Cascading phase transformations in high carbon steel resulting in the formation of inverse bainite: An atomic scale investigation
Abstract
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.
- Authors:
-
- Univ. of Alberta, Edmonton, AB (Canada)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- OSTI Identifier:
- 1505310
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Kannan, Rangasayee, Wang, Yiyu, Poplawsky, Jonathan, Babu, Sudarsanam Suresh, and Li, Leijun. Cascading phase transformations in high carbon steel resulting in the formation of inverse bainite: An atomic scale investigation. United States: N. p., 2019.
Web. doi:10.1038/s41598-019-42037-9.
Kannan, Rangasayee, Wang, Yiyu, Poplawsky, Jonathan, Babu, Sudarsanam Suresh, & Li, Leijun. Cascading phase transformations in high carbon steel resulting in the formation of inverse bainite: An atomic scale investigation. United States. https://doi.org/10.1038/s41598-019-42037-9
Kannan, Rangasayee, Wang, Yiyu, Poplawsky, Jonathan, Babu, Sudarsanam Suresh, and Li, Leijun. Wed .
"Cascading phase transformations in high carbon steel resulting in the formation of inverse bainite: An atomic scale investigation". United States. https://doi.org/10.1038/s41598-019-42037-9. https://www.osti.gov/servlets/purl/1505310.
@article{osti_1505310,
title = {Cascading phase transformations in high carbon steel resulting in the formation of inverse bainite: An atomic scale investigation},
author = {Kannan, Rangasayee and Wang, Yiyu and Poplawsky, Jonathan and Babu, Sudarsanam Suresh and Li, Leijun},
abstractNote = {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.},
doi = {10.1038/s41598-019-42037-9},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United States},
year = {Wed Apr 03 00:00:00 EDT 2019},
month = {Wed Apr 03 00:00:00 EDT 2019}
}
Web of Science
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