The Effects of PWHT on Tensile Properties and Microstructures for Laser Welds of Ti-6Al-4V Alloys

Abstract

The annealing condition dependence on the weldability of Ti-6Al-4V ELI alloy was studied by means of the tensile test, hardness and microstructure analysis. The Ti-6Al-4V ELI plate with 1 mm plates were joined by the fiber laser welding under 2 kw laser power and 100 mm/s welding speed condition. Various PWHT (Postweld heat treatment) conditions were used to improve the formability of the welded titanium alloy. The results showed the solution treatment for the PWHT contributes on the homogeneous strength distribution from fusion zone to base material. This PWHT conditions were expected to minimize the degradation of the formability caused by the welding.

Investigation of Dynamic Recrystallization Phenomenon in Drawn Ti-6Al-4V Alloy

“…Titanium and its alloy have become attention in the recent year due to their superior mechanical properties, such as low density, susceptible to elevated temperature, good formability, heat treatable material, and excellent corrosion resistance determined by microstructure and chemical composition of the alloys [1][2][3][4][5][6][7][8][9][10]. In particular, Ti-6Al-4V is one of superior titanium α+β due to its capability to control and optimized microstructure to obtain the desired properties [2].…”