高矽鉬球墨鑄鐵的凝固熱分析

Thermal Analysis on Solidification of High Silicon Molybdenum Ductile Irons

蔡智堯(C. Y. Tsai) ； 江芝宇(C. Y. Chiang) ； 張文雄(W. S. Chang) ； 雷添壽(T. S. Lei)

《鑄造工程學刊》 39卷4期 (2013/12) Pp. 1-7

摘要

本篇論文利用水冷激銅模使高矽鉬球墨鑄鐵單向冷激凝固，經單向凝固後鑄件能呈現不同的冷卻速率曲線，藉此觀察凝固過程中不同的冷卻速率對球狀石墨大小、元素偏析生成的合金碳化物及微觀組織與巨觀組織。利用Differential Scanning Calorimetry（DSC）分析鑄件凝固時的熱反應，並與冷卻速率曲線比較探討。使用電解腐蝕技術將肥粒鐵基底溶解掉，使合金碳化物浮出並以SEM觀察形貌探討形成方式。實驗結果顯示：鑄件冷卻時含鉬的共晶碳化物的反應溫度可能是1102˚C，共晶碳化物的立體結構亦清晰可得。

關鍵字

高矽鉬球墨鑄鐵 ； 單向冷激凝固 ； 魚骨狀碳化物

並列摘要

In this paper, using a water-cooled copper mold to achieve unidirectional solidification of high silicon molybdenum ductile iron castings, quality of spheroidal graphite and microstructure of eutectic carbides are presented. Thermal analysis of the casting by using Differential Scanning Calorimetry (DSC) analysis was conducted to calculate value of latent heat of this grade of ductile iron. Electrolytic deep etching technique was used to study the stereo structure of fish-bone M6C structure in the eutectic carbide. The results show that the eutectic temperature of Mo containing carbide during solidification could be around 1102 C and the stereo morphologies of eutectic carbide have been observed.

並列關鍵字

high silicon molybdenum ductile iron ； unidirectionally chilled solidification ； fish bone-like carbide