Constitutive Modeling of Beta Titanium Alloy Ti-10V-4.5Fe-1.5Al during Hot Deformation Process

Abstract:

A constitutive model using dislocation density rate as an internal state variable has been proposed for hot working of β titanium alloy in this paper. The β phase was only taken into consideration during high temperature deformation. The solution strengthening and dislocation interaction were included in the constitutive equations. The strength coefficient was determined by equivalent vanadium content, V_eq, which was calculated according to the alloy constituent. A Kocks-Mecking model was adopted to describe the variation of dislocation density. The constitutive relationship of a β titanium alloy Ti-10V-4.5Fe-1.5Al for high temperature deformation was established using the internal-state-variable based model. Model parameters were determined by the genetic algorithm based objective optimization method. The predicted results agree fairly well with the experimental value.

• Periodical: Advanced Materials Research (Volume 510)
• Pages: 729-733
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.510.729
• Online since: April 2012
• Authors: Feng Bo Han, Jin Shan Li, Hong Chao Kou, Bin Tang, Min Jie Lai, Hui Chang
• Keywords: Constitutive Model, Dislocation Density, Flow Stress, Hot Deformation, β Titanium Alloy

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