The cross-section of a thermo-mechanically treated (TMT)

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The cross-section of a thermo-mechanically treated (TMT) reinforcing bar has

1. soft ferrite-pearlite throughout
2. hard martensite throughout
3. a soft ferrite-pearlite core with a hard martensitic rim
4. a hard martensitic core with a soft pearlite-bainitic rim

Correct Option: C

a soft ferrite-pearlite core with a hard martensitic rim