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- Isothermal_transformation_diagram abstract "Isothermal transformation diagrams (also known as time-temperature-transformation (TTT) diagrams) are plots of temperature versus time (usually on a logarithmic scale). They are generated from percentage transformation-vs logarithm of time measurements, and are useful for understanding the transformations of an alloy steel that is cooled isothermally. 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. Though usually used to represent transformation kinetics for steels, they also can be used to describe the kinetics of crystallization in ceramic or other materials. Time-temperature-precipitation diagrams and time-temperature-embrittlement diagrams have also been used to represent kinetic changes in steels.Isothermal transformation (IT) diagram or the C-curve is associated with mechanical properties, microconstituents/microstructures, and heat treatments in carbon steels. Diffusional transformations like austenite transforming to a cementite and ferrite mixture can be explained using the sigmoidal curve; For example the beginning of pearlitic transformation is represented by the pearlite start (Ps) curve. This transformation is complete at Pf curve. Nucleation requires an incubation time. The rate of nucleation increases and the rate of microconstituent growth decreases as the temperature decreases from the liquidus temperature reaching a maximum at the bay or nose of the curve. Thereafter, the decrease in diffusion rate due to low temperature offsets the effect of increased driving force due to greater difference in free energy. As a result of the transformation, the microconstituents, Pearlite and Bainite, form; Pearlite forms at higher temperatures and bainite at lower.Austenite is slightly undercooled when quenched below Eutectoid temperature. When given more time, stable microconstituents can form: ferrite and cementite. Coarse pearlite is produced when atoms diffuse rapidly after phases that form pearlite nucleate. This transformation is complete at the pearlite finish time (Pf).However, greater undercooling by rapid quenching results in formation of martensite or bainite instead of pearlite. This is possible provided the cooling rate is such that the cooling curve intersects the martensite start temperature or the bainite start curve before intersecting the Ps curve. The martensite transformation being a diffusionless shear transformation is represented by a straight line to signify the martensite start temperature.".
- Isothermal_transformation_diagram thumbnail T-T-T-diagram.svg?width=300.
- Isothermal_transformation_diagram wikiPageExternalLink what-is-pearlite.htm.
- Isothermal_transformation_diagram wikiPageID "10977382".
- Isothermal_transformation_diagram wikiPageRevisionID "604507718".
- Isothermal_transformation_diagram hasPhotoCollection Isothermal_transformation_diagram.
- Isothermal_transformation_diagram subject Category:Diagrams.
- Isothermal_transformation_diagram subject Category:Metallurgy.
- Isothermal_transformation_diagram subject Category:Phase_transitions.
- Isothermal_transformation_diagram type Artifact100021939.
- Isothermal_transformation_diagram type Creation103129123.
- Isothermal_transformation_diagram type Diagram103186399.
- Isothermal_transformation_diagram type Diagrams.
- Isothermal_transformation_diagram type Drawing103234306.
- Isothermal_transformation_diagram type Object100002684.
- Isothermal_transformation_diagram type PhysicalEntity100001930.
- Isothermal_transformation_diagram type Representation104076846.
- Isothermal_transformation_diagram type Whole100003553.
- Isothermal_transformation_diagram comment "Isothermal transformation diagrams (also known as time-temperature-transformation (TTT) diagrams) are plots of temperature versus time (usually on a logarithmic scale). They are generated from percentage transformation-vs logarithm of time measurements, and are useful for understanding the transformations of an alloy steel that is cooled isothermally.".
- Isothermal_transformation_diagram label "Curva di Bain".
- Isothermal_transformation_diagram label "Diagrama TTT".
- Isothermal_transformation_diagram label "Diagramme temps-température-transformation".
- Isothermal_transformation_diagram label "Isothermal transformation diagram".
- Isothermal_transformation_diagram label "TTT-diagram".
- Isothermal_transformation_diagram label "TTT図".
- Isothermal_transformation_diagram label "Wykres CTP".
- Isothermal_transformation_diagram label "Zeit-Temperatur-Umwandlungsschaubild".
- Isothermal_transformation_diagram sameAs TTT_diagram.
- Isothermal_transformation_diagram sameAs Zeit-Temperatur-Umwandlungsschaubild.
- Isothermal_transformation_diagram sameAs Diagrama_TTT.
- Isothermal_transformation_diagram sameAs Diagramme_temps-température-transformation.
- Isothermal_transformation_diagram sameAs Curva_di_Bain.
- Isothermal_transformation_diagram sameAs TTT図.
- Isothermal_transformation_diagram sameAs TTT-diagram.
- Isothermal_transformation_diagram sameAs Wykres_CTP.
- Isothermal_transformation_diagram sameAs m.02qwz7_.
- Isothermal_transformation_diagram sameAs Q185011.
- Isothermal_transformation_diagram sameAs Q185011.
- Isothermal_transformation_diagram sameAs Isothermal_transformation_diagram.
- Isothermal_transformation_diagram wasDerivedFrom Isothermal_transformation_diagram?oldid=604507718.
- Isothermal_transformation_diagram depiction T-T-T-diagram.svg.
- Isothermal_transformation_diagram isPrimaryTopicOf Isothermal_transformation_diagram.