Thin-wall shock cooling part nucleating agent and preparing method and application of agent

Abstract

The invention discloses a thin-wall quenching piece nucleating agent which is prepared by the following materials in percentage by weight: 70 to 80 percent of Si, 0.6 to 1 percent of Sr, 0 to 3 percent of Ba, 0.9 to 1.4 percent of Al, 0.5 to 1.5 percent of ferroferric oxide and the balance Fe and unavoidable trace elements. After the adoption of the thin-wall quenching piece nucleating agent provided by the invention, the overall performance of a casting is improved, and the nucleating efficiency is improved.

Description

technical field [0001] The invention relates to the field of casting, in particular to an inoculant for a thin-walled quenching part and a preparation method thereof, as well as its application in the field of casting. Background technique [0002] The inoculant can promote graphitization, reduce the tendency of white mouth, improve the shape and distribution of graphite, increase the number of eutectic groups, refine the matrix structure, round the ductile iron graphite, reduce or eliminate chilling, and prevent free cementite on the surface Formation, uniform structure, improved mechanical properties and other advantages, it has been widely used in the field of casting. [0003] With the rapid development of material science and structural technology, thin-walled parts can have the characteristics of high strength, light weight, and high load-bearing capacity, and have been more and more widely used in industrial fields such as automobiles, national defense, and aerospace....

AI Technical Summary

Problems solved by technology

[0004] At present, most manufacturers use inoculants for thin-walled quenching parts as inoculants to produce thin-walled quenching parts, but these products have short incubation time, poor wear resistance, low hardness, low tensile strength, uneven cross-section, and easy to produce white spots. And other shortcomings, resulting in unstable products, unable to meet the requirements of some machine castings that require high hardness

[0005] In order to improve the above shortcomings, some manufacturers began to add other materials to the ferrosilicon inoculant to prepare composite inoculants, such as chromium, copper, etc. However, when adding the above materials, new problems will be introduced

For example, the addition of chromium will increase the probability of white structure formation, which will lead to a decrease in the hardness of thin-walled quenched parts. Adding copper will not only have no good effect on improving the performance of thin-walled quenched parts, but will greatly increase the cost of preparing inoculants.