
[冶] 凝固收缩
The solidification shrinkage mechanism of unsaturated polyester resin is analysized by using free Volume theory in this paper.
本文用自由体积理论分析了不饱和聚酯树脂的固化收缩机理。
The effects of casting modulus, pouring temperature. carbon equivalent and mould toughness on the solidification shrinkage of ductile cast iron was investigated experimentally.
实验测定了化学成分、浇注温度、铸件模数和铸型刚度对球墨铸铁收缩特性的影响。
Is mainly the size effect and solidification, shrinkage, stress and other issues clearly, to avoid or reduce the segregation, iron manhole cover deformation and crack defects.
主要是明显的尺寸效应和凝固、收缩、应力等问题,避免或减少铸铁井盖的成分偏析、变形、开裂等缺陷的产生。
The results are very important to understand the solidification characters of steel castings with T conjunction and to estimate the position of the hot-spot in the castings to avoid shrinkage defects.
得到有益于认识铸件中此类接头凝固特性和热节位置的变化规律,对工艺设计者认识和防止成型过程中产生凝固收缩缺陷是很必要的。
They also undergo a high shrinkage or reduction in volume during solidification.
它们在固化过程中收缩较大或体积减少较多。
|contraction of solidification;[冶]凝固收缩
solidification shrinkage(凝固收缩) 是材料科学和铸造工艺中的核心概念,指液态金属或合金在冷却凝固过程中因相变(液态→固态)导致的体积缩小现象。这种收缩源于原子排列方式的根本变化:液态时原子无序排列、间距较大,而固态晶体结构中原子排列紧密有序,密度显著增加。
物理本质
凝固时原子从液态的短程有序转变为固态的长程有序晶格,原子间距减小,宏观表现为体积收缩。收缩量取决于材料类型(如铸铁收缩率约1.8%,铸铝约6%)和冷却条件。
工业影响
若收缩得不到有效补偿,会在铸件内部形成缩孔(shrinkage cavity)或缩松(porosity),显著降低力学性能和密封性。例如,发动机缸体铸造中,凝固收缩缺陷可能导致冷却液渗漏。
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solidification shrinkage 是材料科学和工程领域的术语,指物质在凝固(从液态转变为固态)过程中因相变或结构变化导致的体积收缩现象。以下是详细解释:
如需进一步了解具体应用场景或计算方法,可参考材料科学相关文献或工程手册。
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