Characteristics of forgings and castings
Compared with castings, metals can improve their microstructure and mechanical properties after forging. After the hot-working deformation of the cast structure by the forging method, the original coarse dendrites and columnar grains become the equiaxed recrystallized structure with fine grains and uniform size due to the deformation and recrystallization of the metal, so that the original segregation in the steel ingot, The compaction and welding of loose, stomata and slag inclusions make the structure more compact and improve the plasticity and mechanical properties of the metal.
The mechanical properties of castings are lower than those of forgings of the same material. In addition, the forging process can ensure the continuity of the metal fiber structure, so that the fiber structure of the forging is consistent with the shape of the forging, and the metal streamline is complete, which can ensure the good mechanical properties and long service life of the part by precision die forging and cold extrusion. Forgings produced by processes such as warm extrusion are incomparable to castings.
A forging is an object to which a metal is pressed to shape a desired shape or a suitable compressive force by plastic deformation. This power is typically achieved by using a hammer or pressure. The forging process creates a refined grain structure and improves the physical properties of the metal. In the practical use of components, a correct design enables the particles to flow in the direction of the main pressure. The casting is a metal molded object obtained by various casting methods, that is, the smelted liquid metal is poured into a pre-prepared mold by pouring, injecting, inhaling or other casting method, and after cooling, after falling sand, cleaning and then Processing, etc., the resulting article with a certain shape, size and performance.