Anyang Lishi Industrial Co., Ltd

Inculation 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; The addition of additives to non-ferrous alloys is called metamorphism. Essentially, inoculation treatment mainly affects nucleation and promotes grain dissociation; Metamorphic treatment is to change the growth mechanism of the crystal (inhibit growth), thereby affecting the morphology of the crystal.
function
The mechanical properties of gray cast iron are largely determined by its microstructure. Gray cast iron without inoculation treatment has unstable microstructure, low mechanical properties, and white mouth is easy to appear on the thin wall of the casting. In order to ensure the consistency of the quality of the casting, inoculation treatment is essential [1].
The inoculant used in the inoculation treatment of cast iron is very small, which has little effect on the chemical composition of cast iron, but has a great impact on its microstructure, so it can improve the mechanical properties of gray cast iron and has a significant impact on its physical properties. Good inoculation treatment has the following effects:
◆ Eliminate or alleviate the tendency of white mouth;
◆ Avoid supercooling tissues;
◆ Reduce the sensitivity of wall thickness of iron castings, so that the difference in microstructure between thin and thick sections of castings is small, and the difference in hardness is also small;
◆It is conducive to the nucleation of eutectic clusters and increases the number of eutectic clusters;
◆ The form of graphite in cast iron is mainly fine and evenly distributed A-type graphite, so as to improve the mechanical properties of cast iron.
Well-conceived cast iron has better fluidity, reduced shrinkage, improved processing performance, and reduced residual stress of castings.