- 期刊
稀土元素（鈰）對薄壁球墨鑄鐵球化率衰退之影響
Effect of Rare Earth Element (Ce) on Vodularity Decay in Thin Walled Ductile Cast Iron
摘要
本研究之主要目的，在於研究稀土元素（鈰）對薄壁球墨鑄鐵球化率的影響。實驗中所研討的變數，球化劑部分包括稀釷元素的添加量、尺寸、球化反應時間及球化方式；接種劑部分包括接種劑量及接種方式。以純度99%以上的稀土元素（鈰）作球化劑，加入於鐵回收料FCD-450中球化反應，並施以Fe-Si作接種處理，各爐次試驗溫度範圍在1400~1500℃之間，並做不同時間出湯之試驗，採用工廠常用於白口試驗的砂心盒作為薄壁鑄鐵的模具，以求得知以鈰作球化劑於薄壁球墨鑄鐵中的衰退週期及對球化率的影響。 結果顯示，以鈰完全取代鎂做球化劑，施以3%的球化劑添加量及1.5%添加量的Fe-Si作接種處理，球化反應開始後的第10分鐘，可得到球化率90%的薄壁球墨鑄鐵，但隨著球化反應時間的拉長，球化率因球化劑的衰退而愈趨降低，當球化反應30分鐘左右，球化率已降低至60%，為不規則球墨，40分鐘後僅剩下縮墨及細小的片墨。 此外，本文亦針對以鈰做球化劑來製作薄壁球墨鑄鐵之製程條件進行探討。
並列摘要
The main purpose of this paper is to investigate the influence of metallographic on cast iron which have trace element. The variable in the experiment include trace element type, quantity, reaction time and spheroidizing methods. And quantity of inoculation, size of inoculation and inoculate methods. In the experiment to make Nodular Cast Iron is use rare earth element (Ce) which pure rate above 99% to be nodularizer add into molten iron (FCD-450). Then inoculate with FeSi. Experiment temperature are within 1400 to 1500℃ in every furnace lot, and test pour out at different time. We useed sand box to be cast mold which thin wall type in every factory, in order to know Thin Wall Nodular Cast Iron spheroidizing rate influence by nodularizer decay. Experiment result shows that use cerium 3% to replace magnesium to be nodularizer, and add inoculate FeSi 1.5%. When spheroidizing ten minute, we can obtain Thin Casting Nodular Cast Iron nodularity 90%. when spheroidizing at a long time later, nodularity below 50%, to replace vermicular and flat piece graphite. In addition, this article is directed to manufacturing process about use cerium to replace magnesium to manufacture Thin Casting Nodular Cast Iron.