Corrosion-Fatigue of alloys AA 2524-T3 considering base metal and welding metal: friction stir welding process ("FSW")

• Grant number: 18/25000-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: March 01, 2019
• End date: January 31, 2020
• Field of knowledge: Engineering - Materials and Metallurgical Engineering
• Principal Investigator: Waldek Wladimir Bose Filho
• Grantee: Gabriel Scherma de Carvalho
• Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

The international market competitiveness growth makes big companies search for alternatives for the improvement of their products. In the aeronautic context, one of the great challenges faced by aircraft designers consists of weight reduction and improvement in the strength of fuselage materials, situations that we highlight the problem of the riveting process. That mechanical elements create a region susceptible to fatigue crack nucleation and propagation for being locals with microstructural defects and stress concentration. The use of methods like a friction stir welding, or simply "FSW", appears as an alternative for improvement of fatigue resistance by reducing the problems previously mentioned. This way, in order to complement the research about the fatigue resistance to friction stir welding in aluminum alloys, this study aims to determine the features of corrosion-fatigue of the base material and the regions of the weld FSW in the alloy AA 2524-T3 used on the wing-fuselage, analyzing the factors acting on the resistance to propagation crack in air and salt spray. It will be also evaluated the interaction of the microstructure with the environment by the analysis of crack path using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). Besides, will be made the observation of crack propagation micromechanisms by fracture surface analysis SEM, using secondary eléctron technique, SE.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MORETO, J. A.; DOS SANTOS, M. S.; FERREIRA, M. O. A.; CARVALHO, G. S.; GELAMO, V, R.; AOKI, V, I.; TARYBA, M.; BOSE FILHO, W. W.; FERNANDES, J. C. S.. Corrosion and corrosion-fatigue synergism on the base metal and nugget zone of the 2524-T3 Al alloy joined by FSW process. Corrosion Science, v. 182, APR 15 2021. (18/25000-7)