由於近年綠色產品備受重視，全球鋼鐵產業致力研發無毒害的硫系快削工具。硫系快削鋼內部含有大量的硫化猛，因此具有優異的切削性。然而鋼胚經過熱軋延後，鋼中介在物硫化錳的尺寸、數量和形貌會影響鋼鐵產品的切削性質，所以控制介在物變形行為的研究，變得相當重要。
本研究針對1215MS快削鋼進行Gleeble-3800模擬熱機過程後，藉由觀察硫化錳的形貌及尺寸，探討硫化錳的變形行為。實驗採用影像處理軟體ImageJ分析介在物的形貌及尺寸，並配合EDS進行成分分析及EBSD觀察硫化錳的變形機制，進而了解硫化錳與鐵基相的相對變形行為。
實驗結果顯示，當熱壓量為30%時，硫化錳的平均長寬比會隨著溫度從1050升至1200°C，由1.68先降至1.53再增加至1.76，最後再降至1.61。當熱壓量為50%，隨溫度由1050°C升至1200°C，硫化錳的長寬比由2.33降至2.02。當熱壓量為70%，硫化錳的平均長寬比隨著溫度由1050升至1200°C，會由2.39持續增加至2.66。當熱壓量大於10%，硫化錳的變形量小於鐵基相的變形量。隨著熱壓量由10%增加至50%，硫化錳的真實變形量會由0增加至0.40，但當熱壓量高達70%，硫化錳的真實變形量僅由0.40增加至0.48，表示硫化錳的真實變形量隨著熱壓量增加而趨於平緩。

The effect of manganese sulfide inclusions on the machinability of free-cutting steel is based on their morphology, size and distribution. In this study, the deformation behavior of manganese sulfide was investigated during thermo-mechanical process by gleeble-3800. The microstructure has been characterized by optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), and electron backscattering diffraction (EBSD). In the range of deformation of steel from 10%-70% the deformation of MnS is lower than steel matrix. The deformation degree of MnS is increased as increasing the deformation of steel from 10%-50%, and after 50% deformation it stays constantly. Moreover, deformation of MnS is decreased as increasing temperature at 50%.

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