Question:
Pearlitic content of normalized steel is slightly higher than slowly cooled steel, because:
Pearlitic content of normalized steel is slightly higher than slowly cooled steel, because:
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In phase transformation of steels, moderate cooling can shift the eutectoid transformation to favor more pearlite by affecting the transformation kinetics and the effective composition range.
Updated On: Jun 20, 2025
- Cooling rate shifts the eutectic point towards left side
- Cooling rate increases the carbon concentration
- More diffusion due to faster cooling
- Cooling rate reduces the nucleation sites
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The Correct Option is A
Solution and Explanation
Normalized steel is cooled in air at a moderate rate, which is faster than furnace cooling but slower than quenching. This rate of cooling influences the phase transformation during solidification.
The cooling rate in normalization affects the phase diagram behavior, effectively shifting the eutectoid point slightly towards the left. As a result, slightly more pearlite is formed compared to very slowly cooled steel, which may allow for the formation of other microstructures like ferrite or coarse pearlite.
This shift in the transformation point increases the fraction of austenite transforming into pearlite before room temperature is reached. Hence, normalized steel ends up with a slightly higher pearlite content.
The cooling rate in normalization affects the phase diagram behavior, effectively shifting the eutectoid point slightly towards the left. As a result, slightly more pearlite is formed compared to very slowly cooled steel, which may allow for the formation of other microstructures like ferrite or coarse pearlite.
This shift in the transformation point increases the fraction of austenite transforming into pearlite before room temperature is reached. Hence, normalized steel ends up with a slightly higher pearlite content.
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