Inoculant is a kind of material that can promote graphitization, reduce the tendency of white mouth, improve the morphology and distribution of graphite, increase the number of eutectic groups, and refine the matrix structure. It has a good effect in a short time (about 5-8 minutes) after inoculation. It is mainly applicable to the general natural parts in various situations or the later instantaneous inoculation.

Definition

Inoculation treatment refers to adding a small amount of other substances to the liquid metal during solidification to promote nucleation, inhibit growth and achieve the purpose of grain refinement. Traditionally, adding additives to cast iron is called inoculation treatment; Adding additives to non-ferrous alloys is called modification. In essence, inoculation treatment mainly affects nucleation and promotes grain dissociation; The modification is to change the growth mechanism of the crystal (inhibit growth), thus affecting the crystal morphology.

Functions

The mechanical properties of gray cast iron depend on its microstructure to a great extent. The gray cast iron without inoculation treatment has unstable microstructure, low mechanical properties, and white cast iron is easy to appear in the thin wall of the casting. In order to ensure the consistency of casting quality, inoculation treatment is essential.

The inoculant used for inoculation treatment of cast iron has little effect on the chemical composition of cast iron, but has a great effect on its microstructure. Therefore, it can improve the mechanical properties of gray cast iron and have a significant impact on its physical properties. Good inoculation treatment has the following functions:

◆ eliminate or reduce the tendency of white mouth;

◆ avoid supercooling;

◆ reduce the sensitivity of wall thickness of cast iron castings, so that the difference of microstructure and hardness between thin and thick sections of castings is small;

◆ it is conducive to nucleation of eutectic clusters and increase the number of eutectic clusters;

◆ the graphite in cast iron is mainly fine and evenly distributed type a graphite, so as to improve the mechanical properties of cast iron.

The cast iron with good inoculation has good fluidity, reduced shrinkage, improved machinability and reduced residual stress.

Tengzhou delifu supplies inoculants and nodulizer agents of various specifications