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不同冲蚀角下非均质脆性材料的残余应力和冲蚀机制

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Abstract:

选用典型的非均质脆性材料刚玉质超低水泥耐火材料为靶材,进行常温冲蚀磨损试验,借助有限元动力分析软件ANSYS/LS-DYNA建立单粒子冲蚀模型,参照试验条件模拟半径为0.39mm的碳化硅球形粒子以3.97×10–6(kg·m)/s的动量对靶材的冲蚀过程,计算得到不同冲蚀角下靶材残余应力分布,对冲蚀后的靶材表面进行显微结构分析,研究了不同冲蚀角下靶材的冲蚀机制。结果表明靶材冲蚀磨损率和最大残余应力均随冲蚀角的增加而增大,90°时达到最大值,分别为8.88mm3/g和3.237MPa;30°冲蚀角下冲蚀机制为磨料对靶材表面的微切削,90°冲蚀角下冲蚀机制主要包括基质微切削、粗骨料沿晶断裂和细骨料穿晶断裂。

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