Product Introduction
Inoculant: Inoculant treatment refers to the addition of a small amount of other substances to the liquid metal during the solidification process to promote nucleation, inhibit growth, and achieve the purpose of refining grains. Traditionally, adding additives to cast iron is called inoculation treatment; Adding additives to non-ferrous alloys is called metamorphic treatment. In essence, inoculation mainly affects nucleation and promotes grain ionization. However, the metamorphic treatment changes the growth mechanism of the crystal (inhibiting growth), thus affecting the crystal morphology.
The mechanical properties of gray cast iron largely depend on its microstructure. Gray cast iron without inoculation treatment has unstable microstructure, low mechanical properties and white marks on the thin wall of castings. In order to ensure the consistency of casting quality, inoculation treatment is essential.
The inoculant used in the inoculation treatment of cast iron, adding a small amount, has little effect on the chemical composition of cast iron, but has a great effect on its microstructure, so it can improve the mechanical properties of gray cast iron, and has a significant impact on its physical properties. Good incubation treatment has the following effects:
◆ Eliminate or reduce white mouth tendency;
◆ Avoid supercooled tissue;
◆ Reduce the wall thickness sensitivity of cast iron, so that the difference in microstructure between thin and thick sections of castings is small, and the difference in hardness is small;
◆ Conducive to eutectic group nucleation, so that the number of eutectic group increase;
◆ The form of graphite in cast iron is mainly fine and evenly distributed A-type graphite, thereby improving the mechanical properties of cast iron.
The flow of well-bred cast iron is better, the shrinkage of castings is reduced, the processing performance is improved, and the residual stress is reduced.
Product details
