Cascading phase transformations in high carbon steel resulting in the formation of inverse bainite: An atomic scale investigation

Kannan, Rangasayee; Wang, Yiyu; Poplawsky, Jonathan; Babu, Sudarsanam Suresh; Li, Leijun

doi:10.1038/s41598-019-42037-9

Cascading phase transformations in high carbon steel resulting in the formation of inverse bainite: An atomic scale investigation

Journal Article · Wed Apr 03 00:00:00 EDT 2019 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-019-42037-9· OSTI ID:1505310

Kannan, Rangasayee ^[1]; ^[2]; ^[2]; Babu, Sudarsanam Suresh ^[3]; Li, Leijun ^[1]

Univ. of Alberta, Edmonton, AB (Canada)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)

Atom probe tomography (APT) has been implemented to understand the redistribution of solutes during the isothermal cascading phase transformations from supersaturated austenite resulting in the formation of inverse bainite. Different cascading reactions resulting in the formation of inverse bainite, namely the cementite midrib formation, ferrite formation, secondary cementite formation, and the degenerated microstructure of inverse bainite have been studied in detail. Solute profiles across the different transformation interfaces indicate Negligible Partitioning Local Equilibrium (NPLE) type growth kinetics for cementite midrib, whereas a transition in growth kinetics from Para Equilibrium (PE) to Negligible Partitioning Local Equilibrium (NPLE) is observed for secondary cementite and ferrite transformation. The results demonstrate a strong indication that the inverse bainitic transformation occurs as a consequence of individual cascading phase transformations starting from parent austenite, and the transformation of inverse bainite occurs in a similar manner to Widmanstatten ferrite/bainitic ferrite with carbon diffusion-controlled growth, and without any reconstructive or long-range diffusion of substitutional solutes.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1505310

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 9; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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