Study on Hot Deformation Behavior of Ti-6Al-4V-0.1B Alloy with Equiaxed Microstructure

摘要

Isothermal compression of Ti-6Al-4V-0.1B alloy was carried out at deformation temperature of 850-980°C, strain rate of 0.01~(-1)s~(-1), and maximum height reduction of 60% with Gleeb1500D simulator. The equation between flow stress and strain was gotten for plastic deformation. It shows that the peak flow stress and steady stress were sensitive to the strain rate and temperature except low strain rate and above 950°C. The activation energy of deformation was obtained in isothermal compression of Ti-6Al-4V-0.1B alloy was 578.29KJ/mol in (α+β) region. The constitutive equation which describes the relationship between the flow stress as a function of strain rate, strain, and deformation temperature were established by adopting the Arrhenius equation: ε=3.22×10~(24)sinh~(3.29527)(0.0107σ) exp (-578290/RT).