Analysis of casting solidification

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Quality of the casting and the casting process is closely related to the influence of the solidification of castings. Substances from liquid into solid process called coagulation. Are crystals of solid metal casting, so the metal solidification process known as crystallization. The quality of the casting and mechanical properties depends largely on the proportion of columnar grains and equiaxed grains. steel casting foundry
The casting is cylindrical products whether or equiaxed grains, in addition to the composition of cast alloys, the solidification of the casting. Casting during the solidification process, in addition to pure metals and eutectic composition alloy, generally there are three regions, namely, the solid phase, the solidification and liquid region. Depending on the solidification zone width, the solidification of castings can be divided into the layer by layer solidification of mushy solidification and intermediate solidification in three ways.steel castings manufacturers

2.1 layer by layer solidification of pure metals and eutectic a lloys and the narrow range of crystallization temperature alloys, such as gray cast iron, alloy, silicon brass and low carbon steel, etc., tend to layer by layer solidification mode. Feature is close to the mold wall of the outer layer alloy, once cooled to the temperature of the freezing point or eutectic point in the above-mentioned temperature above the inner layer alloy is still liquid. Solid-liquid interface is clear, smooth, there is no solid-liquid staggered. With the heat transfer to the type of wall, the temperature is falling, another layer of crystalline solid formed. So the solidification process continues, the columnar grain growth within the liquid, until conflict with each other so far. Section heart not yet solidified by the Ministry of liquid metals and low melting point impurities, columnar grains closed.investment casting

2.2 mushy solidification crystallization temperature range of alloys, copper alloys such as aluminum, bronze and ductile iron, high carbon steel, etc., tend to paste solidification mode. Another batch of crystal, these alloys are cooled to the liquidus temperature, the crystallization of the first batch of grain is around the rest of the liquid alloy surrounded by crystal growth is relatively uniform in all directions; temperature decline following the cluster of newly formed particles but also surrounded by the liquid alloy, which makes small grains flooded the section, the solid-liquid staggered, and ultimately generate coarse equiaxed grains in the whole section of the casting; not yet solidified liquid alloy, are a large number of equiaxed grains closed.steel castings

2.3 intermediate solidification of carbon steel, white iron, as well as some special brass, etc., tend to solidification mode in the middle. Between the layer by layer solidification and mushy sol idification, both columnar crystal there, equiaxed grains. Alloy castings solidification zone is not static, it is with the casting temperature, that affect the casting temperature gradient factors affect the coagulation zone size. For example, some alloys manufactured in the sand was the middle of solidification into a metal casting solidification zone width can be reduced