Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Comparative analysis between joining stacking based laser micro spot welding (JS-LMSW) and laser powder bed fusion (LPBF) for guided bone regeneration(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2024-01) Morales Fierro, Alan Giovanni; Sandoval Robles, Jesús Alejandro; mtyahinojosa, emipsanchez; Cedeño Viveros, Luis Daniel; Rodríguez García, Aída; School of Engineering and Sciences; Campus Monterrey; García López, ErikaDental devices, such as periodontal membranes used in the Guided Bone Regeneration (GBR) treatment, need to be manufactured with specific requirements to reach the quality desired. In this project, a periodontal membrane was manufactured by Joining Stacking Based Laser Micro Spot Welding (JS-LMSW) and Laser Powder Bed Fusion (LPBF). The objectives of this project were to design a periodontal membrane based on an imaged-based tomography, to identify the parameters for JS-LMSW and LPBF, and to characterize dimensionally the membranes. For JS-LMSW, an experimental design was carried on by changing parameters such as time exposure (1, 4, 7, 10 ms) and power (160, 180, 200 W). It was observed that the samples with the best quality profile were 160W/1ms, 180W/7ms, and 200W/10ms. For LPBF, it wasn’t possible to obtain the membrane with the original measurements. Also, all the periodontal membrane samples were electropolished. It was possible to design a periodontal membrane from a real case, the parameters of JS-LMSW were identified, and electropolishing improved dimensionally some measurements of the membrane.
- Impact of powder recycling strategy on additively manufactured Inconel 718 parts using LPBF-M(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2024) García Faustino, Litzy Lilián; Ulloa Castillo, Nicolás Antonio; mtyahinojosa, emipsanchez; Segura Cárdenas, Emmanuel; Vázquez Lepe, Elisa Virginia; Ramírez Cedillo, Erick Guadalupe; School of Engineering and Sciences; Campus Monterrey; Ruiz Huerta, LeopoldoLaser powder bed fusion for metals (LPBF-M) has been key not only to manufacture parts with complex designs, but also to optimize the use of the powder material involved in the process. The latter has encouraged the investigation of recycling strategies based on the reuse of the metal powder not consumed in a previous building cycle. However, a constraint about such strategies is that the structural and morphological properties of the metal powder can be modified due to the thermal phenomena induced by the laser, which can impact negatively on the physical properties of the manufactured part. For this reason, and with the aim of validating the implemented recycling strategy it is desirable to explore analytical methodologies capable of assessing the morphological evolution of metal powder and the microstructural evolution of the manufactured parts, among others. This thesis report on the microstructural evolution of Inconel 718 parts manufactured by LPBF-M process using a recycling strategy which consisted of filling up the missing and the solidified powder with virgin one (80 cm3) along 22 building cycles. The evolution of crystal structure for built parts and sieved powders was investigated by XRD through the analyses of the main crystalline phases (𝞬, 𝞬´ and 𝞬´´) and their peak positions. The presence of recycled powder from previous building cycles was identified by two means, a shifting of the peak positions and the precipitations detected. Both are caused by the constant interaction between metal powder and laser. The crystalline phase transformation between 𝞬´ and 𝞬´´ was assessed by a Rietveld analysis along the building cycles. The distribution of grains and, in general, the microstructural evolution was evaluated by SEM and energy dispersive spectroscopy (EDS) for elemental mapping analyses. The findings of this research contribute not only to understand impact of reusing metal powder for built parts, via the study of crystal structural evolution and its influence in their physical properties, but also determining viable routes to optimize the storage of powder by estimating its effective lifetime when used for consecutive building cycles.