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研究生： 胡廷菁
Ting-Jing Hu
論文名稱： 錳鋁鋼的層狀反應相變化研究
The study of lamellar structures from the cellular reaction in an Fe-C-Mn-Al alloy
指導教授： 鄭偉鈞
Wei-chun Cheng
口試委員: 顏怡文
Yee-wen Yen
雷添壽
Tien-Shou Lei
學位類別： 碩士
Master
系所名稱： 工程學院 - 機械工程系
Department of Mechanical Engineering
論文出版年： 2012
畢業學年度： 100
語文別： 中文
論文頁數： 157
中文關鍵詞： 鐵錳鋁 、層狀反應 、相變化 、k-碳化物 、M23C6碳化物
外文關鍵詞： Fe-C-Mn-Al, cellular reaction, k-carbide, phase transformations, M23C6 carbide
相關次數： 點閱：293  下載：7 
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    • 本論文研究四元的鐵-17.9錳-8.38鋁-0.85碳合金鋼的低溫相變化。經高溫熱處理後以淬水的固溶處理及空冷方式冷卻至室溫，以及將固溶處理後之合金作低溫的恆溫熱處理後，合金鋼內產生至少三種型式的相變化。首先為g’相的析出反應：當合金鋼於高溫經空冷方式冷卻後，非常細小的g’晶粒會均勻的分佈於沃斯田體基地內；這是於冷卻過程中，高溫過飽和的沃斯田體(go)會經由析出反應方式，分解為g’相與另一沃斯田體相g”)，其反應式為：go->g'+g”。第二類的相變化形式為初析反應，其為於低溫時發生的共析反應的前反應，其反應如下：合金於875℃以下溫度熱處理後，過飽和沃斯田體會經由初析反應，藉由肥粒體(a)或是k-碳化物的析出，而成為低溫較穩定的沃斯田體(g)，其反應式為：go->a+k+g；晶界k-碳化物、晶界肥粒體、(g+k)層狀組織、(a+k+g)層狀組織、與(a+k)波來體，皆為此初析反應的產物。第三類的相變化則為共析反應：合金於600℃的恆溫處理後，過飽和沃斯田體會經由初析反應而先析出低溫穩定的k-碳化物與肥粒體，以降低沃斯田體基地(g)的鋁含量；此二種低溫相會形成波來體層狀組織；而後發展的層狀波來體內會有M23C6碳化物出現，此種相變化是為共析反應，其反應式為：g->a+k+M23C6。

    Three kinds of phase transformations of an Fe-17.9 Mn-8.38 Al-0.85 C (wt%) alloy at low temperatures have been studied. The steel underwent solution heat treatment at 1100℃ and isothermal holding at low temperatures. Decomposition of austenite took place after the steel was heat treated at 1100℃ and followed by air-cooling. Coherent ultra-fine particles of g’ phase precipitated homogeneously in the austenite matrix during cooling. These ultra-fine particles could only be detected in TEM dark-field images. The supersaturated austenite (go) decomposed into g’ phase and another austenite (g”) through precipitation transformation. The overall transformation is as follows:go->g'+g”. A pro-eutectoid reaction happened after isothermal holding of the alloy at temperatures below 875℃-carbide precipitate in the austenite matrix (g) to reduce the solute content of the supersaturated austenitek-carbide (k) and ferrite (a) appear as grain boundary precipitates and cellular precipitates. The cellular precipitates are composed of lamellae of either (g+k),(a+k+g) or (a+k).Various lamellae may co-exist in the austenite. The proeutectoid transformation is go->a+k+g. The third form of phase transformation is the eutectoid reaction for the decomposition of retained supersaturated austenite into ferrite,k-carbide and M23C6 carbide after the precipitation of the proeutectoid k-carbide and ferrite. However, this reaction could only be observed in the steel at 600℃. The eutectoid reaction is in the form ofg->a+k+M23C6。

    第一章 前 言 第二章 文獻回顧 2.1 擴散型相變化 ............................................................................... 4 2.2 層狀反應 ....................................................................................... 5 2.3 合金鋼中的碳化物........................................................................ 6 2.4 鐵碳系統的共析反應 .................................................................. 10 第三章 實驗方法 3.1 合金冶煉 ..................................................................................... 22 3.2 鑄錠加工 ..................................................................................... 23 3.3 熱處理 ......................................................................................... 23 3.4 試片製作 ..................................................................................... 25 3.5 分析儀器 ..................................................................................... 29 第四章 結果與討論 4.1 低溫恆溫處理 ............................................................................. 39 4.2 ’相的析出 ................................................................................... 49 4.3層狀反應g1→g2+k................................................................. 54 4.4 初析產物：肥粒體與k-碳化物 ................................................... 56 4.5 共析反應g→a+k+M23C6 .................................................... 60 第五章結論 參考文獻

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