Foundry: What are the differences between gray cast iron, ductile cast iron, and compacted graphite iron?

Foundry

Foundry: Different forms of graphite in cast iron 1. The graphite in gray cast iron is flaky. 2. The graphite in ductile iron is spherical. 3. The graphite in vermicular cast iron is vermicular.

I. Foundry : The morphology of graphite in cast iron is different

1. The graphite in gray cast iron is flaky;

2. The graphite in ductile iron is spherical;

3. The graphite in vermicular cast iron is worm-like;

II. Different formation

1. Gray cast iron: Formed by the graphitization process when the molten iron cools slowly, it is composed of flaky graphite and matrix structure;

2、 Ductile iron : It is obtained after spheroidizing and inoculating the molten iron, and has high tensile strength;

3. The production of vermicular cast iron is achieved by adding a certain amount of vermicular agent to the molten iron for furnace pretreatment;

III. Foundry: Different applications

1. Gray cast iron is used in machine tool beds, guide rails, cylinder blocks, etc.

2. Ductile iron replaces some cast steel and forged steel parts, such as crankshafts, connecting rods, rolls, automobile rear axles, etc.;

3、 Vermicular cast iron has better strength, plasticity and toughness than gray cast iron, and is used in high-pressure heat exchangers, cylinder heads, hydraulic valves, etc.;

IV. Performance differences

Gray cast iron The graphite in the middle is flaky. Because stress concentration is easily caused at the two tips of the flaky graphite, which induces cracks and causes brittleness, the mechanical properties are worse than the other three types of cast iron. However, the shock absorption performance caused by flaky graphite is better than the other three types of cast iron.

Vermicular cast iron is formed by adding inoculants and spheroidizing agents to ordinary cast iron during casting. The graphite is worm-like. Although it does not have the more significant defects of graphite structure in gray cast iron and malleable cast iron, the worm-like graphite has long and wide characteristics, which inevitably cuts the matrix structure and causes the structure to have defects similar to voids. Therefore, although the performance is slightly higher than gray cast iron and malleable cast iron, it is lower than ductile iron.

Foundry: The graphite in ductile iron is spherical. Although it also serves as a void defect that cuts the matrix structure, the stress concentration caused by the graphite agglomerating into spheres on the matrix structure is small, and the tendency to induce cracks is reduced. Therefore, the mechanical properties are better than the first three types of cast iron.

Ductile iron, gray iron, foundry, compacted graphite iron

Foundry: Introduction to the Matrix Structure and Casting Performance of Compacted Graphite Iron

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Foundry: Introduction to the Matrix Structure and Casting Performance of Compacted Graphite Iron

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