本文之研究主要是利用霍普金森高速撞擊試驗機，來探討應變速率對316L不銹鋼粉末冶金件撞擊性能的影響。變形實驗條件於常溫25℃下進行，應變速率為2700s-1到7500s-1，變形後之試件利用光學顯微鏡(OM)以及掃描式電子顯微鏡(SEM)進行微觀與破裂分析，再將實驗所得到數據和微觀觀察結果進行分析，以釐清應變速率對動態機械特性及相對微觀組織變化之影響，再引用一合適之材料構成方程式，來描述316L不銹鋼粉末冶金件的高速撞擊之塑變行為，以做為工程模擬與分析之用。
　　由實驗的數據分析之結果，可知應變速率和應變量是影響316L不銹鋼粉末冶金件的機械性質之重要因素。此種材料的塑流應力值、應變速率敏感性係數皆會隨著應變速率之增加而上升，而熱活化體積及加工硬化係數則有相反之趨勢。最後，藉由Khan-Huang-Liang模式之構成方程式，再加入理論溫升量之修正項，可以很準確的用來描述316L不銹鋼粉末冶金件於高速撞擊下之塑變行為。從破壞形貌觀察，可以知道材料若受到高速衝擊時，會有絕熱剪切帶的產生，而且可以發現在剪切帶裡有微空孔，並藉由空孔之聚集連結而造成材料之破壞發生；在破斷面觀察上，可以發現到主要是以韌窩組織的形貌分佈，故屬於延性破壞，而韌窩形貌會隨著應變速率的變化而有不同的改變。

　　A Split-Hopkinson bar is used to investigate the strain rate influence of the impact properties of Type 316L powder compacts. Mechanical testing is performed at room temperature under strain rates ranging from 2700s-1 to 7500s-1. Optical microscopy and scanning electron microscopy techniques are used to analyze the fracture and microstructure characteristics of the deformed specimens to determine the relation between mechanical and microstructural properties. Experimental results indicate that strain and strain rate influence mechanical properties of Type 316L powder compacts. At room temperature, flow stress and strain rate sensitivity increase with increasing strain rate, but activation volume and work hardening coefficient decrease. From fractographic analysis, we find fracture occurs after shear band formation. We also find dimple characteristics on fracture surfaces. The Khan-Huang-Liang constitutive equation with the experimentally determined specific material parameters successfully describes the flow behaviour of Type 316L Powder Compacts for the tested conditions.

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