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2021
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What is ductile iron?
Ductile iron is a high-strength cast iron material developed in the 1950s, and its comprehensive performance is close to that of steel. It is based on its excellent performance that it has successfully cast some parts with complex force, high strength, high toughness, and high wear resistance.
Ductile iron is a high-strength cast iron material developed in the 1950s, with comprehensive properties close to steel. Based on its excellent performance, it has been successfully used to cast parts with complex forces, high strength, toughness, and wear resistance. Ductile iron has rapidly developed into the most widely used cast iron material after gray cast iron. The so-called 'using iron to replace steel' mainly refers to ductile iron.
Ductile iron obtains spherical graphite through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, and obtains higher strength than carbon steel.
What is the development history of ductile iron?
Réaumur in France produced malleable cast iron in 1722. Later, Seth Boyden of the United States invented black heart malleable cast iron in 1826.
Until the 1920s, due to research and progress in the main components of cast iron such as carbon and silicon, as well as the influence of other alloying elements, melting methods, and inoculation effects, so-called cast iron appeared. As a result, the material was considerably improved and the scope of application was expanded to a certain extent. However, due to the fundamental disadvantage of low human nature, it failed to rapidly expand the scope of application.
In 1947, Morrogh of the British Cast Iron Research Association discovered cast iron with spherical graphite in the as-cast state.
In 1948, ductile iron was made by adding Ce to high-carbon, low-sulfur, and low-phosphorus gray cast iron, with the remaining amount maintained at 0.02% or more. Almost simultaneously, GAGNEVIN et al. of the American International Nickel Company (INCO) added MM to cast iron.
During World War II, there were insufficient chromium resources to produce wear-resistant martensite, and researching alternative elements for Cr became a top priority. Therefore, a systematic investigation was conducted on whether various metals and transition metals that chemically combine with carbon form carbides, including magnesium. When adding magnesium, Cu80 1 Mg20 alloy and Ni80-M920 alloy were used to slow down the violent bouncing. The results showed that magnesium, as an alternative element to chromium, not only had good effects, but also had a significant desulfurization effect when magnesium had a certain residue in the molten iron. Based on these new findings, the effect of adding magnesium to gray cast iron after white cast iron was also studied. Adding 0.5% Mg to gray cast iron including C 3.5%, Si2.25%, Ni 2%, its tensile strength far exceeded the original prediction (general gray cast iron is about 13kgf/mm2), reaching 78kgf/mm2.
What are the constituent components of ductile iron?
Ductile iron is an iron-carbon alloy with a carbon content exceeding 2.11%. Industrial pig iron, scrap steel, and other steel and alloy materials are obtained through high-temperature melting and casting. In addition to Fe, the carbon in other cast irons is precipitated into graphite form. If the precipitated graphite is in the form of engraving, the cast iron is called gray cast iron or gray cast iron, the cast iron in the form of worms is called soft ink bead iron, and when it flows into lumps, the chemical composition of cast iron other than malleable ductile iron is generally 3.0% to 4.0% carbon, 1.8% to 3.2% silicon, less than 3.0% total manganese, phosphorus, and sulfur, and an appropriate amount of rare earth, magnesium, and other spheroidizing elements.
Ductile iron
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