Click here casting production, casting gas porosity, and casting shrinkage cavity are sometimes associated, sometimes in separate groups. When gas porosity and shrinkage cavity occur, we quickly determine whether the defect is a gas porosity or a shrinkage cavity is necessary to solve the problem. To quickly judge these two defects, you know their characteristics well at first. Today, we teach you […]
Casting is the process of melting the metal into a required liquid and pouring it into the mold. After cooling, solidifying and cleaning, a casting (part or blank) with a predetermined shape, size and properties can be obtained It is the basic technology of modern machinery manufacturing industry. The cost of casting blank is low, […]
EUTECTIC TRANSFORMATION OF NODULAR CAST IRON The eutectic transformation of spheroidal graphite cast iron is not as obvious as that of gray iron, although graphite is first precipitated and austenite is then precipitated, graphite plays a less dominant role in the Eutectic Solidification process coexisting and coexisting under conditions of common and liquid contact.
Morphology of primary AUSTENITE DENDRITE The Crystal Lattice of austenite is face-centered cubic. When the AUSTENITE is nucleated and grown directly from the liquid iron, the AUSTENITE is stable only when the surface energy is minimum and octahedral crystal is formed. Then, because the concentration gradient of solute in the liquid iron at the edge […]
Second. Primary AUSTENITE DENDRITE IN CAST IRON Due to the mechanical properties, Gray cast iron is usually hypoeutectic, and there will be primary austenite dendrite in solidification structure. Under the condition of special properties of cast iron (such as high thermal conductivity and good shock absorption), gray cast iron with near Eutectic or hypereutectic composition […]
2. UNIDIRECTIONAL NUCLEATION In the solidification process of the metal-nonmetal system, the nonmetallic substance can be the core of metal solidification, while metal cannot be the core of nonmetallic substance solidification, which is called One-way nucleation.
The final properties of iron castings are mainly determined by the structure formed during solidification. For example, the thermal properties of gray iron are affected by the shape, size, and quantity of graphite in its structure. The mechanical properties depend on the number of primary Austenite Dendrites, the morphology of graphite and the size of […]
1.First of all, matching with the product should be considered when choosing the production line of the sand-coated iron mold. 2. Iron sand-coated production line should have: A high-quality iron sand-coated production line must have the primary factors of the high running rate of equipment, mature technology, high rate of the genuine product.