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Time‐Temperature‐Reverse Transformation (TTRT) Behaviors of a C‐Mn and a Nb Microalloyed Steel after Dynamic Transformation above the A e 3
Author(s) -
Aranas Clodualdo,
Rodrigues Samuel F.,
Shen YuJack,
Zhang Zhe,
Jonas John J.
Publication year - 2017
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201700006
Subject(s) - materials science , transformation (genetics) , metallurgy , microalloyed steel , manganese , microstructure , austenite , chemistry , biochemistry , gene
The dynamic transformation (DT) of austenite to ferrite and the retransformation of the dynamically transformed ferrite back into the more stable austenite were studied at temperatures above the A e 3 . For this purpose, compression tests were carried out on a C‐Mn and a Nb microalloyed steel over the temperature range 870–960 °C. The samples were deformed to a strain of 0.75 at a strain rate of 1 s −1 and held isothermally for times of 1–1000 s to permit retransformation. The samples were water quenched after testing and the volume fractions of retransformed ferrite were measured to allow for the construction of TTRT (time–temperature–reverse transformation) curves. The present type of diagram can be combined with strain–temperature–transformation (STT) curves to model the occurrence of dynamic transformation and retransformation during thermomechanical processing.