Heat treatment of DMLS Ti6Al4V(ELI) evinces a wide range of mechanical properties of the alloy depending on the heat treatment cycle adopted. This is due to the different aspects of microstructure such as phase fraction, grain size, texture and dislocation density, that vary with heat treatment. Other external factors, such as prevailing level of strain, strain rate and temperature, also affect the mechanical properties of the material. This paper presents the development of a theoretical model that couples the effects of strain rate, temperature, strain, grain size and initial dislocation density to describe the flow properties of DMLS Ti6Al4V(ELI). According to the model, higher initial dislocation densities result in a higher yield stress, low strain hardening and earlier saturation of flow stress. The model shows that the parabolic shape of the stress strain curve of the alloy is dictated by the initial dislocation density, generally a factor of grain size.