本研究利用高溫共軛焦雷射掃描顯微鏡(HT-CLSM)進行鎂含量之SS400低碳鋼在高溫釘扎沃斯田鐵晶粒成長和介在物誘導針狀肥粒鐵成長之即時觀測。由即時觀測影像發現介在物能夠在高溫時抑制沃斯田鐵晶界遷移，阻礙沃斯田鐵晶粒成長。13ppm 鎂含量之SS400低碳鋼中MgO-MnS是含鎂介在物最能抑制沃斯田鐵晶粒成長的介在物，其MgO-MnS介在物在沃斯田鐵晶界的佔所有介在物總量之比為43%。鎂含量增加至13 ppm會降低60%的沃斯田鐵晶粒尺寸。接著控制不同製程參數(冷卻速率和沃斯田鐵晶粒尺寸)探討針狀肥粒鐵成核之因素，結果顯示熱應變能和針狀肥粒鐵成核比率成正比關係，冷卻速率10 ℃/s有最佳的針狀肥粒鐵成核比率；適當的沃斯田鐵晶粒能誘導最多的針狀肥粒鐵，沃斯田鐵尺寸152 μm有最佳的針狀肥粒鐵成核比率，此外，還探討了碳擴散最遠距離和沃斯田鐵晶粒尺寸之關係。本研究針對針狀肥粒鐵成核機制進行深入探討，冷卻速率造成介在物周圍產生之熱應變能和肥粒鐵成核之熱應變能相差甚大，故熱應變能並非針狀肥粒鐵成核主因。MgO和MgAl2O4與肥粒鐵具有較低的晶格不匹配度，有助於誘導針狀肥粒鐵成核；而MnS與肥粒鐵具有較高的晶格不匹配度，肥粒鐵不易在其界面成核。複合型介在物(MgO-MnS和MgAl2O4-MnS)會形成錳貧乏區，有助於誘導針狀肥粒鐵成核。

An investigation has been carried out into the effects of the microalloying elements Mg adding into low carbon steel. Controlling process parameter to induce AF nucleation, such as cooling rate and austenite grain size. The probability of AF nucleation at inclusions increased with increasing cooling rate due to the larger thermal strain energy of ferrite formation during the cooling processes. The appropriate austenite grain size exhibits the highest capacity to induce AF formation. Furthermore, the effects of the maximum distance of carbon diffusion and austenite grain size on the microstructure are discussed. Moreover, AF nucleates at the interface of MgO and MgO-Al2O3 because of the low lattice misfit with AF. Complex inclusions, such as MgO-MnS and MgO-Al2O3-MnS, present a better ability of inducing AF formation than that of MnS due to the Mn-depleted zone.

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