#1) Gray Cast Iron. All the ferrous metals are extracted from the Pig iron by re-melting the pig iron with coke and limestone in a furnace. How much graphite is present, the length of the flakes and how they are distributed in the matrix directly influence the properties of the iron. If the carbon precipitates as carbide, the casting is said to be 'white iron' because the fracture has a shiny white appearance. As the lack of ductility is caused by the coarse graphite flakes, the graphite clusters in malleable irons, and the nodular graphite in SG irons, give significantly higher ductility which improves the … Bagesh Bihari, Rahul Kumar*, Anil Kr Singh . The tips of the flakes act as preexisting notches; therefore, it is brittle. Gray iron castings are readily available in nearly all industrial areas and can be produced in foundries representing comparatively modest investments. National Institute of Foundry and Forge Technology, Hatia, Ranchi- 834003, India. The most common type, gray cast iron features a graphite microstructure consisting of many small fractures. The presence of graphite flakes makes the Grey Iron easily machinable as they tend to crack easily across the graphite flakes. So, the graphite flakes in Grey CI makes it brittle under tension. There are different types of Cast Iron are available. Cast iron is a Ferrous metal which is having iron as the main constituent. A way of controlling the microstructure of cast iron is through the control of cooling rates during solidification. The graphite flakes make the grey cast iron exhibit low shock resistance.
Microstructure of Gray Cast Iron The presence of graphite flakes is due to the addition of silicon, which acts to stabilise carbon in the form of graphite as opposed to iron carbide. Abstract— Unalloyed Gray cast iron is having very good compressive strength but poor tensile strength. Since then, it’s become an increasingly common type of metal.
Alloy Cast Iron Classification of Cast Irons is based on metallographic structure. In this article, we have discussed all the different cast iron types with their compositions. Grey iron also has very good damping capacity and hence it is mostly used as the base for machine tool mountings. Effect on the Mechanical Properties of Gray Cast Iron with Variation of Copper and Molybdenum as Alloying Elements . National Institute of Foundry and Forge Technology, Hatia, Ranchi- 834003, India. The speckled white regions represent a phosphide eutectic. I bought a brand new Lodge 12" cast iron pan, washed it in soap and warm water and dried it with a paper towel thoroughly. To control cooling rate, the heat storage capacity (HSC) of the mould is important. While all cast iron has a carbon content of over 2%, though, there are several different types of cast iron, each of which is unique.
Then I applied a thin layer of canola oil with a paper towel (paper towel was clean - not black after this application) and then heated the empty pan on my electric stove for 15-20 minutes.
Grey cast iron typically has a composition of 2.5 wt.% – 4.0 wt.% carbon and 1.0 wt.% – 3.0 wt.% silicon .
Spheroidal Graphite (SG) / Ductile Cast Iron / Nodular Cast Iron (free carbon as spheroids) 6. Thus, malleable cast iron derives its name from its ability to bend or undergo permanent deformation before it fractures. The fractured cast iron is greyish in colour, which also gives it the name. Grey cast iron, Fe-3.2C-2.5Si wt%, containing graphite flakes in a matrix which is pearlitic. iron.
Mechanical Properties of Gray Iron. Instead, as the material breaks the graphite initiates numerous new cracks. To combat this, we change the morphology of graphite following some methods during production. The graphite particles in CGI are randomly oriented and elongated as in grey iron, but they are shorter, thicker and have rounded edges. Etchant: Nital 2% The speckled white regions represent a phosphide eutectic. Grey Cast Iron (Flake Graphite) 5. This practice resulted in a change in the morphology of graphite which led to the creation of various types of CI. For example, grey cast iron is inherently brittle and often cannot withstand stresses set up by a cooling weld.
If the carbon is precipitated as flake graphite, the casting is called 'grey iron', because the fractured surface has a dull grey appearance due to the presence of about 12% by volume of graphite.
Microscopically, all gray irons contain flake graphite dispersed in a silicon-iron matrix.
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