Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Numerical simulation of the thermal behavior in the deposition of a multilayer wall of steel AISI 316 by DED-PTA
Submission Author:
Rodrigo Aparecido da Silva , PR , Brazil
Co-Authors:
Rodrigo Aparecido da Silva, Heber Abreu Castillo, Ana Sofia D'Oliveira, Americo Scotti
Presenter: Rodrigo Aparecido da Silva
doi://10.26678/ABCM.COBEM2023.COB2023-1582
Abstract
Structural projects require knowledge of the mechanical properties of the material to be used. This requirement can be challenging when metal additive manufacturing processes are used, which consist of the progressive deposition layer by layer of material until the desired geometry is obtained, manufacturing the material simultaneously with the manufacture of the part. In this context, the thermal cycles and the properties of the additive material are dependent on each process and the processing parameters used (electric current, flow rate and deposition speed) will determine the thermal behavior during the deposition of the multilayers, which will impact the microstructure, which in turn, affects the mechanical properties. In this sense, it is of great relevance to map the thermal behavior in the processing of additive materials. This study is part of a research under development that aims to understand the effect of processing parameters (speed, mass flow rate and deposition current) on the characteristics of thermal cycles to which AISI 316L steel is exposed during the deposition of a wall multilayer with unidirectional trajectory. This stage of the research is using numerical simulation to identify the correlation between these process variables and the characteristics of the thermal cycles to which the deposited material is exposed. Simulation results show that during the processing of the multilayer wall, for each deposited layer, there is a volume of material that is heated and that depends on the processing parameters. However, when entering steady state, this volume is constant and follows the growth of the wall height. In particular, an increase in electrical current directly influences the heated volume while an increase in torch speed and material flow, respectively, reduces the volume of previously deposited material affected by the deposition thermal cycle. A direct consequence of this analysis are the distinct changes that the microstructure can present and that can impact the post-processing heat treatment and consequently the properties of the material processed by AM.
Keywords
Additive Manufacture, PTA, Computational simulation
