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

Autor: Fábio Edson Mariani, Eraldo Jannone da Silva, Adriel Magalhães Souza, Johan Grass Nuñez, Rodrigo Jose Ferreira, Reginaldo Teixeira Coelho, German Barragan
Rok vydání: 2021
Předmět:
Zdroj: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
ISSN: 1544-1024
1059-9495
Popis: 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 (Sa, Sz, Sku, and Ssk), and contact angle. The results showed a reduction of up to 86% in Sa, and the Sz/Sa ratio as a P-function was correlated to a surface improvement. Sku and Ssk 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.
Databáze: OpenAIRE
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