Effect of hammer forging impact characteristics on the forming properties of Ti-6Al-4V alloy

It is a novel promising technology that the advantages of vibration are applied to the plastic forming process. This study is prompted by the effect of the number of blows and dwell time on the forming properties of forgings when hammer forging impact is considered as vibration excitation. Taking Ti-6Al-4V alloy as the research object, this study investigates the forging quality and strength-toughness through hammer forging experiments. Then, a numerical model is established and verified by experiments. The results show that increasing the number of blows at constant total dwell time can obviously decrease the cumulative damage, stress concentration and residual stress in forgings, while improving the uniformity of forging deformation, average grain size and residual stress distribution. In addition, the proportion of fine grains in the forging is also increased. The adjustment of hammer forging impact parameters from the perspective of vibration excitation is effective in improving the performance of forgings, which can provide a theoretical basis for the future development of advanced hammer forging technology.