Fig. 1. Simulated melt pool width under different speeds. (a) 57.5 W/237.5 mm·s^-1; (b) 115 W/475 mm·s^-1; (c) 230 W/950 mm·s^-1; (d) 290 W/1200 mm·s^-1

Fig. 2. Simulated melt pool depth under different speeds. (a) 57.5 W/237.5mm·s^-1; (b) 115 W/475 mm·s^-1; (c) 230 W/950 mm·s^-1; (d) 290 W/1200 mm·s^-1

Fig. 3. Micrographs of ZOY surface. (a) 230 W/950 mm·s^-1; (b) 290 W/1200 mm·s^-1

Fig. 4. Micrographs of unetched samples. (a) 230 W/950 mm·s^-1; (b) 290 W/1200 mm·s^-1