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首页> 外文期刊>Journal of Materials Engineering and Performance >Benefits of Residual Aluminum in Ductile Iron
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Benefits of Residual Aluminum in Ductile Iron

机译：球墨铸铁中残留铝的好处

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Two main chemistry systems of micro-inclusions can be identified in ductile iron: Ca-S-X and Mg-Si-O-X with the majority of the inclusions regardless of treatment type and location being of the second type, silicates. Laboratory investigations have shown that simple silicates were present in the matrix, while more complex silicates were present in conjunction with graphite, probably acting as graphite nucleation sites. In these more complex silicates, elevated levels of Al, Ca, Ce and La were typical. Comparing micro-particles embedded in iron matrix and graphite nodules of iron treated with pure Mg-metal and iron treated with MgFeSi alloy showed a higher amount of complex silicates with elevated Al-levels in the iron treated with MgFeSi. Further laboratory investigation was undertaken to explore which source of Al and which range of residual Al would have a favorable impact on the graphite nucleation in ductile iron. The work showed that a residual aluminum of 0.005 to 0.020 wt.% appears to be beneficial for improving ductile iron solidification characteristics without the incidence of pinholes. Greatest benefits were achieved when introducing the Al into the iron via an inoculant late during processing or via a pre-conditioner to the base iron. Al added via the MgFeSi provided less benefit. Some case studies illustrating the effect of Al in ductile iron are also presented, as Al-containing pre-conditioner or/and Al-bearing, FeSi inoculant application.
机译：球墨铸铁中可以发现两种主要的微夹杂物化学体系：Ca-S-X和Mg-Si-O-X，无论处理类型和位置是第二种类型，大部分夹杂物都是硅酸盐。实验室研究表明，基质中存在简单的硅酸盐，而与石墨结合存在更复杂的硅酸盐，这可能是石墨成核的位置。在这些更复杂的硅酸盐中，典型的是Al，Ca，Ce和La含量升高。比较嵌入在纯Mg金属处理过的铁和MgFeSi合金处理过的铁中的铁基体中的微粒和石墨结节中的微粒，发现MgFeSi处理过的铁中具有更高的Al含量的复杂硅酸盐含量更高。进行了进一步的实验室研究，以探索哪种来源的铝和哪种残留铝范围将对球墨铸铁中的石墨成核产生有利影响。该工作表明，0.005至0.020wt。％的残留铝似乎有益于改善球墨铸铁的凝固特性，而不会出现针孔。当在加工后期或通过预调节剂将生铁通过孕育剂引入铁中时，可以获得最大的好处。通过MgFeSi添加的Al提供的益处较少。还提供了一些案例研究，说明了铝在球墨铸铁中的作用，作为含铝的预处理剂或/和含铝的FeSi孕育剂的应用。

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