Effects of Laser Polishing on Surface Characteristics and Wettability of Directed Energy-Deposited 316L Stainless Steel

Autor(es)

Souza, Adriel Magalhaes ^[1] ; Ferreira, Rodrigo ^[2] ; Barragan, German ^[3] ; Nunez, Johan Grass ^[1] ; Mariani, Fabio Edson ^[1] ; da Silva, Eraldo Jannone ^[1] ; Coelho, Reginaldo Teixeira ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Sao Carlos, SP - Brazil

^[2] Fed Inst Pernambuco, Dept Control & Ind Proc, Recife, PE - Brazil

^[3] Univ Pontificia Bolivariana, Grp Invest Ingn Aeroespacial, Fac Ingn Aeronaut, Circular 1 70-01, Medellin, Mde - Colombia

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Engineering and Performance; v. 30, n. 9, SI, p. 6752-6765, SEP 2021.
• Citações Web of Science: 0

Resumo

Directed energy deposition (DED) is one of the most used additive manufacturing processes for the fabrication of 3D-metal components. However, surface quality is not always within the limits required for most applications. Post-processing operations can overcome such a limitation. Laser polishing (LP) can be performed with the use of a same energy source and same gripping position, thus improving both surface roughness and functional characteristics (e.g., wettability). However, the literature lacks studies on the process parameters and their influence on roughness and wettability characteristics. This article investigates the influence of LP on surface roughness and wettability of AISI 316L SS produced by DED and proposes equations that predict surface roughness and remelted layer thickness (RLT) as a function of laser power (P). The surfaces were characterized by metallographic analysis, microhardness, surface roughness parameters (S-a, S-z, S-ku, and S-sk), and contact angle. The results showed a reduction of up to 86% in S-a, and the S-z/S-a ratio as a P-function was correlated to a surface improvement. S-ku and S-sk help to better characterize the surface, thus affecting its wettability. The RLT displayed a linear and P-dependent behavior. No alteration in the microstructure/microhardness was observed after the LP. (AU)

• Processo FAPESP: 19/10758-4 - Estudo e desenvolvimento do pós-processamento de peças metálicas obtidas por manufatura aditiva: aplicação do fresamento e retificação em elevadas velocidades de corte e do processo de acabamento magnético-abrasivo
• Beneficiário: Adriel Magalhães Souza
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 19/26362-2 - Estudo de revestimentos de carboneto de tungstênio (WC) produzidos por DED Direct Energy Deposition em aços AISI H13 e 4140
• Beneficiário: Fábio Edson Mariani
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/11309-0 - Estudo, desenvolvimento e aplicação de processo híbrido: Manufatura Aditiva (Ma) + High Speed Machining/Grinding (HSM/G)
• Beneficiário: Reginaldo Teixeira Coelho
• Modalidade de apoio: Auxílio à Pesquisa - Temático