Open AccessEstablishment of Constitutive Equation of Hot Deformation of Ti-6Al-4V-0.1B alloy with Widmannstätten structure
Author(s) -
Yang Yu,
Zhongyuan You,
Hongxing Hu,
Wanjing Yu
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/544/1/012059
Subject(s) - flow stress , strain rate , materials science , deformation (meteorology) , constitutive equation , stress (linguistics) , compression (physics) , arrhenius equation , strain (injury) , hot working , composite material , softening , alloy , atmospheric temperature range , activation energy , metallurgy , thermodynamics , physics , chemistry , medicine , linguistics , philosophy , organic chemistry , finite element method
In order to study the hot deformation behavior of the Ti-6Al-4V-0.1B alloy with Widmannstätten structure and obtain its constitutive equation,the Ti-6Al-4V-0.1B alloy cylindrical specimens with size of Φ8 × 12mm were prepared for the hot compression test on the Gleeble-1500 simulation machine,the deformation temperature from 850 to 980°Cand strain rates of 0.01 to 1s-1.The true stress-strain data and curves were obtained from the hot compression test.The results show that the true stress-strain curves of Ti-6Al-4V-0.1B alloy with Widmannstätten structure have the characteristics of flow stress softening and the flow stress is sensitive to temperature and strain rate.At the same temperature, flow stress increase with the strain rate.At the same strain rate, flow stress decrease with the temperature.Through regression analysis of true stress and strain data by Arrhenius hyperbolic sine function, the activation energy Q is calculated, 890.49kJ/mol.Under the range of the experimental deformation temperatures and strain rates, the constitutive equation is σ=11.36ln{(Z/e 88.47 ) 1/4.4107 +[(Z/ e88.47 ) 2/4.4107 +1] 1/2 }.