Creeping agent for pearlite type vermicular cast iron member

Abstract

The invention discloses a vermiculizer for pearlite type vermicular cast iron. The vermiculizer comprises the following components in weight percentage: 10 to 30 percent of rare earth, 2 to 8 percent of magnesium, 35 to 50 percent of silicon, 1 to 3 percent of aluminum, 10 to 15 percent of phosphorus, 10 to 30 percent of copper, and the balance being iron. The adoption of phosphorus and iron aims to form evenly distributed iron phosphide eutectic in the vermicular cast iron, which improves the wearing resistance of the vermicular cast iron; and the addition of electrolytic copper aims to increase the pearlite content of the vermicular cast iron. By using the vermiculizer, the high strength and high hardness vermicular cast iron of which the vermicular graphite percentage is more than 80 percent and the basal body is the pearlite can be effectively produced. The vermiculizer has the advantages of simple use, obvious effect and stable vermicular graphite.

Description

technical field [0001] The invention relates to a vermicular agent for cast iron. Background technique [0002] The graphite form of vermicular graphite cast iron is between flake and spherical, and it is worm-like. The process performance and metallographic structure of vermicular graphite cast iron are also between gray cast iron and nodular cast iron, but the mechanical properties are close to nodular cast iron. The outer edge of worm-like graphite is wavy and curved, and the bite with the metal substrate is better than that of gray cast iron. Graphite is difficult to peel off, which is beneficial to anti-friction, oil storage and heat conduction. Therefore, vermicular graphite cast iron has better anti-friction than gray cast iron Performance, strength and toughness are slightly higher than ordinary gray cast iron; graphite in vermicular graphite cast iron is worm-like, compared with spherical graphite in ductile graphite iron, the contact surface is wider, so the wear r...

AI Technical Summary

Problems solved by technology

Second, experiments have shown that due to the concentration segregation of alloying elements, it also leads to the tendency of ferriteization in the eutectic cluster

Therefore, the matrix of vermicular graphite cast iron is usually mainly ferrite, which cannot meet the needs of some high-demand parts.

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