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CHE 333 Class 9

Non equilibrium conditions. Non equilibrium is when a reaction is not allowed to go to completion. An example is

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CHE 333 Class 9

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    1. CHE 333 Class 9 Non Equilibrium Heat Treatment of Steels.

    2. Non equilibrium conditions Non equilibrium is when a reaction is not allowed to go to completion. An example is “quenching” when a hot object is plunged into a bath of cool liquid, such as iced brine or oil. Under these conditions an expected phase change will be suppressed, that is, it will not happen. Several results are possible. The high temperature phase is retained at low temperature – age hardening. A new phase is produced that is not predicted by the phase diagram. If the new phase is stable at room temperature it is termed a “Metastable” phase. Example of metastable phase formation by non equilibrium heat treatment is the formation of “Martensite” in steels.

    3. Martensite Formation.

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