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本文研究了含2,9,15,20和27％Cr白口铸铁的磨料磨损耐磨性和断裂韧性。这五种铸铁的共晶碳化物分数保持不变,在20—25％范围内。用热处理得到马氏体和奥氏体两种基体。结果表明,Cr/C增加时,碳化物从M_3C转变为M_7C_3,M_7C_3本身的硬度也随Cr/C而提高,碳化物的形貌由连续网状转变为杆状或板状。这些特征均对耐磨性和韧性有利。销-盘磨损试验和湿式橡胶轮试验结果指出,只有当碳化物能保护基体,上述这些有利的特征才能表现出来,Cr/C的提高能有效地提高耐磨性。
In this paper, abrasive wear resistance and fracture toughness of 2,9,15,20 and 27% Cr white cast iron were studied. The eutectic carbide fractions of these five cast irons remain unchanged at 20-25%. Heat treatment to get martensite and austenite two kinds of matrix. The results show that when Cr / C increases, the carbide changes from M_3C to M_7C_3, and the hardness of M_7C_3 itself also increases with the increase of Cr / C. The carbide morphology changes from continuous network to rod or plate. These features are both good for abrasion and toughness. Pin-disc wear test and wet rubber wheel test results show that only when the carbide can protect the matrix, these favorable characteristics can be demonstrated, the improvement of Cr / C can effectively improve the wear resistance.