本研究的目的是研究錳矽鋼的顯微組織與機械性質的關係，主要的方法是利用X光繞射分析、掃描式電子顯微鏡和電子背向散射繞射儀分析不同熱處理條件下錳矽鋼的顯微組織，以及利用拉伸實驗量測其機械性質，以明瞭顯微組織對機械性質的影響。實驗結果顯示，經由適當的熱處理，可以得到3~45 %的沃斯田鐵與肥粒鐵雙相組織，其強度與延伸率均隨沃斯田鐵體積分率增加而上升。在最佳退火條件下，鋼材會有低的降伏比(約70 %)和高的加工硬化率，得以延遲頸縮而得到25 %的延伸率及1.7 GPa抗拉強度。透過其加工硬化曲線可得知，鋼材在應變量約5 %時開始啟動應變誘發相變態，使加工硬化率快速上升，之後加工硬化率隨應變增加緩緩下降直到鋼材斷裂，因此可以得知其加工硬化的機制是來至於應變誘發麻田散鐵相變化。

The current study investigated the mechanical properties and microstructure of two Mn-Si steels. The microstructure of the steels with different heat treatments was investigated by X-ray dirffraction (XRD), scanning Electron Microscope (SEM) and electron backscatter diffraction (EBSD). The mechanical properties were measured by tensile tests. The experimental results showed that 3~40 % austenite can be retained with a ferrite matrix in steels with optimal annealing condition. The steels exhibited a low yield ratio (~70%) and high work-hardening rate. Acoordinary, a total elongation of 25% is yield associated with a ultimate tensile strength as high as 1.7 GPa. The work-hardening rate increases rapidly after 5% strain followed by a slow decrease until necking. The high work-hardening rate is attributed to the strain-induced martensitic transformation.

摘要 I
Abstract ii
總目錄 iii
圖目錄 vi
第一章、前言 1
第二章、文獻回顧 2
第三章、實驗步驟 16
第四章、實驗結果 22
第五章、討論 37
第六章、結論 40
第七章、參考文獻 41

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