Factors affecting the solidification of castings

- Jan 05, 2018 -

   Casting methods of solidification there are many. Casting in the solidification process, the section is generally divided into three areas: 1 - solid-phase zone 2 - solidification zone 3 - the liquid zone of the coagulation zone greater impact on the width of the coagulation zone, thus dividing the solidification method. First, the middle of the solidification: most of the solidification of the alloy layer by layer between solidification and pasty solidification. Second, layer by layer solidification: Pure metal, eutectic alloy has no solidification zone in the solidification zone, the cross-section liquid and solid two phases are clearly separated by one boundary. As the temperature decreases, the solid phase increases continuously and the liquid phase decreases. Direct center. Third, the paste-like solidification: alloy crystallization temperature range is very wide, in the solidification of a period of time, the casting surface does not exist solid layer, the solidification zone runs through the entire section, the first paste, after curing. Relevant experts said the factors that affect the way solidification of the casting summary: First, the temperature gradient of the casting. When the crystallization temperature of the alloy 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 coagulation zone. (Large temperature difference between inside and outside, fast cooling, freezing zone narrow). Second, the alloy's crystallization temperature range. Small range: narrow coagulation zone, the more inclined to layer by layer coagulation. Such as: sand casting, low carbon steel layer by layer solidification, high carbon steel paste solidification.

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