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題 名 | 球墨鑄鐵廠產製縮墨鑄鐵之可行性研究=Feasibility Study of Producing Compacted Graphite Iron in a Ductile Iron Foundry |
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作 者 | 許正勳; 李深智; 游元信; | 書刊名 | 大同學報 |
卷 期 | 26 1996.11[民85.11] |
頁 次 | 頁327-336+425 |
分類號 | 440.363 |
關鍵詞 | 球墨鑄鐵廠; 縮墨鑄鐵; |
語 文 | 中文(Chinese) |
中文摘要 | 縮墨鑄鐵是近年來新興起之鑄鐵材料,由於具有優良特性之組合,在工業材料應用上已漸受到國外市場重視,有取代其化鑄鐵材料之趨勢。研製縮墨鑄鐵已有多種方法被提出,然而方法不同縮墨效果亦不相同,而且成本效益也是重要的考量因素。本研究乃採用較經濟又便利之不足量球化處理法,利用球化劑添加量的控制來處理延性鑄鐵鐵水,探討鑄件截面大小及添加銅元素對縮墨鑄鐵之金相組織與機械性質的影響,以評估球墨鑄鐵廠產製縮墨鑄鐵之可行性。實驗結果顯示:不管銅的添加與否,當球化劑添加量為0.9wt%時,在鑄件截面厚度5∼30mm範圍內皆可獲得良好之縮墨鑄鐵(縮墨率80%以上),其機械性質符合ASTM規範Grade300以上。縮墨率會隨著鑄件厚度增加而增加,因此機械性質則隨之而降低;當球化劑添加量0.6wt% 以下且添加銅時,石墨形狀皆為片狀,而且銅元素有細化石墨、促進波來鐵生成和抑制石墨球化之效用。另不添加銅者,當球化劑添加量0.6wt%時,石墨形狀為球墨、縮墨和片墨之混合,無法獲得穩定之縮墨鑄鐵,而且隨著厚度增加片狀石墨生成越多,因此機械性質亦明顯地降低。 |
英文摘要 | This research studied the effects of section size and copper alloy addition to the production of compacted graphite (CG) cast iron. The CG iron was produced by the method of controlling spheroidizer addition in the processing of ductile iron. The results showed that when spheroidizer applied to molten iron in the amount of 0.9wt%, and within the casting thickness of 5∼30 mm in this experiment, CG iron of over 80% vermicularity (balance nodular graphite) was produced with or without copper alloying. The mechanical properties of the CG iron thus obtained conformed to ASTM Grade 300 standard. Also, it was found that the vermiculatiry increased (i.e. the percentage of nodular graphite decreased) when the section size of the casting increased. This has an effect of lowering mechanical properties of the CG iron. Copper alloying seemed to refine graphite morphology, promote the formation of pearlite, and restrain the percentage of nodularity. However, when the addition of spheroidizer was less than 0.6wt%, the iron treated with copper turned out to be flake graphite gray iron while the iron without such treatment resulted in a microstructure mixed with nodular, flake, and compacted graphites which can not be classified as CG iron. |
本系統中英文摘要資訊取自各篇刊載內容。