Stacking fault aggregation during cooling composing FCC–HCP martensitic transformation revealed by in-situ electron channeling contrast imaging in an Fe-high Mn alloy

Motomichi Koyama; Misaki Seo; Keiichiro Nakafuji; Kaneaki Tsuzaki

doi:10.1080/14686996.2021.1877570

Stacking fault aggregation during cooling composing FCC–HCP martensitic transformation revealed by in-situ electron channeling contrast imaging in an Fe-high Mn alloy

Motomichi Koyama, Misaki Seo, Keiichiro Nakafuji, Kaneaki Tsuzaki

IMR - Materials Design Division

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

To understand the mechanism of FCC–HCP martensitic transformation, we applied electron channeling contrast imaging under cooling to −51°C and subsequent heating to 150°C. The stacking faults were randomly extended and aggregated during cooling. The stacking fault aggregates were indexed as HCP. Furthermore, the shrink of stacking faults due to reverse motion of Shockley partials was observed during heating, but some SFs remained even after heating to the finishing temperature for reverse transformation (A_f: 104°C). This fact implies that the chemical driving force of the FCC/HCP phases does not contribute to the motion of a single SF but works for group motion of stacking faults.

Original language	English
Pages (from-to)	135-140
Number of pages	6
Journal	Science and Technology of Advanced Materials
Volume	22
Issue number	1
DOIs	https://doi.org/10.1080/14686996.2021.1877570
Publication status	Published - 2021

Keywords

austenitic steel
electron channeling contrast imaging
in situ electron microscopy
martensitic transformation
Metallic materials
SEM
Stacking fault
STEM
TEM

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10.1080/14686996.2021.1877570

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title = "Stacking fault aggregation during cooling composing FCC–HCP martensitic transformation revealed by in-situ electron channeling contrast imaging in an Fe-high Mn alloy",

abstract = "To understand the mechanism of FCC–HCP martensitic transformation, we applied electron channeling contrast imaging under cooling to −51°C and subsequent heating to 150°C. The stacking faults were randomly extended and aggregated during cooling. The stacking fault aggregates were indexed as HCP. Furthermore, the shrink of stacking faults due to reverse motion of Shockley partials was observed during heating, but some SFs remained even after heating to the finishing temperature for reverse transformation (Af: 104°C). This fact implies that the chemical driving force of the FCC/HCP phases does not contribute to the motion of a single SF but works for group motion of stacking faults.",

keywords = "austenitic steel, electron channeling contrast imaging, in situ electron microscopy, martensitic transformation, Metallic materials, SEM, Stacking fault, STEM, TEM",

author = "Motomichi Koyama and Misaki Seo and Keiichiro Nakafuji and Kaneaki Tsuzaki",

note = "Funding Information: This work was supported financially by JSPS KAKENHI (JP16H06365 and JP20H02457) and Elements Strategy Initiative for Structural Materials (ESISM) of Ministry of Education, Culture, Sports, Science and Technology (MEXT) Japan (JPMXP0112101000). Publisher Copyright: {\textcopyright} 2021 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.",

year = "2021",

doi = "10.1080/14686996.2021.1877570",

language = "English",

volume = "22",

pages = "135--140",

journal = "Science and Technology of Advanced Materials",

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Stacking fault aggregation during cooling composing FCC–HCP martensitic transformation revealed by in-situ electron channeling contrast imaging in an Fe-high Mn alloy. / Koyama, Motomichi; Seo, Misaki; Nakafuji, Keiichiro et al.
In: Science and Technology of Advanced Materials, Vol. 22, No. 1, 2021, p. 135-140.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Stacking fault aggregation during cooling composing FCC–HCP martensitic transformation revealed by in-situ electron channeling contrast imaging in an Fe-high Mn alloy

AU - Koyama, Motomichi

AU - Seo, Misaki

AU - Nakafuji, Keiichiro

AU - Tsuzaki, Kaneaki

N1 - Funding Information: This work was supported financially by JSPS KAKENHI (JP16H06365 and JP20H02457) and Elements Strategy Initiative for Structural Materials (ESISM) of Ministry of Education, Culture, Sports, Science and Technology (MEXT) Japan (JPMXP0112101000). Publisher Copyright: © 2021 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.

PY - 2021

Y1 - 2021

N2 - To understand the mechanism of FCC–HCP martensitic transformation, we applied electron channeling contrast imaging under cooling to −51°C and subsequent heating to 150°C. The stacking faults were randomly extended and aggregated during cooling. The stacking fault aggregates were indexed as HCP. Furthermore, the shrink of stacking faults due to reverse motion of Shockley partials was observed during heating, but some SFs remained even after heating to the finishing temperature for reverse transformation (Af: 104°C). This fact implies that the chemical driving force of the FCC/HCP phases does not contribute to the motion of a single SF but works for group motion of stacking faults.

AB - To understand the mechanism of FCC–HCP martensitic transformation, we applied electron channeling contrast imaging under cooling to −51°C and subsequent heating to 150°C. The stacking faults were randomly extended and aggregated during cooling. The stacking fault aggregates were indexed as HCP. Furthermore, the shrink of stacking faults due to reverse motion of Shockley partials was observed during heating, but some SFs remained even after heating to the finishing temperature for reverse transformation (Af: 104°C). This fact implies that the chemical driving force of the FCC/HCP phases does not contribute to the motion of a single SF but works for group motion of stacking faults.

KW - austenitic steel

KW - electron channeling contrast imaging

KW - in situ electron microscopy

KW - martensitic transformation

KW - Metallic materials

KW - SEM

KW - Stacking fault

KW - STEM

KW - TEM

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Stacking fault aggregation during cooling composing FCC–HCP martensitic transformation revealed by in-situ electron channeling contrast imaging in an Fe-high Mn alloy

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Keywords

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