Temperature profile and melt depth in laser powder bed fusion of Ti-6Al-4V titanium alloy

Abstract

In this paper, the prediction of temperature profile and melt depth for laser powder bed fusion (L-PBF) of Ti-6Al-4V titanium powder material was performed by numerically solving the heat conduction-diffusion equation using a finite difference method. A review of the literature in numerical modeling for laser-based additive metal manufacturing is presented. Initially, the temperature profile along the depth direction into the powder material is calculated for a stationary single pulse laser heat source to understand the transient behavior of the temperature rise during L-PBF. The effect of varying laser pulse energy, average power, and the powder material’s density is analyzed. A method to calculate and predict the maximum depth at which localized melting of the powder material occurs is provided.