
[冶] 凝固收縮
The solidification shrinkage mechanism of unsaturated polyester resin is analysized by using free Volume theory in this paper.
本文用自由體積理論分析了不飽和聚酯樹脂的固化收縮機理。
The effects of casting modulus, pouring temperature. carbon equivalent and mould toughness on the solidification shrinkage of ductile cast iron was investigated experimentally.
實驗測定了化學成分、澆注溫度、鑄件模數和鑄型剛度對球墨鑄鐵收縮特性的影響。
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.
主要是明顯的尺寸效應和凝固、收縮、應力等問題,避免或減少鑄鐵井蓋的成分偏析、變形、開裂等缺陷的産生。
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.
得到有益于認識鑄件中此類接頭凝固特性和熱節位置的變化規律,對工藝設計者認識和防止成型過程中産生凝固收縮缺陷是很必要的。
They also undergo a high shrinkage or reduction in volume during solidification.
它們在固化過程中收縮較大或體積減少較多。
|contraction of solidification;[冶]凝固收縮
solidification shrinkage(凝固收縮) 是材料科學和鑄造工藝中的核心概念,指液态金屬或合金在冷卻凝固過程中因相變(液态→固态)導緻的體積縮小現象。這種收縮源于原子排列方式的根本變化:液态時原子無序排列、間距較大,而固态晶體結構中原子排列緊密有序,密度顯著增加。
物理本質
凝固時原子從液态的短程有序轉變為固态的長程有序晶格,原子間距減小,宏觀表現為體積收縮。收縮量取決于材料類型(如鑄鐵收縮率約1.8%,鑄鋁約6%)和冷卻條件。
工業影響
若收縮得不到有效補償,會在鑄件内部形成縮孔(shrinkage cavity)或縮松(porosity),顯著降低力學性能和密封性。例如,發動機缸體鑄造中,凝固收縮缺陷可能導緻冷卻液滲漏。
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solidification shrinkage 是材料科學和工程領域的術語,指物質在凝固(從液态轉變為固态)過程中因相變或結構變化導緻的體積收縮現象。以下是詳細解釋:
如需進一步了解具體應用場景或計算方法,可參考材料科學相關文獻或工程手冊。
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