Effects of laser power and speed on keyhole formation during additive manufacturing by laser-powder bed fusion

dc.creatorLANDGRAF, FERNANDO J.G.
dc.creatorMORAIS, WILLY A. de
dc.creatorGUZMAN, JHOAN
dc.creatorMARTORANO, MARCELO
dc.creatorNOBRE, RAFAEL de M.
dc.creatorNEVES, MAURICIO M. das
dc.creatorBRAZIL MRS MEETING, 19th; INTERNATIONAL UNION OF MATERIALS RESEARCH SOCIETIES - INTERNATIONAL CONFERENCE ON ELECTRONIC MATERIALS
dc.date2022-03-22T12:58:32Z
dc.date2022-03-22T12:58:32Z
dc.dateAugust 30 - September 3, 2021
dc.date.accessioned2023-09-28T14:21:29Z
dc.date.available2023-09-28T14:21:29Z
dc.identifierhttp://repositorio.ipen.br/handle/123456789/32831
dc.identifier0000-0002-1304-2117
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9003050
dc.descriptionUnique microstructures are generated by the laser powder bed fusion (L-PBF) process of additive manufacturing. The moving molten metal pool created by the laser beam leaves a metallographic evidence, here called melt pool profile. The melt pool profile is easily identified in many alloys owing to the severe segregation at the beginning of the epitaxial cellular solidification, on the border of the remelted zone. The resulting microstructure is associated with the laser scanning strategy used in building the piece. Twenty-four different conditions of laser beam speed and power were adopted for a bed of plasma atomized powder of a Nb-48% Ti alloy. Width and depth of the melt pool profiles in the top layer of all samples were analyzed by optical microscopy. For lower energy densities and faster laser scanning speeds, the shape of the melt pool profile is nearly parabolic. When the speed decreases, within a certain limit dependent on the laser power, the shape changes to a characteristic keyhole-type profile, with a larger depth to width ratio. The keyhole profile is due to the presence of a wide, shallow parabolic pool and a narrow and deep pool formed by a transient evaporation cavity. The experimental results are compared to the available literature.
dc.format656-656
dc.publisherAptor Software
dc.rightsopenAccess
dc.titleEffects of laser power and speed on keyhole formation during additive manufacturing by laser-powder bed fusion
dc.typeResumo de eventos cient??ficos
dc.coverageI
dc.localS??o Carlos, SP


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