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介绍了热扩散率α、比热容Ｃ、热导率Ｋ等热物性参数（热三数）在金属中（纯金属与加入其他材料的合金）、球铁、蠕铁和灰铁等三种不同石墨形状影响下的变化。结果表明，纯金属（铜）的α值比掺入Ａｌ合金及加碳纤维的铜合金大。而比热容Ｃ则与α相反，纯铜最小，加入Ａｌ的合金次之，加碳纤维的最大。而Ｋ值则与α值成正比，纯铜的Ｋ值远大于另两种合金的Ｋ值。铸件中球状石墨的α数值远远小于片状石墨的α值。蠕虫状石墨介于二者之间。片状石墨的Ｋ值大于球状石墨的Ｋ值（差值大于２倍），Ｃ值差异不明显。片状石墨的α曲线随温度上升呈下降趋势。材料（３Ｃｒ１３）密度大则α和Ｋ值均较密度小的大。一般情况下，造型材料的Ｋ值都随温度的提高而增大。
The thermal properties such as thermal diffusivity α, specific heat capacity C, thermal conductivity K and other thermal properties (thermal number three) are introduced into the metal (pure metal and alloy with other materials), ductile iron, vermicular graphite and gray iron Changes under the influence of shape. The results show that the α value of pure metal (copper) is larger than that of copper alloy doped with Al alloy and carbon fiber. The specific heat capacity C and α opposite, the smallest copper, adding Al alloy followed by the largest plus carbon fiber. While the K value is proportional to the value of α, pure copper K value is much larger than the other two K values. The α value of the spheroidal graphite in the casting is far less than the α value of the flake graphite. Worm-like graphite is in between. Flake graphite K value is greater than the spherical graphite K value (difference greater than 2 times), C value difference is not obvious. The α curve of flake graphite shows a decreasing trend with the temperature rising. Material (3Cr13) density and then α and K values are less than the density of large. Under normal circumstances, modeling materials K value increases with increasing temperature.