Compute the volume percent of graphite, VGr, in a 3.2 wt% C cast iron, assuming that all the carbon exists as the graphite phase. Assume densities of 7.9 and 2.3 g/cm3 for ferrite and graphite, respectively.

Following are the solution to the given points:

From diagram.  

Calculating the weight fraction of graphite:  

Calculating the volume percent of graphite:

Therefore, the final answer is "0.964, 0.036, and 11.368%"

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The volume percentage of graphite is 10.197 per cent.

Explanation:

The volume percent of graphite is the ratio of the volume occupied by the graphite phase to the volume occupied by the graphite and ferrite phases. The weight percent in the cast iron is 3.2 wt% (graphite) and 96.8 wt% (ferrite). The volume percentage of graphite is:

Where:

- Volume occupied by the graphite phase, measured in cubic centimeters.

- Volume occupied by the graphite phase, measured in cubic centimeters.

The expression is expanded by using the definition of density and subsequently simplified:

Where:

, - Masses of the ferrite and graphite phases, measured in grams.

- Densities of the ferrite and graphite phases, measured in grams per cubic centimeter.

If , , and , the volume percentage of graphite is:

The volume percentage of graphite is 10.197 per cent.

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