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題 名 | 合金元素對鐵錳鋁碳合金鑄件顯微結構的影響=Effects of Alloy Additions on the Microstructures of Fe-Mn-Al-C Alloy Castings |
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作 者 | 吳忠春; 趙志燁; 黃志能; 劉增豐; | 書刊名 | 鑄工 |
卷 期 | 23:1=92 1997.03[民86.03] |
頁 次 | 頁21-30 |
分類號 | 472.2 |
關鍵詞 | 電子顯微鏡分析; 鐵錳鋁碳合金鑄件; 析出強化; (Fe,Mn,M)[feb0]AlCx碳化物; 均勻整合析出; TEM analyses; Fe-Mn-Al-C alloy casting; Precipitation strengthening; (Fe,Mn,M)[feb0]AlCx carbides; Homogeneously coherent precipitation; |
語 文 | 中文(Chinese) |
中文摘要 | 本論文之主要目的係利用電子顯微鏡針對各種合金添加元素對鐵錳鋁碳合金鑄件 顯微結構的影響作一探討。結果發現,傳統成份的鐵錳鋁碳合金鑄件在未添加其他合金元素 時, 其抗拉強度無法獲得突破, 因為鐵錳鋁碳合金最主要的強化機構是藉著 (Fe,Mn) �� AlCx 碳化物的析出而產生強化效果, 而由電子顯微鏡觀察中發現此時的鐵錳鋁碳合金鑄件 中,並未有明顯 (Fe,Mn) �� AlCx 碳化物的形成。 當我們在鐵錳鋁碳合金中添加少量的鈦 、 鈮或釩等元素時, 在鑄造凝固後約 950-1150 ℃的溫度範圍, 將會促使非常細微的 (M) �� AlCx 碳化物在此高溫狀態下即在沃斯田鐵相基地內均勻整合析出(其中 M 代表鈦 、鈮或釩等元素)。在鑄件空冷至室溫的過程中,析出物會以這些既存的微細 (M) �� AlCx 碳化物為核而成長, 進而在沃斯田鐵相基地內產生大量且細小的 (Fe,Mn,M) �� AlCx 碳化 物。由於這些在鑄造過程析出的碳化物所產生的強化效果,使得鐵錳鋁碳合金鑄件的機械強 度獲致大大的提昇,而延伸率及韌性無明顯的降低。這個發現在鐵錳鋁碳合金鑄件研究中尚 未被發現。 |
英文摘要 | Effects of various alloying additions on the microstructures of Fe-Mn-Al-C alloy castings have been investigated by means of transmission electron microscopy. It is well -known that the precipitation of (Fe, Mn) AlCx carbides within the austenite matrix is the main strengthening mechanism in the Fe-Mn-Al-C alloy system. In the present research, it is found that Fe-Mn-Al-C alloy castings without alloy additions can't achieve excellent mechanical properties because that no obvious (Fe, Mn) �� AlCx carbides can be found within the austenite matrix in the as-cast condition. However, when alloying element M is added to Fe-Mn-Al-C alloy castings, extremely fine (M) �� AlCx carbides precipitated coherently within the austenite matrix at temperatures ranging from 950 to 1150 ℃ (M is defined as Ti,Nb or V). During the subsequent cooling process, precipitates grow rapidly on extremely fine as-existing (M) �� AlCx nuclei. Finally, a large amount of (Fe, Mn, M) �� AlCx carbides are precipitated within the austenite matrix. Therefore, Fe-Mn-Al-C alloy castings can possess a remarkable combination of strength and ductility, which are attributed to the strengthening effects of formation of fine (Fe, Mn, M) �� AlCx carbides during the casting process. This observation has never been reported by other researchers in the Fe-Mn-Al-C alloy system before. |
本系統中英文摘要資訊取自各篇刊載內容。