There are many ways to solidify castings. In the process of solidification of castings, the section is generally divided into three sections: 1.solid phase zone 2.coagulation zone 3.the liquid phase zone.the greater influence on the solidification zone is the width and narrowness of the solidification zone, and the solidification mode is divided accordingly.
First, intermediate solidification: the solidification of most alloys is between layer-by-layer solidification and paste-like solidification. Second, layer-by-layer solidification: pure metal, eutectic alloy has no solidification zone during solidification, and the cross-section liquid and solid phase are clearly separated by a boundary. As the temperature decreases, the solid phase layer increases continuously, and the liquid phase layer decreases continuously. Direct to the center. Third, paste solidification: the alloy has a wide crystallization temperature range. During a certain period of solidification, there is no solid layer on the surface of the casting. The solidification zone runs through the entire section, first paste, and then solidify. Relevant experts said that the factors affecting the solidification mode of castings are summarized: first, the temperature gradient of the castings. When the alloy crystallization temperature range is constant, the width of the solidification zone depends on the temperature gradient of the inner and outer layers of the casting. The smaller the temperature gradient, the wider the solidification zone. (The temperature difference between inside and outside is large, the cooling is fast, and the solidification zone is narrow). Second, the crystallization temperature range of the alloy. The range is small: the solidification zone is narrow, and the more it tends to solidify layer by layer. Such as: sand casting, low carbon steel layer by layer solidification, high carbon steel paste solidification.
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Centrifugal Castings,Open Closed Die Casting,Zinc Die Castings,Heat Treated Castings,Machined Castings,Magnesium Castings Specification of Centrifugal Castings: Iron Casting has a wide range of mechanical properties which make them suitable for use in engineering components. The wide spread use of cast iron is as a result of its low cost and versatile properties. Ductile Iron castings are […]