Method for improving structure performance of nodular cast iron

Abstract

The invention discloses a method for improving the structure performance of nodular cast iron, and relates to the technical field of cast iron. The method comprises the following steps: introducing graphene composite particles into the nodular cast iron to obtain a finished nodular iron casting product; according to the introduction step, the graphene composite particles subjected to ball millingtreatment are added to molten-state nodular cast iron; the ball milling treatment is mixing and ball-milling treatment of iron powder and the graphene composite particles; and the addition quantity ofthe graphene composite particles in the finished nodular iron casting product is 0.25wt.%-0.33wt.%. The graphene composite particles prepared with the method can remarkably increase the spheroidization rate of the nodular cast iron, graphite nodules are rounded through improvement of the spheroidization rate, in the solidification process, graphite distortion mainly occurs in the growth process of spherical graphite in molten iron, and the probability of distortion can be reduced through reduction of the growth rate, therefore, through introduction of the graphene composite particles preparedwith the method, the spheroidization rate of nodular cast iron can be greatly increased, and the mechanical property of the nodular cast iron 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