Wear resistance and damping capacity of semisolid processed hypoeutectic grey cast iron
Wear resistance and damping capacity of semisolid processed hypoeutectic grey cast iron
复制标题
半固态加工亚共晶灰铸铁的耐磨性和阻尼能力
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
M. Takita
中科院分区：
文献类型：
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作者：
M. Ramadan;H. Nomura;M. Takita
研究了亚共晶灰铸铁（碳当量= 3.59%）的耐磨性和阻尼性能与初生固相相对含量的关系。在本研究中，作者使用了一个冷却板，以产生半固态铁浆。在本研究中使用的砂型铸件与14毫米带厚度。为了比较，还对由15 mm厚的Y形块制成的普通球墨铸铁试样进行了阻尼性能试验。采用半固态加工工艺提高了灰铸铁的耐磨性。灰口铸铁的磨损率随固相分数的增加而减小，直至0·12。固体分数的进一步增加由于形成互连的D型细石墨而增加磨损率。石墨析出物的形状、大小和排列方式对铸铁件的摩擦磨损机制有很大影响。对于高载荷下的半固态铸造，增加滑动速度会增加氧化速率，从而改变磨损机制。半固态灰铸铁的阻尼性能在所有应变幅范围内均低于普通灰铸铁，但高于球墨铸铁。普通灰铸铁和半固态灰铸铁的阻尼性能均随应变幅的增大而增大。
The wear resistance and damping capacity of hypoeutectic grey cast iron (carbon equivalent =3·59%) were investigated as a function of the relative amount of primary fraction of solid. In the present study the authors have used a cooling plate to produce semisolid iron slurry. Sand mould castings with 14 mm strip thickness were used in the present study. For comparison, damping capacity was also carried out on ordinary ductile iron specimen made from Y block with 15 mm thickness. The wear resistance of grey cast iron was improved using the semisolid processing. The wear rate of grey iron decreases as the fraction of solid increases until 0·12. Further increase of fraction of solid increases the wear rate due to formation of interconnected fine graphite type D. Frictional wear mechanism of iron casting is strongly affected by shape, size and arrangement of graphite precipitates. For semisolid casting at high loading, increasing the sliding speed increases the rate of oxidation and consequently changes the wear mechanism. The damping capacity of semisolid grey cast iron is lower than ordinary grey iron but higher than ductile iron for all strain amplitude ranges. The damping capacity of both ordinary and semisolid grey cast iron increases with strain amplitude.