Using the continuous-cooling transformation diagram for a eutectoid Fe-C alloy shown below, perform the following tasks. (a) Plot the cooling curve (rough position) corresponding to normalising treatment, and specify the microstructure obtained. (b) Plot the cooling curve (rough position) corresponding to full annealing, and specify the microstructure obtained. (c) Design a heat treatment to produce a duplex microstructure of about half pearlite and half tempered martensite, specifying all the steps and plotting, roughly, the cooling curve involved. (d) If a full (i.e. 100%) tempered martensitic microstructure is desirable, describe the conditions for achieving it in terms of both cooling rate and sample size. (e) What treatment do you propose to do if a fully annealed steel is still too hard for processing (e.g. forging)? Plot the microstructure after such a treatment, marking any dimension that is important.

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A:

Q: Describe the phases present at the eutectic temperature when the overall composition is x(Cu)= 0.5

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A:

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Q: iron-carbon alloy

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Q: 5

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Strengthening of Alloys

Strengthening of the alloys is required as metals become weak due to various lattice defects, metal bonding phenomena. The strength of the metals is not enough for any mechanical work. The internal dislocations of any metals arise due to forming processes. Due to the movement of these dislocations, the metals are plastically deformed.