What is compacted graphite cast iron used for?

Applications. The first commercial application for compacted graphite iron was for the brake discs for high-speed rail trains. More recently compacted graphite iron has been used for diesel engine blocks.

What is flake graphite cast iron?

Flake graphite cast iron is predominantly produced with pearlitic structures, with the classification of grades being primarily determined by the graphite quantity and graphite shape and thus eventually by the carbon content.

What are the material 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 affects the mechanical properties of graphite cast iron?

The size, distribution, and shape of the incorporated graphite particles in gray cast iron significantly affect the mechanical properties of product.

How strong is compacted graphite iron?

While not quite as strong as ductile iron, CGI is 75 percent stronger and up to 75 percent stiffer than gray iron. The thermal and damping characteristics of CGI are midway between ductile and gray iron.

How is compacted graphite iron made?

Similar to ductile iron, compacted graphite iron is produced by adding magnesium to a desulfurized base iron. As shown in Figure 3, CGI is stable over a range of approximately 0.008% magnesium (Mg), which is approximately five times smaller than the commercially used Mg-range for ductile iron.

What is SGI material?

SG Iron is also known as Ductile Cast Iron, Nodular Cast Iron, Spheroidal Graphite Iron and Spherulitic Cast Iron. This grade of Iron was developed over 60 years ago and in the USA. The main characteristic of this material is the structure of the graphite.

What are the properties of GREY cast iron?

Gray cast iron characterized by flake graphite has certain strength, hardness, modulus of elasticity, shock absorption, wear resistance and thermal conductivity, especially with excellent casting performance, good cutting performance and low casting cost. So far, it is still the most widely used cast iron in the world.

What is the unique property of cast iron?

Cast Iron is a metal bearing high strength in compression but weak in tension. It is hard and brittle. So, it cannot be forged.

What are the four types of cast iron?

There are four basic types of cast iron – white iron, gray iron, ductile iron and malleable iron

white iron.
gray iron.
ductile iron.
malleable iron.

What factors control the structure of cast iron?

The final structure and properties of austempered ductile iron are dependent on the following metallurgical factors: – microstructure of initial nodular cast iron; – basic chemical composition; – austenitization temperature and holding time at this temperature; – cooling rate to the temperature of isothermal …

Is compacted graphite iron stronger than cast iron?

Compacted graphite iron has 80 percent more tensile strength, 40 percent more stiffness and double the fatigue strength of regular cast iron. Audi will use compacted graphite iron for all of its V-configuration engines, said Richard Bauder, head of Audi’s diesel engine development at Neckarsulm, Germany.

What is spherical graphite?

Spherical graphite is the product that most graphite companies are hoping they will be economically able to produce in line with an expected battery demand boom from portable devices and, more importantly, electric vehicles. The process is well known now, but only China produces spherical graphite in commercial volumes.

Does graphite contain iron?

In metallurgy: Grain size …casting, the result is a “spheroidal graphite” iron, in which graphite appears as spherical nodules and ductility is greatly increased. If the molten iron is chill cast (i.e., rapidly cooled), it will form a “white” iron containing about 60 percent cementite, or iron carbide.

Is ductile iron cast iron?

Ductile iron, also known as ductile cast iron, nodular cast iron, spheroidal graphite iron, spheroidal graphite cast iron and SG iron, is a type of graphite-rich cast iron discovered in 1943 by Keith Millis. While most varieties of cast iron are weak in tension and brittle, ductile iron has much more impact and fatigue resistance, due to its nodular graphite inclusions.

What is grey cast iron?

Micrograph of grey cast iron. Gray iron, or grey cast iron, is a type of cast iron that has a graphitic microstructure. It is named after the gray color of the fracture it forms, which is due to the presence of graphite. It is the most common cast iron and the most widely used cast material based on weight.