Numerical simulation of hot hydrostatic extrusion of W-40 wt.% Cu

The relationship of stress vs. strain of W-40 wt.% Cu at different temperatures and strain rates is obtained by the true stress–strain data obtained from tests using a Gleeble1500 thermo-simulator. The friction factors without and with lubricant of oil and graphite are determined by ring upset experiments. The heat transfer of the billet in various conditions is simulated by DEFORM-2D, and the results are compared with the temperature–time data obtained from heat transfer tests to confirm the convection coefficient and the heat transfer coefficient between the billet and other materials in different states. Based on these works, the hot hydrostatic extrusion process of W-40 wt.% Cu is simulated. The results show that the calculated deformation loads during extrusion at different temperatures are in good agreement with the experimental results. The variation of the deformation load during hot hydrostatic extrusion process has been studied, and the distribution of temperature field, equivalent stress, equivalent strain and relative density of the billet are obtained.