本研究對Al-Ti-Mg複合脫氧鋼之介在物特徵進行研究，結合熱力學計算， 建立Al-Ti-Mg複合脫氧鋼介在物預測模型，獲得 1873 K 條件下該鋼種的Mg、Al、Ti、O之間的熱力學平衡關係圖；計算結果顯示，Mg、Al、Ti之脫氧能力依次減弱 ；獲得MgO、MgAl2O4、Al2O3之穩定區域相圖(Phase Stability Diagram)；透過軟體 FactSage 7.1了解降溫過程鋼中介在物演變情形及生成順序，分析不同鎂含量對介在物演變行為之影響， 獲得各相生成比例分析圖(Phase Analysis Diagram)。同時對SS400鋁脫氧鋼添加鈦鎂處理後，經場發射電子顯微鏡觀察介在物特徵，並利用 ASPEX Explorer 分析介在物種類、尺寸及分布密度。
實驗結果顯示在當前鋼液成分下向鋼液中添加微量 Mg 就可以使介在物實現改質，且對於介在物平均粒徑的減小有良好的效果，並得知隨著鎂添加量增加的介在物變性路徑為 Al2O3→ MgAl2O4→ MgO。本研究所得到之結果為：在鋼液成分下添加 5 ppm Mg 時可以達到介在物改質的最佳效果，其介在物之平均粒徑最小、單位面積所含之介在物數量最多且可生成尺寸較小之MgAl2O4。鋼中形成之介在物分別為 TiN, TiC, MnS, MgS, MgO, MgAl2O4, Al2O3。由上述實驗分析結果所示，與熱力學計算後之結果一致。

Due to the increasing demand for high-quality steel, improvements of physical and chemical properties of steels are needed in order to meet the ever-increasing demands on optimized steel properties, particularly in strength, toughness, and weld ability. In order to understand the correlation between amount of additives and inclusions formation, Al-Ti-Mg complex deoxidization thermodynamic calculations and experiment were carried out. The deoxidization equilibria of Al, Ti and Mg are calculated with Mg > Al > Ti. The formation of oxides, such as MgO, MgAl2O4, and Al2O3 are estimated by plotting the phase stability diagram at 1873K steelmaking temperature. Inclusions formation during solidification process have also been identified through FactSage 7.1. Furthermore, the morphological and compositional change of inclusions were also studied.
The experimental results showed that the inclusions modification effect of Mg could be achieved just by the trace addition of Mg (5 ppm of Mg addition has the best modification effect in the present work). Furthermore, the average particle size of the inclusions is also decreased significantly, with average particle size of 1.98 μm. The formation of TiN, TiC, MnS, MgS, MgO, MgAl2O4, Al2O3 are consistent with the calculated results.

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