3. Heating conversions
Heating transformations can be studied from two different angles, depending on the initial structural state and the objective:
the steel is in one of the structural states (more or less out of equilibrium) resulting from the different conditions under which the γ → α transformation may have taken place, and we wish, by reheating, to bring about a limited and controlled return to the equilibrium state at ambient temperature (and above all to bring about hardening precipitation); this point will be dealt with in the paragraph "tempering out-of-equilibrium structures";
the steel is in a state more or less approaching equilibrium, and reheating is intended to bring it to the austenitic state, as part of its processing; this point will be dealt with in the "α → γ transformations"...
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Heating conversions
Standardization
French Standards Association (AFNOR)
- Valeurs de convention dureté-résistance à la traction de l'acier - NF A 03-173 - 11-84
- Essai de trempabilité Jominy - NF A 04-303 - 06-79
Bibliography
Micrographs
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