本研究主要是探討流路系統的設計及不同球化劑種類及其形狀和投入量的改變對於縮墨鑄鐵金相組織的影響，實驗結果顯示：
1.採用混合型反應室的流路系統，可得較佳之縮墨率，其中以M-C(如圖3-11)及M-H(如圖3-16)等兩種流路系統效果最好。
2.過濾片不宜水平置於反應室出口的上方，否則會產生阻塞現象，鐵水不宜自反應室的底部進入，否則球化劑會浮於鐵水表面而不易熔解。
3.比熔解表面積值宜大於50及採用錐管狀球化劑，可得最高之縮墨率。
4.粒狀球化劑直徑在5mm以下時，因顆粒間的間隙太小，鐵水不易流進顆粒間混合，故適用於一般型反應室。5mm以上則適用於混合型反應室。
5.球化劑採用KC-5及投入量為0.8%，可得最高之縮墨率。

This study mainly focuses on the effect on the microstructure of the compacted graphite iron according to designs of the runner systems, and the different kinds, shapes and quantities of the treatment alloy. The results of the research is below:
1.We can get better rates of the compacted graphite by using the runner systems of the mixed reaction chamber, especially in M-C(fig.3-11) and M-H(fig.3-16).
2.It is not good to put the filter upon the outlet horizontally; otherwise it would be obstructed. It is not good to deal with the molten iron directly from the bottom of the reaction chamber; otherwise the treatment alloy would float on the surface of the molten iron and not be dissolved easily.
3.To adopt the treatment alloy with taper-pipe shape and the SSA is bigger than 50, the rate of the compacted graphite is the highest.
4.When the diameter of a grain of treatment alloy is less than 5mm, it is suitable for the common reaction chamber. Because the gaps between grains are too small, the molten iron can’t flow easily and mix with them. Besides, the diameter, which is more than 5mm, is suitable for the mixed reaction chamber.
5.When choosing the KC-5 treatment alloy and the quantity is 0.8%, we can get the highest rate of the compacted graphite.

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