What percentage of carbon produces the strongest plain


1. (a) How are the following properties of iron affected when carbon is alloyed with it?

Illustrate your answer with reference to the microstructure of the steel.

- hardness
- strength
- ductility.

(b) What percentage of carbon produces the strongest plain carbon steel?

2. The ultimate tensile strength of a material was tested using 10 samples.

The results of the tests were as follows :

711 N mm-2, 732 N mm-2, 759 N mm-2, 670 N mm-2, 701 N 765 N mm-2, 743 N mm-2, 755 N mm-2, 715 N mm-2, 713 N mm-2.

(a) Determine the mean and standard deviation of these results.

(b) Express the values found in (a) in GPa.

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