RT info:eu-repo/semantics/article
T1 Laser Defocusing Effect on the Microstructure and Defects of 17-4PH Parts Additively Manufactured by SLM at a Low Energy Input
A1 Leo, Paola
A1 Cabibbo, Marcello
A1 Del Prete, Antonio
A1 Giganto Fernández, Sara
A1 Martínez Pellitero, Susana
A1 Barreiro García, Joaquín
A2 Ingenieria de los Procesos de Fabricacion
K1 Ingenierías
K1 Characterization
K1 Hardness
K1 Iron alloy
K1 Laser defocusing
K1 Microstructure evolution
K1 Selective laser melting
K1 2209.10 láseres
AB [EN] In this paper, the microstructure, defects, hardness, and tensile strength of the 17-4PH specimens manufactured additively using the selective laser melting (SLM) technique were studied. The analyzed parts (10 mm size cubic specimens and tensile specimens) were manufactured with different defocus parameter values (−1, 0, +1 mm) in order to evaluate this effect with a low power laser (38 W). The study was carried out on three different sections of each cubic specimen, one perpendicular to the laser beam or SLM manufacturing direction (transversal section), and another two parallel to the laser beam direction (longitudinal sections). The specimens microstructures were analyzed with an X-ray diffraction technique, as well as optical, scanning electron, and transmission electron microscopes. Image J software was used to characterize the defects and phase ratio. In addition, hardness and tensile tests were performed according to the corresponding standards. The results show that the amount of austenitic phase and the average grain size varied with defocusing. The percentage of defective area was less than 0.25%. The analyzed defocus distance did not affect the number and average size of the defects. Adjusting the defocusing SLM parameter is important for manufacturing parts with good mechanical properties.
PB MDPI
LK https://hdl.handle.net/10612/18103
UL https://hdl.handle.net/10612/18103
NO Leo, P., Cabibbo, M., Prete, A. Del, Giganto, S., Martínez-Pellitero, S. & Barreiro, J. (2021). Laser defocusing effect on the microstructure and defects of 17-4ph parts additively manufactured by slm at a low energy input. Metals, 11(4), 588. https://doi.org/10.3390/met11040588
DS BULERIA. Repositorio Institucional de la Universidad de León
RD 11-may-2024