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首页> 外文会议>World foundry congress >INFLUENCE OF THERMO-PHYSICAL PROPERTIES OF MOULDING SANDS ON THE SOLIDIFICATION TIME OF DUCTILE CAST IRON
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INFLUENCE OF THERMO-PHYSICAL PROPERTIES OF MOULDING SANDS ON THE SOLIDIFICATION TIME OF DUCTILE CAST IRON

机译：铸砂热物理性质对球墨铸铁凝固时间的影响

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摘要

For achievement good mechanical properties of ductile cast iron, it is indispensable to obtain the highest quantity of the regular graphite spheroids that should be distributed uniformly in the matrix. The effective wall thickness is also adjusted by the correction coefficient ch expressing the influence of thermo-physical properties of the moulding sand on the solidification time. The graphite takes the shape of nodules due to the solidification conditions produced by the active elements introduced into the melt during metallurgical processing. The basic nodulizing element Mg causes the tendency of cast iron solidity metastably and from this reason, the inoculation has to be done simultaneously or as soon as possible The aim of inoculation is to form the graphite nucleuses of the supercritical size and promote their growth. It is necessary to give increase the regular graphite nodules as much as possible and distribute them uniformly throughout the matrix. This will depend not only on the chemical composition of the melt but also on the cooling gradients given by the casting section thickness and the heat conductivity of the mould. The pouring into the green bentonite sand moulds is the most common method for casting of ductile cast iron. The properties of spheroidal graphite iron (SGI) will depend besides the pouring method also on the casting wall section and the procedure of metallurgical process of the melt.
机译：为了获得球墨铸铁的良好机械性能，必不可少的是要获得最大数量的规则石墨球体，这些球体应均匀地分布在基体中。有效壁厚也通过校正系数ch进行调整，校正系数ch表示型砂的热物理性质对固化时间的影响。由于在冶金过程中引入熔体中的活性元素产生的凝固条件，石墨呈结核状。基本的球化元素Mg会引起铸铁坚固性的趋势，因此，必须同时或尽快进行接种。接种的目的是形成超临界尺寸的石墨核，并促进其生长。有必要尽可能多地增加规则石墨结节，并将它们均匀地分布在整个基体中。这不仅取决于熔体的化学成分，还取决于铸件截面厚度和铸模的热导率所给出的冷却梯度。浇注到生膨润土砂型中是铸造球墨铸铁最常用的方法。球墨铸铁（SGI）的特性除了浇铸方法外，还取决于铸件壁截面和熔体的冶金过程。

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