Investigation of Post-weld Heat Treatment of Laser Welded Ti6Al4V Materials

Abstract

In this study, the changes in the internal structure and mechanical properties of laserwelded Ti6Al4V material after the heat treatment process were experimentally investigated. The transformation temperatures of the α and β phase structures of the Ti6Al4V material influenced the heat treatment temperatures. Optical microscopes, XRD, and SEM experiments were performed to detect the microstructural change. Tensile and hardness tests were also carried out to determine the change in mechanical values. The experimental study determined that the mechanical values of laser-welded Ti6Al4V material improved after the heat treatment process. It was determined that ductility and strength increased significantly at heat treatment temperatures above the β phase temperature value. It was observed that the Widmanstatten morphology visible in the weld area increased the hardness.