TY - JOUR
T1 - Evolution of mixed cementite morphologies during non-cooperative eutectoid transformation in Fe-C steels
AU - Ankit, Kumar
AU - Mittnacht, Tobias
AU - Mukherjee, Rajdip
AU - Nestler, Britta
N1 - Funding Information:
KA and BN acknowledge the financial support of DFG in the framework of Graduate School-1483 (Project No. B8). The authors also thank Avisor Bhattacharya for proof-reading.
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/10/1
Y1 - 2015/10/1
N2 - Abstract We numerically investigate the characteristics of concurrent carbon redistribution pathways, as the ferrite-austenite front evolves during an isothermal eutectoid transformation starting from a random distribution of preexisting cementite particle. By analyzing the influence of initial interparticle spacing, arrangement and undercooling (below A1 temperature) on the curvature-driven coarsening, we generalize the present criteria of non-cooperative eutectoid transformation. We also propose plausible mechanisms that result in mixed cementite morphologies (spherical and non-spherical) in the transformed microstructure. For the chosen set of parameters, the present phase-field simulations suggest a strong competition between the cooperative, non-cooperative and coarsening regimes, as the transformation proceeds. The predominance of one or more of the three regimes during the intermittent stages, which depend on the local conditions, determine the cementite size distribution in the transformed microstructure.
AB - Abstract We numerically investigate the characteristics of concurrent carbon redistribution pathways, as the ferrite-austenite front evolves during an isothermal eutectoid transformation starting from a random distribution of preexisting cementite particle. By analyzing the influence of initial interparticle spacing, arrangement and undercooling (below A1 temperature) on the curvature-driven coarsening, we generalize the present criteria of non-cooperative eutectoid transformation. We also propose plausible mechanisms that result in mixed cementite morphologies (spherical and non-spherical) in the transformed microstructure. For the chosen set of parameters, the present phase-field simulations suggest a strong competition between the cooperative, non-cooperative and coarsening regimes, as the transformation proceeds. The predominance of one or more of the three regimes during the intermittent stages, which depend on the local conditions, determine the cementite size distribution in the transformed microstructure.
KW - Coarsening
KW - Divorced eutectoid
KW - Non-cooperative growth
KW - Phase-field method
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U2 - 10.1016/j.commatsci.2015.03.002
DO - 10.1016/j.commatsci.2015.03.002
M3 - Article
AN - SCOPUS:84939262368
SN - 0927-0256
VL - 108
SP - 342
EP - 347
JO - Computational Materials Science
JF - Computational Materials Science
M1 - 6416
ER -