Eventos Anais de eventos
COBEF 2017
Congresso Brasileiro de Engenharia de Fabricação
MECHANICAL BEHAVIOR OF THE TI-6AL-4V TITANIUM ALLOY WITH MICROSTRUCTURAL EVOLUTION MODELING UNDER HOT AND SUPERPLASTIC CONDITIONS
Submission Author:
Marcio Santos , PA , Brazil
Co-Authors:
Gilmar Batalha
Presenter: Marcio Santos
doi://10.26678/ABCM.COBEF2017.COF2017-0395
Abstract
The present work aims at evaluating and understanding the mechanical behavior of Ti-6Al-4V alloy under hot and superplastic forming conditions. Tensile tests were thus performed at temperature range from 650°C to 950°C at strain rates between 10-2 s-1 and 10-4 s-1. Three equiaxed microstructures each characterized by a different starting grain size (4.88 µm, 3.0 µm and 0.5 µm) are compared and allow to obtain an understanding on microstructure evolution under hot and superplastic forming conditions. An accurate material model with microstructural considerations is proposed. The model capabilities consider the grain size evolution that is influenced by the temperature and the deformation. The computed flow stresses strongly depend on the strain rate but also on the considered initial grain size. Temperature and strain rate conditions may lead to a strain hardening phenomenon in some cases. The comparison between the model response and experiment shows a good agreement for all the tests carried out on the Ti-6Al-4V.
Keywords
titanium, Mechanical behaviour, Microstructure, microstructural evolution, Ti-6Al-4V
