Eventos Anais de eventos
COBEF 2023
12th Brazilian Congress on Manufacturing Engineering
EFFECT OF LASER POWER AND POWDER MORPHOLOGY ON SURFACE ROUGHNESS OF TI6Al4V PRODUCED BY LASER POWDER - DIRECTED ENERGY DEPOSITION
Submission Author:
Geovana Eloizi Ribeiro , SP
Co-Authors:
Geovana Eloizi Ribeiro, Vincent Wong, Willian Valicelli Sanitá, Alessandro Rodrigues, Reginaldo Coelho
Presenter: Geovana Eloizi Ribeiro
doi://10.26678/ABCM.COBEF2023.COF23-0439
Abstract
Additive manufacturing of metals has emerged as a technology capable of producing complex metal parts in the "near net shape" format, performing repairs, and creating parts with gradient material, enabling manufacturing parts with high added value and low production. Directed Energy Deposition from Laser and Powder (LP-DED) is one of the categories of the additive manufacturing process by which concentrated thermal energy allows the metallic powder to melt. These applications have been attractive to different areas such as aerospace, automotive, and medical. In the medical field, its application has focused on creating implants, prostheses, instruments, and medical devices. In the creation of prostheses and implants, Ti6Al4V titanium alloys have stood out due to their properties of high mechanical strength, high corrosion resistance, low density, and, essentially, good biocompatibility. One of the literature challenges reflects the roughness given to printed parts by the LP-DED process, which can affect the osseointegration of prostheses and implants, linked to their recovery time and success. This article evaluates the roughness of Ti6Al4V parts obtained from the LP-DED process using two types of powder produced by two different processes. The first powder is produced by gas atomization, and advanced plasma atomization APAtm produces the second. Subsequently, eight specimens were fabricated by LP-DED on pure Ti substrate, four for each kind of powder. The laser power was another input variable ranging from 300 W to 345 with a 15W increment. Samples were cleaned with deionized water and acetone using ultrasonic vibration. Then, we evaluated the roughness of the samples using a confocal microscope. The powder morphology of the powders used showed that powder produced by gas atomization presented a distribution non-gaussian, with flakes, pores, and satellites. The powder produced by advanced plasma atomization showed a gaussian distribution, with fewer pores quantity and less presence of satellites and flakes when compared with gas atomization powder. The powder feed rate's precision was more efficient than the powder produced by APAtm. The Sa roughness obtained by APAtm powder showed values between 43.82 μm to 33.60 μm, and by gas atomization powder, the roughness obtained was between 40.80 μm to 23.07 μm. It evidences a lower roughness for the powder produced by gas atomization. This research showed that the laser power and the powder morphology play an important role in the roughness of the part, improving the quality of devices for medical applications.
Keywords
Directed Energy Deposition, Roughness, Ti6Al4V, Additive manufacturing
