Figure 2 shows CCT curves for a eutectoid plain-C steel. What will be the final

Question

Figure 2 shows CCT curves for a eutectoid plain-C steel. What will be the final microstructures (phases present and approximate amounts) resulting from the various cooling curves shown in this diagram? B) Which is microstructurally more stable: pearlite or spheroidite and why? C) Compare strength and ductility of coarse pearlite, fine pearlite, and spheroidite. D) What microstructural changes happen to martensite during tempering? E) We have a component which is pearlitic, soft, and weak. Describe a procedure for strengthening this component. If instead we need to soften further the initial component, how can we do it? a of cu in AT C solid solution Coarse. Fine P so F

Explanation / Answer

The strength of pearlitic steel was clearly reduced by annealing, even though cementite stably maintained a lamellar structure.

in response, lattice strain of the ferrite phase in pearlite monotonically decreased with increasing annealing time.

as a result, a good linear relationship was established between the strength and ferrite lattice strain independent of the interlamellar spacing and morphology of cementite.

this suggests that the ferrite/cementite elastic misfit strain contributes to the high strength of pearlitic steel.

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