The dimension stability of hyper eutectic Al Si alloy piston is higher than that of eutectic Al Si alloy piston.
过共晶铝合金活塞的尺寸稳定性高于共晶铝合金活塞；
Five series ductile iron elements of hyper eutectic, hypo eutectic, eutectic have been tested using color metallograph method.
利用彩色金相对过共晶和亚共晶球铁磨球五组试样进行了试验对比。
The crown diameter of eutectic al Si alloy piston has increased suddenly in twice, but the hyper eutectic al Si alloy piston only once.
共晶铝硅合金活塞顶部直径有两次突然长大，而过共晶铝合金活塞仅有一次。
In order to improve the micro-structure and the properties, the components of the nodular cast iron ball should be controlled in the point of eutectic or hyper-eutectic near the point of eutectic.
为改善球铁磨球的显微组织及性能，球铁成分应控制在共晶或稍过共晶处。
In order to improve the micro-structure and the properties, the components of the nodular cast iron ball should be controlled in the point of eutectic or hyper-eutectic near the point of eutectic.
为改善球铁磨球的显微组织及性能，球铁成分应控制在共晶或稍过共晶处。
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