(Solved): The figure below shows the Time-Temperature-Transformation Diagram for a coarse-grained, plain-carb ...

The figure below shows the Time-Temperature-Transformation Diagram for a coarse-grained, plain-carbon steel of eutectoid composition. Samples of the steel are austenitised at \( 850^{\circ} \mathrm{C} \) and then subjected to the quenching treatments shown on the diagram. Describe the microstructure produced by each heat treatment from a to \( \mathrm{f} \).