What are the properties of ductile iron?

Ductile iron—also referred to as spheroidal or nodular iron—is actually a group of irons that exhibit high strength, flexibility, durability, and elasticity due to their unique microstructure. Cast ductile iron normally contains over 3 percent carbon; it can be bent, twisted, or deformed without fracturing.

What is austempered ductile iron used for?

Austempered Ductile Iron (ADI) has found successful applications across many industries, including Construction and Mining, Agriculture, Automotive, Heavy Truck, and Railroad. Typical applications include: Timing Gears.

Which factor controls the mechanical properties of ductile cast iron?

With a high percentage of graphite nodules present in the structure, mechanical properties are determined by the ductile iron matrix. The importance of matrix in controlling mechanical properties is emphasized by the use of matrix names to designate the following types of ductile iron.

What is ferrite ductile iron?

The Ferrite ductile iron (FDI) was successfully produced from ductile iron by heat treatment with 70% of ferrite area fraction. Due to transformation of matrix from pearlite to ferrite hardness drops and graphite area fraction increases.

What are the mechanical properties of cast iron?

A few common mechanical properties for cast iron include:

• Hardness – material’s resistance to abrasion and indentation.
• Toughness – material’s ability to absorb energy.
• Ductility – material’s ability to deform without fracture.
• Elasticity – material’s ability to return to its original dimensions after it has been deformed.

What elements are commonly alloyed with ductile iron?

Nickel, copper, and molybdenum are by far the most widely used alloying elements in both conventional and austempered ductile irons [5,8,14–25].

What is Austempering in heat treatment?

‘Austempering’ is the process of heat treatment where the steel is heated to austenitizing temperature, held there for sufficient period of time to produce homogeneous austenite.

Why is ductile iron better than cast iron?

Ductile iron has excellent corrosion resistance, tensile strength, and yield strength. Unlike cast iron, ductile iron does not break when it is bent, so it is more suited for high demand applications. Ductile iron is a strong and reliable material for pipes, fittings, and valves. One drawback is price.

What factor control the structure of cast iron?

The higher carbon content of cast iron means that it solidifies as a heterogeneous alloy, and therefore has more than one microcrystalline structure present in the material. It is the combination of high carbon content, and the presence of silicon, that gives cast iron its excellent castability.

What is the composition of ductile iron?

Chemistry. Like grey iron, ductile iron is an iron-carbon-silicon alloy. Typical carbon content is in the range 3 to 4%, while silicon content is slightly higher than grey iron at 2 to 3%. It is also common for ductile irons to contain significant additions of nickel.

Is 1865 a chemical composition?

Spheroidal or nodular graphite cast iron or ductile iron is a casting alloy of iron and carbon, carbon being present in the spheroidal form.

What is Austempered Ductile iron?

Austempered Ductile Iron (ADI) is a type of ductile iron that is characterised by increased toughness, tensile strength and wear resistance compared to normal ductile irons. These properties are achieved by heat treatment of an alloyed ductile iron using an austempering process.

What are the mechanical properties of alloyed ductile iron?

These properties are achieved by heat treatment of an alloyed ductile iron using an austempering process The mechanical properties of ductile iron and ADI are primarily determined by the metal matrix. The matrix in conventional ductile iron is a controlled mixture of pearlite and ferrite.

What is the difference between Adi and ductile iron?

The mechanical properties of ductile iron and ADI are primarily determined by the metal matrix. The matrix in conventional ductile iron is a controlled mixture of pearlite and ferrite. The properties of ADI are due to its unique matrix of acicular ferrite and carbon stabilized austenite; called Ausferrite.

What is the type of matrix in conventional ductile iron?

The matrix in conventional ductile iron is a controlled mixture of pearlite and ferrite.