Results and Discussion
Temperature Distribution on the Slab Surface
Figure 3 shows the temperature field of strand surface under different mold corner structure: (a) right-angle, (b) big-chamfer, (c) multi-chamfer and (d) fillet. It is obvious that the temperature distribution on the wide face of the four kind of strand is very close. The mold corner structure has little influence on the temperature field on wide face. The temperature distribution on narrow face is a little different from that on wide face. On the lower part of narrow face, the temperature distribution is non-uniform due to the nozzle jet. Under the influence of corner structure, the temperature near mold exit of big-chamfered strand is about 50 K higher than that
Fig. 3 The temperature field of strand surface under different mold corner structure: a right-angle, b big-chamfer, c multi-chamfer, d fillet
of right-angle strand. And the temperature of multi-chamfered and fillet strand is about 50 K higher than that of big-chamfered strand as well.
On the chamfered face, the temperature distribution presents significant differences. The temperature around the corner is lower than that of wide face and narrow face. The corner temperature of right-angle strand is the lowest because of the 270° heat transfer. The lowest corner temperature of right-angle, big-chamfered, multi-chamfered and fillet strand is 1224, 1437, 1447 and 1447 K, respectively. It means that the using of chamfered mold will promote the corner temperature obviously. While the corner structure changed from big-chamfer to multi-chamfer, the rise of corner temperature is relatively small. Moreover,the corner temperature of multi-chamfered strand and fillet strand is almost the same.