研究生: |
吳旻紘 Min-Hung WU |
---|---|
論文名稱: |
鐵-31錳-1.5鋁-0.6碳合金鋼之時效相變化研究 Phase transformations during aging processes in an Fe-31Mn-1.5Al-0.6C alloy |
指導教授: |
鄭偉鈞
Wei-Chun Cheng |
口試委員: |
王朝正
Chaur-Jeng Wang 李志偉 Jyh-Wei Lee |
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: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 81 |
中文關鍵詞: | 碳化物 、M23C6 、鐵錳鋁合金 |
外文關鍵詞: | carbid |
相關次數: | 點閱:604 下載:2 |
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本論文的合金成份為鐵-30.8錳-1.53鋁-0.6碳(wt.%)。合金於1100℃的溫度下為單一的沃斯田體相。於700℃以上處理之合金的組成相與固溶處理後的狀態相似。
當合金經溫度為650℃以下的時效處理後,於沃斯田體晶粒間有M23C6碳化物的成核成長,此 M23C6碳化物之晶格常數a約為1.040 nm,而沃斯田體之晶格常數a約為0.362 nm。當此M23C6碳化物是沿著沃斯田體晶界處成核成長,其析出的數量會隨著時效時間的增長而變多。而在時效溫度為550℃時,M23C6碳化物之析出量是為最多,故推斷550℃為本合金之M23C6碳化物析出之鼻部溫度。
由於本合金經固溶處理後為單一的沃斯田體相,而合金經時效處理後,於晶界處有析出的M23C6碳化物與鄰近之一的沃斯田體基材保持有立方晶對立方晶的方位關係。本論文發現此種立方晶對立方晶的方位關係至少存在有二種型式;其最常被觀察到者為[001]C//[001]γ及(200)C//(200)γ。另一為[001]C//[001]γ及(220)C //(200)γ,其中下標C表示M23C6碳化物,下標γ表示沃斯田體。此新方位關係為M23C6碳化物之晶帶軸Z = 001與沃斯田體之晶帶軸Z = 001分別相對旋轉了約45°之新方位關係,其為這是本論文首次發現之M23C6碳化物與沃斯田體相的新方向關係。故M23C6碳化物於沃斯田體晶粒間的析出成長,可以至少以二種不同之變異體成核成長。
In this study, our purpose was to study the structure changes of Fe- 30.8Mn-1.53Al-0.6C (wt. %) alloy. At temperature of 1100 ℃, the alloy is a single phase of austenite. After 100-hr aging at 900, 800 or 700 ℃, the alloy showed no change, but remained mostly austenite.
After 100-hr aging at 650, 600, 550 and 500 ℃, M23C6 carbides nucleated and grew on the austenitic grain boundaries. The lattice parameter of M23C6 carbide is about 1.040 nm, and the austenite is about 0.362 nm. At 550 ℃ the mount of M23C6 carbide was the most, making 550 ℃ the nose temperature for the precipitation of M23C6 carbides in this alloy.
There are two different cube-cube orientation relationships between M23C6 carbide and austenite grains. The most common one is [001]C//[001]γ and (200)C//(200)γ. The other is [001]C//[001]γ and (220)C //(200)γ, where the subscript C represents M23C6 carbide and γ represents austenite. The difference between these two orientation relationships is that the [001]C//[001]γ and (220)C //(200)γ orientation relationship rotated along the [001] axis about 45 degrees from the M23C6 carbide-austenite zone axis, resulted in the [001]C//[001]γ and (200)C//(200)γ relationship. This is a new M23C6 carbide-austenite orientation relationship, seen for the first time in this study. It is concluded there are, at least two variants of M23C6 carbide nucleated and grew at austenite boundaries.
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