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Title: 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:
 [1]; ORCiD logo [2]; ORCiD logo [2];  [3];  [1]
  1. Univ. of Alberta, Edmonton, AB (Canada)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). 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. doi: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. doi: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 = {2019},
month = {4}
}

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