Effect of Hot Isostatic Pressing on the Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Fabricated by Selective Laser Melting

The effect of hot isostatic pressing（HIP） on the microstructure and mechanical properties of Ti-6 Al-4 V alloy fabricated by selective laser melting（SLM） was studied.The results show the original acicular structure grows up rapidly along the length and width directions.Then the growth is hindered by interlaced α phase in the length direction and continues in the width direction.The structure transforms into short rod-like α phase at last.And α phase inherits the morphologies of destressing in the length direction and the width increases for the samples with destressing and HIP after SLM.The tensile strength and yield strength are lowered and the elongation is increased after HIP.The mechanical properties are not affected obviously with adding process of destressing.