Mechanical behavior and texture prediction of Ti-6Al-4V based on elastic viscoplastic self-consistent modelling

17th International Conference on Textures of Materials

材料科学;物理学

Galan-Lopez, J.^1 ; Naghdy, S.^1 ; Verleysen, P.^1 ; Kestens, L.A.I.^1 ; Coghe, F.^2 ; Rabet, L.^2 ; Degrieck, J.^1

Dept. Materials Science and Engineering, Ghent University, Sint-Pietersnieuwstraat 41, Ghent

9000, Belgium^1

Dept. COBO, Royal Military Academy, Renaissance Avenue 30, Brussels

1000, Belgium^2

关键词: Computationally efficient;    Crystal plasticity models;    Effects of temperature;    Elastic viscoplastic;    Hexagonal crystal structure;    Quasi-static experiments;    Temperature sensitivity;    Viscoplastic self-consistent model;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/82/1/012027/pdf
DOI  :  10.1088/1757-899X/82/1/012027

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The goal of this study is to apply an elastic viscoplastic self-consistent crystal plasticity model to predict the texture evolution in a Ti-6Al-4V alloy which has a (mainly) hexagonal crystal structure. The model under consideration is an extension of the viscoplastic self-consistent model proposed by Lebensohn and Tome [1993] which has been adapted to account for elasticity and has been integrated with a new algorithm, making it more computationally efficient within an implicit FE scheme. The flow behavior of Ti-6Al-4V is strongly dependent on strain rate and temperature. To estimate the model parameters, the flow behavior of quasi-static experiments is used. A temperature sensitivity term has been introduced to correct the effects of temperature increase during the dynamic experiments. In order to have a meaningful rate sensitivity exponent, a value is calculated based on valid experimental data, rather than choosing an arbitrary large numerical value. In this way the behavior of Ti-6Al-4V is captured at different strain rates. Predictions of the model are compared to experimental data.