A Method for Improving the Microstructure and Properties of Ductile-Grinded Cast Iron

Abstract

The invention discloses a method for improving the structure and performance of ductile cast iron; it relates to the technical field of cast iron, and introduces graphene composite particles into ductile cast iron to obtain finished ductile iron castings; the introduction is added to molten ductile cast iron after ball milling treatment Graphene composite particles; the ball milling process is mixed ball milling of iron powder and graphene composite particles; the added amount of graphene composite particles in the finished ductile iron casting is 0.25-0.33wt.%; the graphite prepared by the inventive method Graphene composite particles can significantly improve the spheroidization rate of nodular cast iron. By improving the spheroidization rate, the graphite spheres are more rounded. During the solidification process, graphite distortion mainly occurs during the growth of spheroidal graphite in molten iron. Among them, the reduction of growth rate can reduce the probability of distortion. Therefore, by introducing the graphene composite particles prepared by the present invention, the nodularization rate of ductile iron can be greatly increased, and its mechanical properties can be further improved.

Description

technical field [0001] The invention belongs to the technical field of cast iron, in particular to a method for improving the microstructure and performance of ductile cast iron. Background technique [0002] Ductile cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some complex stress, strength, toughness, and wear resistance. Parts with high performance requirements. Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. The so-called "substituting iron for steel" mainly refers to ductile iron. [0003] Spheroidal graphite cast iron is obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially improves plasticity and toughness, thereby obtaining higher strength than carb...

AI Technical Summary

Problems solved by technology

[0004] The existing as-cast nodular cast iron has attracted much attention because of its relatively low production cost. However, with the continuous development of the economy, people have higher and higher requirements for the performance of as-cast nodular cast iron, and the existing technology produces The performance of as-cast ductile iron is average, and it needs to add a large amount of copper, nickel, molybdenum and other precious metals to improve its performance, resulting in a substantial increase in production costs