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Title: Microstructural evolution during quenching and partitioning of 0.2C-1.5Mn-1.3Si steels with Cr or Ni additions

Abstract

Here, the influence of Cr and Ni additions and quench and partition (Q&P) processing parameters on the microstructural development, including carbide formation and austenite retention during Q&P, was studied in two steels with a base composition of 0.2C-1.5Mn-1.3Si wt.% and additions of 1.5 wt.% Cr (1.5Cr) or Ni (1.5Ni). Additions of 1.5 wt.% Cr significantly slowed the kinetics of austenite decomposition relative to the 1.5Ni alloy at all partitioning temperatures, promoting greater austenite retention, lower retained austenite carbon (C) contents, and reduced sensitivity of the retained austenite amounts to processing variables. In the 1.5Cr alloy after partitioning at 400 °C for 300 s, η-carbides were identified by transmission electron microscopy (TEM) and atom probe tomography (APT) revealed no significant enrichment of substitutional elements in the carbides. In the 1.5Ni alloy after partitioning at 450 °C for 300 s, both plate-like and globular carbides were observed by TEM. APT analysis of the globular carbides clearly revealed significant Si rejection and Mn enrichment. Mössbauer effect spectroscopy was used to quantify the amount of carbides after Q&P. In general, carbide amounts below ~0.3% of Fe were measured in both alloys after partitioning for short times (10 s), irrespective of quench or partitioning temperature,more » which corresponds to a relatively small portion of the bulk C. With increasing partitioning time, carbide amounts remained approximately constant or increased, depending on the alloy, quench temperature, and/or partitioning temperature.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [5];  [4];  [6];  [4];  [4];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Colorado School of Mines, Golden, CO (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Colorado School of Mines, Golden, CO (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Colorado School of Mines, Golden, CO (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. at Buffalo, Buffalo, NY (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1435324
Alternate Identifier(s):
OSTI ID: 1548596
Grant/Contract Number:  
AC05-00OR22725; EE0005765; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 151; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Quenching and partitioning; Mössbauer spectroscopy; Carbide; Retained austenite; Atom probe tomography

Citation Formats

Pierce, Dean T., Coughlin, D. R., Clarke, Kester D., De Moor, Emmanuel, Poplawsky, Jonathan D., Williamson, Don L., Mazumder, Baishakhi, Speer, J. G., Hood, Andrew, and Clarke, A. J. Microstructural evolution during quenching and partitioning of 0.2C-1.5Mn-1.3Si steels with Cr or Ni additions. United States: N. p., 2018. Web. doi:10.1016/j.actamat.2018.03.007.
Pierce, Dean T., Coughlin, D. R., Clarke, Kester D., De Moor, Emmanuel, Poplawsky, Jonathan D., Williamson, Don L., Mazumder, Baishakhi, Speer, J. G., Hood, Andrew, & Clarke, A. J. Microstructural evolution during quenching and partitioning of 0.2C-1.5Mn-1.3Si steels with Cr or Ni additions. United States. https://doi.org/10.1016/j.actamat.2018.03.007
Pierce, Dean T., Coughlin, D. R., Clarke, Kester D., De Moor, Emmanuel, Poplawsky, Jonathan D., Williamson, Don L., Mazumder, Baishakhi, Speer, J. G., Hood, Andrew, and Clarke, A. J. Thu . "Microstructural evolution during quenching and partitioning of 0.2C-1.5Mn-1.3Si steels with Cr or Ni additions". United States. https://doi.org/10.1016/j.actamat.2018.03.007. https://www.osti.gov/servlets/purl/1435324.
@article{osti_1435324,
title = {Microstructural evolution during quenching and partitioning of 0.2C-1.5Mn-1.3Si steels with Cr or Ni additions},
author = {Pierce, Dean T. and Coughlin, D. R. and Clarke, Kester D. and De Moor, Emmanuel and Poplawsky, Jonathan D. and Williamson, Don L. and Mazumder, Baishakhi and Speer, J. G. and Hood, Andrew and Clarke, A. J.},
abstractNote = {Here, the influence of Cr and Ni additions and quench and partition (Q&P) processing parameters on the microstructural development, including carbide formation and austenite retention during Q&P, was studied in two steels with a base composition of 0.2C-1.5Mn-1.3Si wt.% and additions of 1.5 wt.% Cr (1.5Cr) or Ni (1.5Ni). Additions of 1.5 wt.% Cr significantly slowed the kinetics of austenite decomposition relative to the 1.5Ni alloy at all partitioning temperatures, promoting greater austenite retention, lower retained austenite carbon (C) contents, and reduced sensitivity of the retained austenite amounts to processing variables. In the 1.5Cr alloy after partitioning at 400 °C for 300 s, η-carbides were identified by transmission electron microscopy (TEM) and atom probe tomography (APT) revealed no significant enrichment of substitutional elements in the carbides. In the 1.5Ni alloy after partitioning at 450 °C for 300 s, both plate-like and globular carbides were observed by TEM. APT analysis of the globular carbides clearly revealed significant Si rejection and Mn enrichment. Mössbauer effect spectroscopy was used to quantify the amount of carbides after Q&P. In general, carbide amounts below ~0.3% of Fe were measured in both alloys after partitioning for short times (10 s), irrespective of quench or partitioning temperature, which corresponds to a relatively small portion of the bulk C. With increasing partitioning time, carbide amounts remained approximately constant or increased, depending on the alloy, quench temperature, and/or partitioning temperature.},
doi = {10.1016/j.actamat.2018.03.007},
journal = {Acta Materialia},
number = C,
volume = 151,
place = {United States},
year = {Thu Mar 08 00:00:00 EST 2018},
month = {Thu Mar 08 00:00:00 EST 2018}
}

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Cited by: 49 works
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Works referencing / citing this record:

Microstructure Evolution and Competitive Reactions during Quenching and Partitioning of a Model Fe–C–Mn–Si Alloy
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Optimization of Quenching Temperature to Minimize the Micro Segregation Induced Banding Phenomena in Quenching and Partitioning (Q&P) Steels
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Microstructure Evolution and Competitive Reactions during Quenching and Partitioning of a Model Fe–C–Mn–Si Alloy
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In Situ Investigation of the Iron Carbide Precipitation Process in a Fe-C-Mn-Si Q&P Steel
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