本實驗研究中錳含量之合金鋼材經軋延程序後，施予不同熱處理的微觀組織變化及其拉伸性質。實驗發現冷軋板材經700oC退火可以得到肥粒鐵、沃斯田鐵與少量的碳化物的組織，此熱處理條件下鋼材具有極佳的機械性質。鋼材經拉伸變形後，於變形的過程中伴隨著沃斯田鐵相變化，形成麻田散鐵造成TRIP效應，因此使材料具有高的加工硬化率，以致拉伸強度及延伸率均極佳。在常溫下進行拉伸試驗，其拉伸強度約為1154 MPa，而工程延伸率可達48%，強塑積為55.4 GPa%，此性質已達到第三代先進高強度鋼板之目標性能。

The microstructures and mechanical properties of a medium manganese steel after rolling and annealing processes have been investigated. It was found that annealed at 700oC after cold rolling, the microstructure of the steel consists of ferrite, austenite, and a small amount of carbides. The best mechanical properties were obtained under this condition. After tensile tests, it was found that the austenite grains gradually transformed into martensite which indicates transformation-induced plasticity occurred during the deformation process. This medium manganese steel was found to have high work hardening rate due to the TRIP effect, so that leads to an excellent combination of ultimate tensile strength and elongation.

一、前言 1
二、文獻回顧 2
2-1 疊差能(stacking fault energy, SFE)對錳鋼變形機制的影響 2
2-2 合金組成對TRIP鋼之性質影響 3
2-3 熱處理對TRIP鋼之微結構影響 6
2-3-1 傳統熱處理 6
2-3-2 ART(austenite-reverted transformation)熱處理 8
2-4 介穩沃斯田鐵系合金中麻田散鐵逆轉變成沃斯田鐵之機制 13
2-5 TRIP鋼之變形行為與機械性質 14
2-6 相組成對低合金TRIP鋼之延展性的影響 20
三、研究目的 23
四、實驗方法 24
4-1 實驗材料 24
4-2 熱處理製程與冷軋 24
4-3 拉伸測試 24
4-4 微觀組織分析 25
4-4-1 掃描式電子顯微鏡 25
4-4-2 背向散射電子繞射 25
4-5 X-ray繞射分析 26
五、實驗結果 27
5-1 微結構觀察 27
5-1-1 熱軋試片 27
5-1-2 冷軋試片 28
5-1-3 冷軋試片經熱處理後的微結構觀察 28
5-2 拉伸變形行為觀察 29
5-3 拉伸後之破斷面與TD面微結構觀察 31
5-4 相組成分析 32
5-4-1 EBSD之結果 32
5-4-2 XRD之結果 34
5-5 化學成份分析 35
六、討論 36
6-1 變形機制 36
6-2 熱處理對沃斯田鐵相分率的影響 37
6-3 熱處理對微觀組織與機械性質的影響 37
七、結論 41
八、參考文獻 42

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