Dynamic Transformation of Austenite at Temperatures above the Ae3

John Joseph Jonas; Clodualdo Aranas Jr.; Samuel F. Rodrigues

doi:10.4028/www.scientific.net/MSF.941.633

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HomeMaterials Science ForumMaterials Science Forum Vol. 941Dynamic Transformation of Austenite at...

Dynamic Transformation of Austenite at Temperatures above the Ae₃

Abstract:

Under loading above the Ae₃ temperature, austenite transforms displacively into Widmanstätten ferrite. Here the driving force for transformation is the net softening during the phase change while the obstacle consists of the free energy difference between austenite and ferrite as well as the work of shear accommodation and dilatation during the transformation. Once the driving force is higher than the obstacle, phase transformation occurs. This phenomenon was explored here by means of the optical and electron microscopy of a C-Mn steel deformed above their transformation temperatures. Strain-temperature-transformation (STT) curves are presented that accurately quantify the amount of dynamically formed ferrite; the kinetics of retransformation are also specified in the form of appropriate TTRT diagrams. This technique can be used to improve the models for transformation on accelerated cooling in strip and plate rolling.

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Periodical:

Materials Science Forum (Volume 941)

Pages:

633-638

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.941.633

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Online since:

December 2018

Authors:

John Joseph Jonas*, Clodualdo Aranas Jr., Samuel F. Rodrigues

Keywords:

Dynamic Transformation, STT Curves, TTRT Curves, Widmanstätten Ferrite

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References

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