TY - JOUR
T1 - Isothermal Phase Transformations in a Low Carbon Steel During Single and Two-Step Partitioning
AU - Castro Cerda, F. M.
AU - Hernández, E. I.
AU - Ros-Yanez, T.
AU - Petrov, R. H.
N1 - + Correction: Metallurgical and Materials Transactions A, Volume 51A, April 2020
https://doi.org/10.1007/s11661-021-06201-z
PY - 2020
Y1 - 2020
N2 - Single and two-step heat treatments were performed on hot-rolled 0.2C-2Mn-1.4Si-0.3Mo steel. The microstructure was characterized by means of optical and scanning electron microscopy and X-ray diffraction measurements. The results showed that the main microstructural components are tempered martensite, bainite, and retained austenite. The thermodynamic analysis showed that the constrained carbon equilibrium in the presence of cementite CCEθ model fits the experimental data for the isothermal heat treatment at a temperature well below the MS. Neither of the existing models for predicting the equilibrium between martensite and austenite (i.e., constrained carbon equilibrium CCE and CCEθ) seems to predict the measured austenitic carbon content nearby the MS, which might indicate that local equilibrium (LE) conditions during bainitic transformation govern the final stage of both single and two-phase heat treatments.
AB - Single and two-step heat treatments were performed on hot-rolled 0.2C-2Mn-1.4Si-0.3Mo steel. The microstructure was characterized by means of optical and scanning electron microscopy and X-ray diffraction measurements. The results showed that the main microstructural components are tempered martensite, bainite, and retained austenite. The thermodynamic analysis showed that the constrained carbon equilibrium in the presence of cementite CCEθ model fits the experimental data for the isothermal heat treatment at a temperature well below the MS. Neither of the existing models for predicting the equilibrium between martensite and austenite (i.e., constrained carbon equilibrium CCE and CCEθ) seems to predict the measured austenitic carbon content nearby the MS, which might indicate that local equilibrium (LE) conditions during bainitic transformation govern the final stage of both single and two-phase heat treatments.
UR - http://www.scopus.com/inward/record.url?scp=85078999206&partnerID=8YFLogxK
U2 - 10.1007/s11661-020-05643-1
DO - 10.1007/s11661-020-05643-1
M3 - Article
AN - SCOPUS:85078999206
SN - 1073-5623
VL - 51
SP - 1506
EP - 1518
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 4
ER -