Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
LASER DIRECTED ENERGY DEPOSITION (L-DED) OF AISI 410L: DEVELOPMENT OF AN OPERATIONAL MAP AND THE EFFECT PROCESSING PARAMETER ON THE BEAD GEOMETRY
Submission Author:
Jurandir Sousa , PA
Co-Authors:
Jurandir Sousa, Jhonattan Gutjahr, Anselmo Thiesen Junior, Henrique Santos Ferreira, Milton Pereira, Leandro João Da Silva
Presenter: Jurandir Sousa
doi://10.26678/ABCM.COBEM2021.COB2021-1878
Abstract
Martensitic stainless steel has been widely used in the Oil and Gas (O&G) industry due to its attractive combination of mechanical properties and corrosion resistance. A common application in O&G is in valves components with the long lead time to spared parts as a challenge, which could be translated into high costs. In this sense, additive manufacturing (AM) could be a potential solution to overcome this due to its unique ability to produce parts directly from a 3D model. Among several techniques for metal AM, laser-directed energy deposition (L-DED) stands out for its ability to manufacture large components with moderate geometrical complexity. However, to reach the level of maturity to the point of being applied in O&G, the L-DED technique must be fully mastered by users. Aiming to contribute to this field, the present paper deals with the parameter selection task on the L-DED of AISI 410L martensitic stainless steel. The experimental approach can be divided into two stages. Initially, the hardware capabilities (RPM Innovations Inc., model RPMI 535) were assessed, which was called “operational map”. Then, in a delimited area within the operational map, the effects of deposition parameters (laser power, travel speed, and powder feedrate) on geometric characteristics of single beads were assessed through a full factorial design of experiments. The results showed expanded maps for higher values of spot size and powder feedrate. The lower limit of the laser power was due to the tendency of lack of fusion, while the upper limit was attributed to the equipment capabilities. The travel speed lower limit was due to process instabilities and the upper limit was the continuous bead formation. About the effect of deposition parameters, travel speed showed a higher impact because for a given laser power and powder feedrate it changes both: energy density and powder amount per unit length. The powder feedrate exhibited more influence on the bead height, while the width was maintained almost the same, keeping the molten pool width similar. Finally, as higher the laser power the higher the bead height and width, with a higher powder catchment for the larger molten pool. Based on the presented results, it can be concluded that AM L-DED has a spread range of bead geometry possibilities by changing the deposition parameters. Further research will be focused on the construction of some preform aiming evaluating the microstructure and mechanical performance.
Keywords
O&G industry, Metal additive manufacturing, laser directed energy deposition (L-DED), AISI 410L martensitic stainless steel, operational map
