本論文研究先進高強度中錳鋼，在不同延伸率時肥粒鐵、沃斯田鐵與麻田散鐵各相之應變分配行為。研究應變分配與工程應變及局部應變之關係，並研究肥粒鐵與沃斯田鐵間的相對強度、被他相包圍之晶粒、晶粒大小及Schmid factor與晶粒應變之關係。本研究結果顯示肥粒鐵有高於沃斯田鐵的晶粒應變，而麻田散鐵之應變量最低。當沃斯田鐵較不穩定時，應變量增大，會使肥粒鐵與包含應變誘發麻田散鐵之沃斯田鐵間的應變分配增加，若沃斯田鐵的穩定性夠高，不同應變量下之肥粒鐵與包含應變誘發麻田散鐵之沃斯田鐵間，其應變分配的變化不大。由本研究的結果看不出被他相包圍之晶粒、晶粒大小及Schmid factor與晶粒應變間存在明顯的關係。

In this study, strain partition behavior between ferrite, austenite and martensite grains in an advanced high strength medium-Mn steels has been studied. The relationships between strain partition and engineering strain and local strain have been obtained. The results of this study show that ferrite grains have higher plastic strain than the austenite grains, and martensite grains have the lowest plastic strain. When the austenite grains are less stable, the strain partition between ferrite grains and austenite grains which contained deformation induced martensite increased with increasing specimen elongation. When the austenite grains are stable, the strain partition between ferrite grains and austenite grains which contained deformation induced martensite remained about the same with increasing specimen elongation. In the steel studied, grain size, grain orientation and the phase surrounds the grains have little effect on the grain strain measured.

論文審定書 i
摘要 ii
Abstract iii
目錄 iv
圖目錄 vii
表目錄 xvii
一、前言 1
二、文獻回顧 2
2-1 TRIP鋼 2
2-2 麻田散鐵 2
2-2-1麻田散鐵生成方式 2
2-2-2麻田散鐵誘發形式 2
2-3晶粒尺寸 3
2-3-1晶粒尺寸對強度的影響 4
2-3-2晶粒尺寸受退火的影響 4
2-4 Lüders bands 5
2-4-1晶粒尺寸對Lüders bands的影響 5
2-4-2冷軋對Lüders bands的影響 6
2-5逆變態沃斯田鐵 7
2-6沃斯田鐵的穩定性 7
2-7肥粒鐵與沃斯田鐵受應變之變形行為 8
三、研究目的 15
四、實驗方法 16
4-1 實驗材料 16
4-2 試片製備 16
4-3 實驗流程 16
4-4 拉伸試驗 17
4-5 顯微組織分析 17
4-5-1 SEM試片準備 17
4-5-2 掃描式電子顯微鏡(Scanning Electron Microscopy, SEM) 18
4-5-4背向散射電子繞射(Electron Backscattered Scattered Diffraction, EBSD) 19
4-5-5 Ion Cleaner清除表面汙染物 19
4-6晶粒應變量測 20
4-7局部應變(local strain)量測 20
五、實驗結果 21
5-1第一部分-拉伸試驗 21
5-1-1不同退火溫度 21
5-1-2不同退火時間 21
5-2第二部分-不同應變量下，各相的應變行為 21
5-2-1 700°C退火30分鐘 22
5-2-2 700°C退火8小時 24
5-2-3被他相環繞之晶粒應變的量測 26
5-3第三部分-特定拉伸應變量與EBSD分析 26
5-3-1 SEM拉伸應變與EBSD phase map 26
5-3-2晶粒大小 29
5-3-3 Schmid factor 29
六、討論 31
6-1拉伸試驗 31
6-2晶粒應變量測之誤差 31
6-3肥粒鐵、沃斯田鐵與麻田散鐵之應變分配情形 32
6-3-1應變分配與工程應變及局部應變之關係 32
6-3-2不同應變量下肥粒鐵與沃斯田鐵之應變分配情形 34
6-3-3麻田散鐵對肥粒鐵與沃斯田鐵(不含應變誘發麻田散鐵)間應變分配之影響 35
6-4肥粒鐵與沃斯田鐵的相對強度 35
6-5被他相環繞之晶粒應變 37
6-6晶粒應變量與晶粒大小及Schmid factor的關係 38
七、結論 39
八、參考文獻 40

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