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

D. T. Pierce; D. R. Coughlin; K. D. Clarke; E. De Moor; J. Poplawsky; D. L. Williamson; B. Mazumder; J. G. Speer; A. Hood; A. J. Clarke

doi:10.1016/j.actamat.2018.03.007

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

D. T. Pierce, D. R. Coughlin, K. D. Clarke, E. De Moor, J. Poplawsky, D. L. Williamson, B. Mazumder, J. G. Speer, A. Hood, A. J. Clarke

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Abstract

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.

Original language	English
Pages (from-to)	454-469
Number of pages	16
Journal	Acta Materialia
Volume	151
DOIs	https://doi.org/10.1016/j.actamat.2018.03.007
State	Published - Jun 1 2018

Funding

This work was supported by the U.S. Department of Energy under Award Number DE-EE0005765 . DTP, DLW, JGS, and EDM gratefully acknowledge support from the sponsors of the Advanced Steel Processing and Products Research Center (ASPPRC) , an industry/university cooperative research center. DRC, KDC, and AJC gratefully acknowledge support from Los Alamos National Laboratory , operated by Los Alamos National Security , LLC under Contract No. DE-AC52-06NA25396 for the U.S. Department of Energy . APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. Appendix A This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. This work was supported by the U.S. Department of Energy under Award Number DE-EE0005765. DTP, DLW, JGS, and EDM gratefully acknowledge support from the sponsors of the Advanced Steel Processing and Products Research Center (ASPPRC), an industry/university cooperative research center. DRC, KDC, and AJC gratefully acknowledge support from Los Alamos National Laboratory, operated by Los Alamos National Security, LLC under Contract No. DE-AC52-06NA25396 for the U.S. Department of Energy. APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility.

Funders	Funder number
Advanced Steel Processing and Products Research Center
KDC
Los Alamos National Security , LLC
United States Government
U.S. Department of Energy	DE-EE0005765
Diabetes Research Center
Los Alamos National Laboratory	DE-AC52-06NA25396

Keywords

Atom probe tomography
Carbide
Mössbauer spectroscopy
Quenching and partitioning
Retained austenite

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10.1016/j.actamat.2018.03.007

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@article{9fa9e946b2c94155885b56ac7012eeb5,

title = "Microstructural evolution during quenching and partitioning of 0.2C-1.5Mn-1.3Si steels with Cr or Ni additions",

abstract = "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. M{\"o}ssbauer 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.",

keywords = "Atom probe tomography, Carbide, M{\"o}ssbauer spectroscopy, Quenching and partitioning, Retained austenite",

author = "Pierce, {D. T.} and Coughlin, {D. R.} and Clarke, {K. D.} and {De Moor}, E. and J. Poplawsky and Williamson, {D. L.} and B. Mazumder and Speer, {J. G.} and A. Hood and Clarke, {A. J.}",

note = "Publisher Copyright: {\textcopyright} 2018 Acta Materialia Inc.",

year = "2018",

month = jun,

day = "1",

doi = "10.1016/j.actamat.2018.03.007",

language = "English",

volume = "151",

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journal = "Acta Materialia",

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TY - JOUR

T1 - Microstructural evolution during quenching and partitioning of 0.2C-1.5Mn-1.3Si steels with Cr or Ni additions

AU - Pierce, D. T.

AU - Coughlin, D. R.

AU - Clarke, K. D.

AU - De Moor, E.

AU - Poplawsky, J.

AU - Williamson, D. L.

AU - Mazumder, B.

AU - Speer, J. G.

AU - Hood, A.

AU - Clarke, A. J.

PY - 2018/6/1

Y1 - 2018/6/1

N2 - 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.

AB - 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.

KW - Atom probe tomography

KW - Carbide

KW - Mössbauer spectroscopy

KW - Quenching and partitioning

KW - Retained austenite

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DO - 10.1016/j.actamat.2018.03.007

M3 - Article

AN - SCOPUS:85045711448

SN - 1359-6454

VL - 151

SP - 454

EP - 469

JO - Acta Materialia

JF - Acta Materialia

ER -

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

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