Q$5($a$)$ With regards to engineering materials explain the term structure'.

$($b$)$ Different analytical techniques can be used to examine the structure of engineering materials. Outline $5$ of these and give the structural features that they can examine.

$($c$)$ Explain the importance of carbon concentration in plain carbon steels on the

Microstructure,

Process $($phase equilibrium diagram$).$

Mechanical properties and thus

Applications.

Include in your answer the 'Sieel Section' of the Iron$-$Carbon phase equilibrium diagram and the terms, pearlite, ferrite, cementite, and austenite.