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7293 |
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Friday, May 06, 2022, Hall D 9:40 AM Additive Manufacturing |
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Metal knitting: A method to control morphology and properties in cold gas spray additive manufacturing |
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JAVIER Sanchez* / University of Barcelona, Spain Rodolpho Vaz / Thermal Spray Center. Department of Materials Science and Physical Chemistry, University of Barcelona, Spain Horacio Canales/ Centro de Ingeniería y Desarrollo Industrial (CIDESI), México Unai Ocaña/ Thermal Spray Center. Department of Materials Science and Physical Chemistry, University of Barcelona, Spain Irene Canno/ Thermal Spray Center. Department of Materials Science and Physical Chemistry, University of Barcelona, Spain |
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Cold Gas Spraying (CGS) is a thermal spray process capable to produce dense and thick coatings by the spraying of powders under high velocity and relative low temperature. The high efficiency of deposition and the thickness of each pass make possible the use of CGS to produce free standing parts, as an additive manufacturing process. Traditionally, CGS is performed spraying at an angle of 90º which ensures maximum deposition efficiency among other benefits. This, however, presents two main disadvantages when using CGS for additive manufacturing. First, by keeping the spraying angle constant, there is not much control on the final geometry of the part being built, and, second, the resultant part’s properties present anisotropy depending whether this property is measured along the spraying axe or not. In this work we present a method (Metal Knitting) that aims to help reducing both disadvantages. Metal Knitting is based on the performance of certain spraying movements that build near squared shapes step by step like in a knitting process. The principle of the method and examples are presented as well as some results on the anisotropy of 316L stainless steel freeform parts obtained by CGS process, measuring the tensile stress, hardness, and evaluating the microstructure on different directions of the material. The effect of thermal treatment on the material behavior was also investigated. |