在零件开始凝固其内部形成固态金属的小型树枝状结晶期间金属性能被确定，同时也产生了内应力。
Once the part starts to solidify small dendrites of solid material form in the part. During this time metal properties are being determined, and internal stresses are being generated.
随着熔体过热温度的升高， 凝固组织中初生硅形状由多边形向星形及树枝状转变。
At higher overheating temperature, the shape of primary silicon becomes the star-shape and tree-shape.
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