Using the continuously-cooling transformation diagram for an iron-carbon alloy o

Question

Using the continuously-cooling transformation diagram for an iron-carbon alloy of eutectoid compostion, specify the the nature (name) of the final microstructure of a small specimen that has been subjected to the following continuously cooling process. In each case, assume that the specimen begins at 760C and that it has been at this temperature long enough to have achieved complete and homogeneous austenitic structure microstructure of a small specimen that has been (al Cooling at 150 Cs for 10s, (b) cooling at 100C/s for 100s, e)cooling at 20 s for 10000s

Explanation / Answer

First draw the slope line in the graph to get the structure.

ANSWERS

1) Martensite (It will fall in inside red region)

2)Martensite+pearlite (it will fall in red and blue region between)

3)Pearlite (it will fall right side of blue region)

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