HKIE Professional Assessment - Materials Discipline Practice Questions - HKIE Professional Assessment - Materials Discipline (Hong Kong Institution Of Engineers) Exam

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On a Time-Temperature-Transformation (TTT) diagram for a plain carbon steel, what physical phenomenon occurs at the 'nose' of the C-curve?

The thermodynamic driving force is zero. The rate of atomic diffusion is infinitely fast. The overall transformation rate reaches its maximum due to the balance between thermodynamic driving force and atomic mobility. Austenite transforms instantaneously into 100% martensite.

Correct Answer:

The overall transformation rate reaches its maximum due to the balance between thermodynamic driving force and atomic mobility.

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