| Title |
Refinement of Primary Silicon Crystals by Sulphur Addition in Hypereutectic Al - Si Alloys |
| Authors |
최수웅(Soo Woong Choi); 김수영(Soo Young Kim); 이상익(Sang Ik Lee) |
| Abstract |
This investigation was carried out to study effects of an amount of sulphur addition, holding time and pouring temperature on refinement of the primary silicon crystals in the hypereutectic Al-Si alloy containing about 21% silicon by the method of metallography. The results obtained are as follows: Addition of 0.4% sulphur to a melt at 750℃ resulted in refinement of primay silicon crystals. The best refining effect was obtained by holding the melt at 850℃ for about 20 minutes after sulphur addition. Refining effect did not improve by holding the melt for more 20 minutes. |