Numerical and experimental investigation of process parameters in non-isothermal forward extrusion of Ti-6Al-4V

作者：Mirahmadi S Javid^*; Hamedi Mohsen

来源：International Journal of Advanced Manufacturing Technology, 2014, 75(1-4): 33-44.

DOI：10.1007/s00170-014-6108-9

• Non-isothermal extrusion
• Ti-6Al-4V
• Adiabatic temperature rise
• Extrusion force

Ti-6Al-4V is the most common Ti alloy that may be worked at supra or subtransus temperatures, conventionally or isothermally. In this article, the effect of extrusion process parameters and die geometry on the extrusion force and adiabatic temperature rise is investigated. The process is considered to be non-isothermal. The results show that the non-uniform effective strain field inside the workpiece generates more elongated grains near the surface of the extrudate. The results also indicate that the ram velocity has the highest effect on both extrusion force and adiabatic temperature rise. The study suggests that in non-isothermal extrusion of Ti-6Al-4V, die and billet temperatures have stronger effect on the extrusion force compared with the die angle. However, effect of the die angle on the adiabatic temperature rise is considerable and cannot be neglected. Effect of the billet temperature on adiabatic temperature rise is more than the effect of die angle. The simulation model and analytical results are verified by experimental investigations that shows good agreement between the corresponding results. The provided insights using the approach and the results presented in this article gives a better understanding of forward extrusion of Ti-6Al-4V material. The results can be used by the tool designers and process planners in developing the tools and the processes that gives better yield and reduces the manufacturing costs.

• 出版日期2014-10