本實驗研究不同拉伸溫度對中錳鋼拉伸性質與顯微組織的影響，實驗發現在拉伸溫度為75℃時有最大的伸長量為85%，其抗拉強度略低於室溫，因此，會有最佳的強延積，且從顯微組織的觀察亦能發現大量的應變誘發麻田散鐵的生成。拉伸溫度為100℃時鋼材的伸長量下降至最低值，此溫度接近鋼材的Md溫度，在100℃時應變誘發麻田散鐵的相變化會減緩，取而代之的是應變誘發變韌鐵的相變化，但其量很少且組織極為細小。拉伸溫度高於150℃以後，鋼材強度持續下降，鋼材的伸長量開始上升，此時應變誘發麻田散鐵不再形成，而應變誘發變韌鐵的量持續上升且組織逐漸粗大。當拉伸溫度達300℃時，應變誘發變韌鐵幾乎不再生成，此時鋼材的伸長量再度下降。

The purpose of the study is to know the effect of test temperature on the tensile properties and microstructures of a medium manganese steel. The range of the test temperature is from room temperature to 300℃. The results showed that when tested at 75℃, highest elongation of 85% together with a large amount of deformation-induced martensites were obtained. At 100℃, the amount of deformation-induced martensite was reduced, and replaced by a small amount of deformation-induced bainite, so that caused a significant drop of elongation. When the test temperatures were higher than 150℃, the strength of the steel was reduced, and the elongation of the steel started to rise. When the test temperature was increased to 300℃, no deformation-induced transformation was found and both the tensile strength and elongation of the steel were reduced.

目錄
論文審定書 i
中文摘要 ii
Abstract iii
目錄 iv
圖目錄 vii
表目錄 xix
一、前言 1
二、文獻回顧 2
2-1麻田散鐵 2
2-1-1麻田散鐵不同相變化溫度之定義 3
2-1-2板狀麻田散鐵(Lath martensite) 4
2-1-3盤狀麻田散鐵(Plate martensite) 4
2-1-4透鏡狀麻田散鐵(Lenticular martensite) 5
2-2TRIP鋼 5
2-2-1 TRIP效應 6
2-2-2 TRIP效應與殘留沃斯田鐵體積分率的關係 6
2-2-3 TRIP鋼相變化過程中的化學及機械驅動能 7
2-2-4 沃斯田鐵預先變形(priordeformation)的TRIP效應 7
2-2-5透過ausforming和其他方法強化試片 8
2-3應力誘發與應變誘發麻田散鐵 8
2-4麻田散鐵的成核機制 9
2-5溫度對TRIP效應的影響 10
2-5-1溫度對TRIP鋼顯微結構變形機構的影響 10
2-5-2溫度對TRIP鋼成核速率的影響 12
2-5-3溫度對TRIP鋼機械性質的影響 14
2-5-4 M_s^σ溫度與TRIP鋼相轉變行為之間的關係 17
2-5-5溫度對疊差能的影響 18
2-5-6合金成份對TRIP鋼相轉變溫度的影響 18
2-5-6溫度與麻田散鐵體積分率的關係 19
2-6拉伸溫度對應變誘發麻散鐵和應變誘發變韌鐵相變化的影響 20
三、研究目的 22
四、實驗方法 23
4-1實驗材料 23
4-2實驗步驟 23
4-3拉伸試驗 23
4-4顯微組織分析 24
4-4-1 掃描式電子顯微鏡(Scanning Electron Microscopy, SEM) 24
4-4-2背向散射電子繞射(Electron Backscattered Scattered Diffraction, EBSD) 24
4-4-3 X光能量散佈光譜儀(Energy dispersive spectrometers,EDS) 25
4-4-4 X-ray繞射分析(X-ray diffraction, XRD)進行試片相分率的分析。 25
五、實驗結果 26
5-1不同拉伸溫度之機械性質 26
5-2拉伸前顯微組織 27
5-3不同拉伸溫度之拉伸後顯微組織 28
5-3-1室溫下拉伸後顯微組織 28
5-3-2 50℃拉伸後顯微組織 28
5-3-3 75℃拉伸後顯微組織 29
5-3-4 100℃拉伸後顯微組織 29
5-3-5 125℃拉伸後顯微組織 30
5-3-6 150℃拉伸後顯微組織 30
5-3-7 175℃拉伸後顯微組織 30
5-3-8 255℃拉伸後顯微組織 31
5-3-9 300℃拉伸後顯微組織 31
5-4相分率分析 32
5-5晶粒尺寸 33
5-6 EDS成份分析 34
六、討論 35
6-1不同拉伸溫度下拉伸後EBSD部份區域未解出之可能原因 35
6-2各拉伸溫度下之變形組織 38
6-3各溫度拉伸性質與顯微組織之間的關係 40
七、 結論 42
八、參考文獻 43

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