Overlapped Multipass Laser Transformation Hardening of Ti-6Al-4V Titanium Alloy Using Continuous Wave Rectangular Beam

Abstract

Overlapped multitrack laser transformation hardening (OMLTH) of Ti-6Al-4V titanium alloy of Grade 5 of 2 mm thickness sheet has been carried out using 2 kW Nd:YAG laser source with a CW rectangular beam of size 1×14 mm². The present research article intended to provide a profound understanding of the multipass laser hardening process of TI-6Al-4V titanium alloy, and to investigate the effect of rectangular laser beam process parameters i.e., the laser power, the scanning speed has been evaluated by means of experimental bead on trials. The overlapped multipass laser transformation hardening experiments were conducted using rectangular beam for the two selected process parameters: (1). Low laser process parameter (LLPP), LP=600 W, SS=600 mm/min, and (2). High laser process parameter (HLPP), LP=800 W, SS=800 mm/min. The minimum hardened depth of 63.6364 µm was observed for low laser process parameter. The results indicate that the hardened depth increases with increase in power density. The maximum hardened depth of 278.7879 µm was achieved for high laser process parameter with high power density. It has been seen that the depth of hardening increases with increase in laser interaction time with the material.

Cite this Article

Duradundi Sawant Badkar. Overlapped Multipass Laser Transformation Hardening of Ti-6Al-4V Titanium Alloy Using Continuous Wave Rectangular Beam. Journal of Materials & Metallurgical Engineering. 2017; 7(3): 35–42p.