A Study on the Process, Microstructure, and Properties of Laser Additive Manufacturing of Titanium Alloys

To eliminate lack-of-fusion (LoF) defects at partition interfaces during laser powder bed fusion of titanium alloys, this study proposes a multi-layer, partitioned-scanning strategy with staggered interfaces. The strategy was optimized through an orthogonal experimental design focused on single-track morphology. Experimental results indicate that this approach effectively suppresses defects in quadrant-partitioned samples, significantly improving the relative density from 93.6% to 97.9%. In addition, the strategy markedly refines the microstructure and enhances microhardness. Mechanical testing confirms that the fabricated components achieve performance comparable to those produced by conventional continuous scanning.