(b) When a Fe-0.4 wt% C steel is austenitised at 1000°C for 30 minutes and is slow cooled to room temperature we expect

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B When A Fe 0 4 Wt C Steel Is Austenitised At 1000 C For 30 Minutes And Is Slow Cooled To Room Temperature We Expect 1 (35.54 KiB) Viewed 10 times

(b) When a Fe-0.4 wt% C steel is austenitised at 1000°C for 30 minutes and is slow cooled to room temperature we expect eutectoid alpha-iron, pro-eutectoid alpha- iron and cementite to form. If instead a Fe-1.3 wt% C steel is austenitised at 1000°C for 30 minutes and is slow cooled to room temperature we expect alpha- iron, eutectoid cementite and pro-eutectoid cementite to form. Use the equilibrium phase diagram together with the lever rule to describe as quantitatively as possible the key difference in terms of phases, phase fractions and microstructure between these alloys. Include sketches which illustrate (i) the stages in the development of the microstructures and (ii) the mechanisms of the phase transformations. [13 marks]