis of the microstructural and mechanical properties of IN625 cold-sprayed coatings on V-notched car- bon steel substrate. Process conditions of 1000°C and 50 bar were employed to produce coatings in V-notched (60° and 90°) samples in order to evaluate the fatigue crack behavior of the sprayed material. The results achieved demonstrate that cold spray deposition and repair can contribute to resistance and to the increase in the global fatigue life of cracked structures (Fig. 1). A REVIEW ON SUSPENSION THERMAL SPRAY PATENTED TECHNOLOGY EVOLUTION Maniya Aghasibeig, Fariba Tarasi, Rogerio S. Lima, Ali Dolatabadi, and Christian Moreau Suspension thermal spray (STS) includes any thermal spray process that is based on injection of a suspension of solid particles in a liquid carrier into the gas jet, such as sus- pension plasma spray, suspension high-velocity oxy-fuel, and high-velocity suspension flame spray. This review is on the state of the art of the STS technology and includes an overview of the current patent situation including the number of patents published in English, patenting institutions, and invention do- mains. Apparatus and methods, feedstock, and new material systems and applications were identified as the three main domains of focus for the STS inventions. The presented pat- ents show a general perspective of the current situation and present the technology advancements in each domain. It also shows the potential of implementing this technology in new applications based on the needs of the thermal spray market through further technology development. (Fig. 2). T he Journal of Thermal Spray Technology (JTST), the official journal of the ASM Thermal Spray Society, publishes contributions on all aspects—fundamental and practical—of thermal spray science, including processes, feedstock manufacture, test- ing, and characterization. As the primary vehicle for ther- mal spray information transfer, its mission is to synergize the rapidly advancing thermal spray industry and related industries by presenting research and development efforts leading to advancements in im- plementable engineering applications of the technology. Articles from the June, August, and October issues, as select- ed by JTST Editor-in-Chief Armelle Vardelle, are highlighted here. In addition to the print publication, JTST is available online through springerlink.com. For more information, visit asminternational.org/tss. 10 Fig. 1 — Three-point bending setup. Fig. 2 — Schematic view of a suspension plasma spray systemwith radial injection.