Question

4. a) Consider a high carbon steel that contains 1.4 wt% C that is initially held at 1100°C to form 100% austenite. The steel is then cooled quickly to 875°C and held at that temperature. Describe the phase transformation that occurs. Be as specific as possible. Also sketch the microstructure and the 1D composition profile during growth in the vicinity of the interface. b) Would there be any difference in microstructure if the steel was held at 775°C instead of 875°C? Explain.

          4. a) Consider a high carbon steel that contains 1.4 wt% C that is initially held at 1100°C to
form 100% austenite. The steel is then cooled quickly to 875°C and held at that temperature.
Describe the phase transformation that occurs. Be as specific as possible. Also sketch the
microstructure and the 1D composition profile during growth in the vicinity of the interface.
b) Would there be any difference in microstructure if the steel was held at 775°C instead of
875°C? Explain.

Added by Celia D.

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