Q5 (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 1. Microstructure, 2. Process (phase equilibrium diagram). 3. Mechanical properties and thus 4. Applications. Include in your answer the 'Steel Section' of the Iron-Carbon phase equilibrium diagram and the terms, pearlite, ferrite, cementite, and austenite.