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研究生： 林冠宇
Lin, Kuan-Yu
論文名稱： 熱機處理對純鐵機械性質之影響
Effect of thermomechanical treatment on mechanical properties of pure iron
指導教授： 陳瑾惠
Chern Lin, Jiin-Huey
朱建平
Ju, Chien-Ping
學位類別： 碩士
Master
系所名稱： 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年： 2013
畢業學年度： 101
語文別： 中文
論文頁數： 104
中文關鍵詞： 純鐵 、熱機處理 、機械性質
外文關鍵詞： pure iron, thermomechanical treatment, mechanical property
相關次數： 點閱：58  下載：2 
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    • 本實驗探討不同冷加工程度與熱處理對純鐵所造成的性質影響。主要目的為提升純鐵機械強度並保持一定延性，同時提升腐蝕速率。本實驗分為二部分進行討論，第一部分將純鐵冷滾壓至不同變形量，滾壓形變量分別為A%、B%、C%、D%及E%。第二部分為冷滾壓形變E%後退火處理，選取的退火溫度為T1、T2、T3、T4和T5。
    　　未處理純鐵其降伏強度為169MPa、拉伸強度為257MPa、延性為69%，純鐵強度隨冷滾壓形變量增加而升高，冷滾壓至最終形變量E%降伏強度510MPa、拉伸強度548MPa、延性保有15%；腐蝕速率隨冷滾壓形變量增加而提高，冷滾壓至最終形變量E%有最高腐蝕速率0.1905mm/yr與較高浸蝕降解速率0.1386mm/yr。滾壓形變E%後退火處理T1、1小時有最佳機械性質，降伏強度與拉伸強度分別為506MPa及540MPa，延性回復至21%；而退火處理T5、1小時，產生再結晶現象，降伏強度與拉伸強度分別為180MPa及292MPa，延性為62%。

    In this study, pure iron processed different thermomechanical treatment, expect to reach higher mechanical strength and maintain high ductility as the main purpose. The experiment is divided into two parts: The first part is direct cold roll pure iron into different deformation of A%, B%, C%, D% and E%. The second part is anneal treatment after cold-rolled deformation 80%, and the anneal treatment temperature T1~ T5.
    Pure iron has yield strength 169MPa, tensile strength 257MPa and ductility 69%. The tensile strength is increased with increasing cold roll deformation. Cold-rolled deformation E% has yield strength 510MPa, tensile strength 548MPa, and ductility 15%. The corrosion rate is also increased with increasing cold roll deformation. Cold-rolled deformation E% has the highest corrosion rate 0.2285mm/yr and immersion degradation rate 0.1207mm/yr. Anneal treatment condition T1, 1 hour after cold-rolled deformation E%, which has the best mechanical properties, yield strength 506MPa, tensile strength 540MPa and increased ductility 21%. Recrystallization was observed with anneal treatment condition T5, 1 hour and has yield strength 180MPa, tensile strength 292MPa and increased ductility 62%.

    摘要 I Abstract II 誌謝 III 總目錄 V 表目錄 X 圖目錄 XI 第一章 前言 1 1-1 元素鐵的介紹 1 1-1-1 鐵的起源 1 1-1-2 地球上的鐵礦 2 1-1-3 鐵的物理性質 2 1-1-4 鐵的化學性質 4 1-2 鐵的製備 5 1-2-1 Blast furnace 5 1-2-2 Thermite process 7 第二章 文獻回顧 8 2-1 生醫材料的發展 8 2-1-1 金屬生醫材料 9 2-1-2 陶瓷生醫材料 10 2-1-3 高分子生醫材料 11 2-1-4 複合生醫材料 11 2-2 可降解金屬生醫材料的發展 12 2-2-1鎂及其合金 13 2-2-2 純鐵 15 2-2-3 鐵合金 17 2-3 純鐵、316L不鏽鋼與Ti-6Al-4V ELI性質比較 19 2-4 應力遮蔽效應 20 2-5 研究背景及目的 22 第三章 理論基礎 23 3-1 差排及滑移系統 23 3-2 金屬強化機制 25 3-2-1 晶粒細化強化 25 3-2-2 加工硬化強化 27 3-3 金屬的熱處理 28 3-3-1 退火處理 28 3-4 破斷機制 31 3-4-1 延性破斷(Ductile Fracture) 31 3-4-2 脆性破斷(Brittle Fracture) 32 3-4-3 韌窩(dimple) 33 3-5 腐蝕機制 34 3-5-1 腐蝕傾向 34 3-5-2 極化曲線 36 3-5-3 腐蝕形態 37 3-6 疲勞(Fatigue) 39 3-6-1影響材料疲勞性質之因素 39 第四章 實驗步驟與方法 43 4-1 實驗流程 43 4-2 材料與製備 44 4-3 冷滾壓 44 4-4 試片製作 46 4-5 退火處理 47 4-6 拉伸測試 48 4-7 疲勞測試 49 4-8 硬度測試 50 4-9 動電位極化測試(Poteniodynamic polarization) 51 4-10 浸蝕測試(Immersion test) 54 4-11 Ｘ光繞射(X-ray Diffraction, XRD)相分析 56 4-12 掃描式電子顯微鏡(Scanning Electron Microscope, SEM) 57 4-13 光學顯微鏡(Optical Microscope, OM) 58 第五章 實驗結果與討論 60 5-1 純鐵直接冷滾壓結果與討論 60 5-1-1 純鐵的相組成 60 5-1-2 金相觀察 63 5-1-3 拉伸強度與拉伸彈性模數 70 5-1-4 SEM破斷面觀察 73 5-1-5 硬度測試 77 5-1-6 動態極化曲線 78 5-1-7 浸蝕測試 81 5-2 純鐵冷滾壓再退火處理結果與討論 85 5-2-1 合金的相組成 86 5-2-2 金相觀察 87 5-2-3 拉伸強度與拉伸彈性模數 91 5-2-4 SEM破斷面觀察 93 5-2-5 硬度測試 97 5-5-6 疲勞測試 98 第六章 結論 100 第七章 參考資料 101

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