Browsing by Author "La Fe-Perdomo, Ivan"
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- ItemA novel optimization framework for minimizing the surface roughness while increasing the material processing rate in the SLM process of 316L stainless steel(2023) La Fe-Perdomo, Ivan; Ramos-Grez, Jorge Andres; Quiza, Ramon; Jeria, Ignacio; Guerra, CarolinaPurpose - 316 L stainless steel alloy is potentially the most used material in the selective laser melting (SLM) process because of its versatility and broad fields of applications (e.g. medical devices, tooling, automotive, etc.). That is why producing fully functional parts through optimal printing configuration is still a key issue to be addressed. This paper aims to present an entirely new framework for simultaneously reducing surface roughness (SR) while increasing the material processing rate in the SLM process of 316L stainless steel, keeping fundamental mechanical properties within their allowable range.
- ItemAnalytical and Machine Learning-based approaches to estimate the steady-state temperature limit on the surface of Cu powder beds when heated by a concentrated laser energy source(2022) Ramos Grez, Jorge; La Fe-Perdomo, Ivan; Larrain, Tomas
- ItemKerf profile analysis and neural network-based modeling of increasing thickness PMMA sheets cut by CO2 laser(2021) Lohr, Cristobal; La Fe-Perdomo, Ivan; Ramos Grez, Jorge; Calvo, Javier
- ItemMicrostructural differences and mechanical performance of stainless steel 316L conventionally processed versus a selective laser melted(2024) Barrionuevo, German Omar; La Fe-Perdomo, Ivan; Ramos-Grez, Jorge A.; Walczak, Magdalena; Mendez, Patricio F.Metal additive manufacturing (AM) has changed materials design and processing paradigms. However, as it is a layered manufacturing process and due to the complex material-laser interaction, the resulting microstructure differs from conventional counterpart alloys. Since the mechanical properties depend on the microstructure, the functional properties of mechanical components manufactured by laser powder bed fusion (LPBF) thus are significantly influenced by the processing parameters and the scanning strategy. The present research is focused on the microstructure differences between 316L stainless steel processed by LPBF and conventionally processed. Several characterization techniques were employed in this assessment, including optical and electron microscopies, X-ray diffraction, and spectrometry. A finite element analysis (FEA) was conducted to study grain boundaries and orientation and determine the thermal gradient and cooling rate. Moreover, welding-based algebraic models were used to calculate the cooling rate and the cell spacing. The FEA results show good agreement in the prediction of microstructural features, while the algebraic results values are of the same order of magnitude, with a relative error of less than 5% in determining the cell spacing (0.57 mu m). The additively manufactured specimen shows approximately the same ultimate tensile strength (622 MPa); however, a 40% increase in yield strength (532 MPa) and a higher microhardness is observed.
- ItemMicrostructure and Mechanical Properties of Cu-11Al-5Ni-4Fe wt% Manufactured by LPBF(2023) Guerra, Carolina; Ramos Grez, Jorge; La Fe-Perdomo, Ivan; Castillo, Alejandro; Walczak, Magdalena
- ItemPredicting the evolution of static yield stress with time of blended cement paste through a machine learning approach(2023) Navarrete, Ivan; La Fe-Perdomo, Ivan; Ramos Grez, Jorge; Lopez, Mauricio
- ItemSimultaneous Optimization of Surface Roughness and Mechanical Properties of 316L Produced by LB-PBF Using Grey Relational Analysis Complemented by Residual Stress Analysis(2023) La Fe-Perdomo, Ivan; Ramos Grez, Jorge; Jeria, Ignacio; Guerra, Carolina; Zambrano-Robledo, Patricia
- ItemTENSILE/COMPRESSIVE RESPONSE OF 316L STAINLESS STEEL FABRICATED BY ADDITIVE MANUFACTURING(2024) Barrionuevo, German Omar; La Fe-Perdomo, Ivan; Caceres-Brito, Esteban; Navas-Pinto, WilsonAdditive manufacturing has evolved from a rapid prototyping technology to a technology with the ability to produce highly complex parts with superior mechanical properties than those obtained conventionally. The processing of metallic powders by means of a laser makes it possible to process any type of alloy and even metal matrix composites. The present work analyzes the tensile and compressive response of 316L stainless steel processed by laser-based powder bed fusion. The resulting microstructure was evaluated by optical microscopy. Regarding the mechanical proppercentage of elongation before breakage, compressive strength and microhardness were determined. The results show that the microstructure is constituted by stacked micro molten pools, within which cellular sub-grains are formed due to the high thermal gradient and solidification rate. The compressive strength (1511.88 +/- 9.22 MPa) is higher than the tentest, the hardness increased by 23%.