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.
Kang et al. (Sat,) studied this question.