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

• Main Author: Costa,Midori Yoshikawa Pitanga
• Publication Date: 2006
• Other Authors: Voorwald,Herman Jacobus Cornelis, Pigatin,Walter Luis, Guimarães,Valdir Alves, Cioffi,Maria Odila Hilário
• Format: Article
• Language: eng
• Source: Materials research (São Carlos. Online)
• Download full: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392006000100020
• 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.