Influence of a Femtosecond Laser Surface Modification on the Fatigue Behavior of Ti-6Al-4V ELI Alloy

Author(s)

dos Santos, Alan ^[1] ; Campanelli, Leonardo Contri ^[1] ; Carvalho Pereira da Silva, Paulo Sergio ^[1] ; Vilar, Rui ^[2] ; Martins de Almeida, Maria Amelia ^[2] ; Kuznetsov, Alexei ^[3] ; Achete, Carlos Alberto ^[3] ; Bolfarini, Claudemiro ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Engn Mat, Rod Washington Luiz Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Inst Super Tecn, Dept Engn Quim, Av Rovisco Pais, P-1049001 Lisbon - Portugal

^[3] Inst Nacl Metrol Qualidade & Tecnol INMETRO, Div Metrol Mat, Av Nossa Senhora das Gracas 50, BR-25250020 Duque De Caxias, RJ - Brazil

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 22, n. 4 2019.
• Web of Science Citations: 0

Abstract

The objective of this investigation was to evaluate the influence of surface modification by femtosecond laser (with average fluence of 0.6 J/cm2 and scanning speed of 0.1 mm/s) on the fatigue resistance of Ti-6Al-4V ELI alloy. A significant reduction in the fatigue strength of the material modified by laser was observed. Residual tensile stresses generated during surface modification were negligible, presenting lower values than those found on the unmodified surface. Based on a recently developed and published prediction model, the reduction of the fatigue strength was ascribed to the surface roughness created during the laser treatment of the alloy. An evidence was that the fatigue crack nucleation occurred in the modified region, rather than at the edge of the rectangular specimens as in the untreated condition. (AU)

• FAPESP's process: 16/12995-5 - Fatigue of a metastable beta titanium alloy for application as biomaterial
• Grantee: Leonardo Contri Campanelli
• Support Opportunities: Scholarships in Brazil - Post-Doctoral