Evaluation of shot peening on the fatigue strength of anodized Ti-6Al-4V alloy

• Autor(a) principal: Costa, Midori Yoshikawa Pitanga
• Data de Publicação: 2006
• Outros Autores: Voorwald, Herman Jacobus Cornelis [UNESP], Pigatin, Walter Luis, Guimarães, Valdir Alves, Cioffi, Maria Odila Hilário [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S1516-14392006000100020; http://hdl.handle.net/11449/30578
• topic: fatigue; anodization; titanium; shot peening

The increasingly design requirements for modern engineering applications resulted in the development of new materials with improved mechanical properties. Low density, combined with excellent weight/strength ratio as well as corrosion resistance, make the titanium attractive for application in landing gears. Fatigue control is a fundamental parameter to be considered in the development of mechanical components. The aim of this research is to analyze the fatigue behavior of anodized Ti-6Al-4V alloy and the influence of shot peening pre treatment on the experimental data. Axial fatigue tests (R = 0.1) were performed, and a significant reduction in the fatigue strength of anodized Ti-6Al-4V was observed. The shot peening superficial treatment, which objective is to create a compressive residual stress field in the surface layers, showed efficiency to increase the fatigue life of anodized material. Experimental data were represented by S-N curves. Scanning electron microscopy technique (SEM) was used to observe crack origin sites.