7. (8 pts) For the following transformations which are given in terms of microco

Question

7. (8 pts) For the following transformations which are given in terms of microconstituents: indicate whether the transformation will go in the direction shown at the temperature given, and if so, list the driving force for the transformation, if not, briefly note why not. (hint: "diffusion" and "heating" are not driving forces for transformation.) Transformation inTransformation will proceed? Source of excess free energy (G) (Driving force) Temp terms of 525°C | Bainite Spheroidite 650°C | Pearlite Austenite

Explanation / Answer

Temp(C ) transformation yes/no driving force 525 Bainite to Spheroidite YES net reduction in ferrite-cementite phase boundary 650 Pearlite to Austenite NO at that temparature the backward transformation i.e. Austenite to Pearilte occurs

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