本研究旨在探討退火升溫速率對非方向性電磁鋼片再結晶集合組織演化的影響，以0.5 ℃/s與15 ℃/s升溫速率分別在590~900 ℃區間進行熱處理。並以再結晶分率與平均晶粒徑為基準，討論升溫速率對再結晶以及晶粒成長階段集合組織的影響。
　　完全再結晶結果顯示，不同升溫速率的平均晶粒徑與再結晶集合組織相似，更近一步發現在兩升溫速率條件之下，再結晶各階段的集合組織演化幾乎相同。推論升溫速率不影響再結晶集合組織的演化，而是由冷軋之微結構所定。利用背向電子繞射(electron backscattered diffraction, EBSD)取向影像顯微術(orientation imaging microscopy, OIM)觀察初期再結晶大多成核於γ-fiber變形晶粒內，且γ-fiber變形晶粒內高角晶界密度相對大於α-fiber，顯示在γ-fiber上的成核影響了後續集合組織的演化。
　　晶粒成長階段的巨觀集合組織顯示，慢速升溫條件的Goss隨著平均晶粒徑增加產生快速下降之現象。然而，從EBSD OIM統計數據仍難以歸納出慢速升溫條件Goss快速下降之原因，值得後續深入探討。

In this study, two heating rates, 0.5 ℃/s and 15 ℃/s, are applied to the annealing process in the production of nonoriented electrical steels (NOES). The effect of heating rate on the texture evolution is analyzed based on the recrystallized fraction in the recrystallization stage and the grain size in the grain growth stage.
At the stage of recrystallization, no significant difference is found on the fully-recrystallized texture and the average grain size obtained by the two heating rates. Moreover, the results of macrotexture analysis reveal that the evolution of recrystallized texture is similar on both of the heating rate conditions. It is proposed that the heating rate, in the range of 0.5 ℃/s to 15 ℃/s, might not affect the evolution of the recrystallized texture, which is mainly determined by the cold-rolled microstructure. The orientation image mapping (OIM) of electron backscattered diffraction (EBSD) indicates that the density of high angle boundary in the deformed γ-fiber grains is more intensive than in the deformed α-fiber grains, and most of the new grains nucleate at the deformed γ-fiber matrixes. Accordingly, it is suggested that the recrystallized nuclei in the deformed γ-fiber grains might be the key to the annealing texture.
At the stage of grain growth, with an increase of average gain size, the Goss component {011}<100> decreases more faster in the condition of 0.5 ℃/s. However, the EBSD data obtained in this study cannot explain this phenomenon. It appears to be worthy of future investigation.

論文審定書 i
致謝 ii
摘要 iii
Abstract iv
目錄 v
表目錄 vi
第一章、前言 1
第二章、文獻回顧 2
2.1 非方性向電磁鋼片 2
2.1.1 電磁鋼片的特性與分類 2
2.1.2 基本磁化原理 [5] 2
2.1.3 電磁鋼片的電磁特性 3
2.2 集合組織 5
2.2.1 極圖(pole figure) 5
2.2.2 Euler space與結晶方位分佈函數 (orientation distribution function, ODF) 5
2.2.3微觀集合組織分析(microtexture) 6
2.2.4 電子背向散射繞射(EBSD)的原理 6
2.2.5 取向影像顯微術(Orientation Imaging Microscopy, OIM) 7
2.3回復 8
2.4再結晶成核機制與模型 9
2.5 鋼鐵材料的集合組織演化 11
2.5.1 低碳鋼常見的軋延與再結晶集合組織 11
2.5.2冷軋延集合組織 11
2.5.3再結晶集合組織的演化理論 11
2.5.4方向性成核理論 12
2.5.5方向性成長理論 13
2.6升溫速率相關文獻 15
第三章、實驗步驟 17
3.1 實驗材料 17
3.2 試片製程 17
3.3 分析方式 17
3.3.1 金相觀察 17
3.3.2 硬度分析 18
3.3.3 XRD極圖量測與集合組織ODF分析 18
3.3.4 EBSD微觀集合組織分析 19
第四章、實驗結果 21
4.1 退火軟化曲線與再結晶分率 21
4.2升溫速率對微結構演變的影響 22
4.2.1 熱軋退火與冷軋試片的微結構 22
4.2.2不同退火升溫速率的微結構變化 22
4.3 巨觀集合組織 23
4.3.1 再結晶各階段集合組織的演變 23
4.3.2 以溫度為基準，比較兩種升溫速率的集合組織 23
4.3.3 以再結晶分率與晶粒徑為基準，比較兩種升溫速率的集合組織 24
4.4 微觀集合組織的觀察 27
4.4.1 再結晶的不均勻性與成核位置 27
4.4.2 晶粒群聚成團現象 27
第五章、討論 28
5.1 升溫速率對再結晶溫度的探討 28
5.2 升溫速率影響平均晶粒徑的探討 29
5.3 升溫速率對再結晶集合組織的探討 30
5.4 升溫速率對晶粒成長階段集合組織的探討 32
5.4.1 晶粒尺寸的分佈 32
5.4.2 結晶方位分佈位置 33
第六章、結論 34
第七章、參考文獻 35

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