"' Isothermal transformation "'( IT ) diagram or the C-curve is associated with mechanical properties, microconstituents / microstructures, and heat treatments in carbon steels.
3.
An isothermal transformation diagram is only valid for one specific composition of material, and only if the temperature is held constant during the transformation, and strictly with rapid cooling to that temperature.
4.
"' Isothermal transformation diagrams "'( also known as time-temperature-transformation ( TTT ) diagrams ) are plots of temperature versus time ( usually on a logarithmic scale ).
5.
The efficacy of inclusions as nucleation sites in modern low alloy steel weld metals is such that fine-scale intragranular bainite can nucleate on them, both by continuous cooling and by isothermal transformation below the bainite start temperature.
6.
Further research into the isothermal transformation of steels was a result of Bain and Davenport's discovery of a new microstructure consisting of an " acicular, dark etching aggregate . " This microstructure was found to be " tougher for the same hardness than tempered Martensite ".
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