Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EVALUATION OF FATIGUE RESISTANCE OF TI-6AL-4V AFTER THERMAL TREATMENT
Submission Author:
Marcio Silva , SP
Co-Authors:
Marcio Silva, RENATO CHAVES SOUZA, Roberto Duarte
Presenter: Marcio Silva
doi://10.26678/ABCM.COBEM2017.COB17-2530
Abstract
The selection of a material for structural application in the aerospace industry must take into account several factors. These factors include mechanical resistance, resistance to fatigue crack propagation, and resistance to weight ratio. Titanium alloy with 6% aluminum and 4% vanadium is often used in the aerospace industry to meet the structural requirements of aircraft. There is a need to determine how this new material behaves after heat treatments, since in the industry thermal treatments are often used to enhance some of the material's characteristics. This work proposes to obtain the rotation flexion fatigue curves for different microstructures in the thermal treatment curve of the Ti-6Al-4V alloy before and after a solubilization thermal treatment, which provides different values of microhardness. The material was supplied by an aerospace company that uses this material in the form of parts stamped on the structure behind the aircraft fuselage. The material passed through the thermal treatment of solubilization and its microstructure and its microhardness were evaluated. Afterwards, it was machined to perform the fatigue tests by rotary bending, in order to acquire the tension graph by number of cycles until the rupture. Different microstructures and microhardnesses were obtained, for example the bimodal microstructure (α + β) and α-Widmanstatten with microhardness of 358.7 HV and 330.9 HV respectively. The values obtained with the flexural fatigue curves were analyzed and compared.
Keywords
titanium, Thermal treatment, fatigue, microstructures.
