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Abstract(s)
Esta dissertação tem como objetivo o estudo do efeito da deposição multicamada e dos parâmetros de processo nas características metalúrgicas e mecânicas de componentes metálicos produzidos com recurso a métodos de fabrico aditivo, nomeadamente o 3DPMD. O 3DPMD é um método de fabrico aditivo de metais bastante recente que tem por base o processo clássico de arco plasma, combinando-o com um braço robótico de CNC. Tal como os restantes processos de deposição direta de energia (DED), o 3DPMD permite a criação de geometrias complexas, sem grandes desperdícios, por deposição de material metálico fundido camada-a-camada. No entanto, a falta de apoios na produção de componentes e a existência de ciclos térmicos aplicados nas diversas camadas tornam este método complexo, sendo necessária a correta escolha dos parâmetros de impressão para a produção de componentes de elevada qualidade. De forma a fazer uma correta caracterização do processo, foram produzidas deposições de paredes finas e deposições em degrau, aplicando três conjuntos de parâmetros distintos. Pela análise da microestrutura, pesquisa de defeitos por radiografia, medição da microdureza e avaliação da componente geométrica e estrutural, foi possível definir a condição 66 como a combinação de parâmetros ótima para o controlo do processo e produção de geometrias.
This dissertation aims to study the effect of multilayer deposition and process parameters on the metallurgical and mechanical characteristics of metallic components produced using additive manufacturing methods, namely 3DPMD. 3DPMD is a recent metal additive manufacturing method that is based on the classical plasma arc process, combining it with a CNC robotic arm. Like the remaining direct energy deposition (DED) processes, 3DPMD allows the creation of complex geometries, without much waste, by deposition of layer-by-layer molten metal material. However, the lack of support in the production of components and the existence of thermal cycles applied in the various layers make this method complex, requiring the correct choice of printing parameters to produce high quality components. To make a correct characterization of the process, thin-wall deposition and step deposition were produced, applying three different sets of parameters. By analyzing the microstructure, searching for defects by radiography, measuring the microhardness and evaluating the geometrical and structural component, it was possible to define condition 66 as the optimal parameter combination for process control and geometry production.
This dissertation aims to study the effect of multilayer deposition and process parameters on the metallurgical and mechanical characteristics of metallic components produced using additive manufacturing methods, namely 3DPMD. 3DPMD is a recent metal additive manufacturing method that is based on the classical plasma arc process, combining it with a CNC robotic arm. Like the remaining direct energy deposition (DED) processes, 3DPMD allows the creation of complex geometries, without much waste, by deposition of layer-by-layer molten metal material. However, the lack of support in the production of components and the existence of thermal cycles applied in the various layers make this method complex, requiring the correct choice of printing parameters to produce high quality components. To make a correct characterization of the process, thin-wall deposition and step deposition were produced, applying three different sets of parameters. By analyzing the microstructure, searching for defects by radiography, measuring the microhardness and evaluating the geometrical and structural component, it was possible to define condition 66 as the optimal parameter combination for process control and geometry production.
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Keywords
3DPMD Deposição multicamada Microestrutura Fabrico Aditivo Multilayer deposition Microstructure Additive Manufacturing