Q1 (a) For all engineering materials the structure-process-property relationship is very important. For plain carbon ste

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Q1 A For All Engineering Materials The Structure Process Property Relationship Is Very Important For Plain Carbon Ste 1 (459.24 KiB) Viewed 7 times

Q1 (a) For all engineering materials the structure-process-property relationship is very important. For plain carbon steels which have been cooled under equilibrium conditions explain the relationship between the composition, phase equilibrium diagram, microstructure, properties (mechanical) and applications. (12 marks) (b) The following figure (Figure Q1) shows a Time Temperature Transformation diagram for an alloy steel. A component which in spherical shape and 100 mm in diameter is heated to 750°C until it is completely austenitic throughout is then dropped into water at 5°C. Choose three different cooling rates from the surface to the core of the sphere. With the corresponding Continuous Cooling Transformation diagram show and explain how the phases evolve with cooling for each of your three different cooling rates. (8 marks) (c) Using your three cooling curves what would the corresponding hardenability curve look like? Justify your decision. (5 marks) (25 marks) 800 1400 Eutectoid temperature 700 A+ F F+ P 1200 A+ F 600 A 1000 500 800 Temperature (°C) 400 Temperature (°F) A+B 50% 600 300 M(start) MA M(50%) M(90%) 400 200 100 M 200 0 1 10 10? 101 105 106 103 Time (s) Figure Q1. TTT Diagram for an alloy steel.