TY - JOUR
T1 - Split and shift of -martensite peak in an X-ray diffraction profile during hydrogen desorption
T2 - A geometric effect of atomic sequence
AU - Koyama, Motomichi
AU - Abe, Yuji
AU - Tsuzaki, Kaneaki
N1 - Funding Information:
The Materials Manufacturing and Engineering Station at the National Institute for Materials Science supported this work through the production of the samples. M. Koyama and K. Tsuzaki acknowledge the helpful discussion with Dr. Sawaguchi. The research project was supported by the Japan Science and Technology Agency (JST) (grant number: 20100113) under Industry-Academia Collaborative R&D Program “Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials” and JSPS KAKENHI (JP16H06365; JP17H04956). Y. Abe thanks Ms Yuriko Hirota in NIMS for her kind assistance of hydrogen-charging and hydrogen content measurement experiments.
Publisher Copyright:
© 2018 Iron and Steel Institute of Japan. All rights reserved.
PY - 2018/9/15
Y1 - 2018/9/15
N2 - Cryogenic X-ray diffraction measurements demonstrated a split of the -martensite peak at 193 K in a hydrogen-charged austenitic steel. Only the higher angle peak remained after aging at room temperature. This phenomenon can be interpreted by a change in the interstitial hydrogen position. Particularly, the motion of the leading partial involved in -martensitic transformation can move interstitial hydrogen from a tetrahedron to an octahedron site, expanding the lattice. Subsequently, the hydrogen can move back to the tetrahedron site, which relatively shrinks the lattice. The two different hydrogen positions cause the peak to split.
AB - Cryogenic X-ray diffraction measurements demonstrated a split of the -martensite peak at 193 K in a hydrogen-charged austenitic steel. Only the higher angle peak remained after aging at room temperature. This phenomenon can be interpreted by a change in the interstitial hydrogen position. Particularly, the motion of the leading partial involved in -martensitic transformation can move interstitial hydrogen from a tetrahedron to an octahedron site, expanding the lattice. Subsequently, the hydrogen can move back to the tetrahedron site, which relatively shrinks the lattice. The two different hydrogen positions cause the peak to split.
KW - Austenitic steel
KW - Hydrogen
KW - Lattice dilatation
KW - Martensitic transformation
KW - X-ray diffraction
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U2 - 10.2355/isijinternational.ISIJINT-2018-260
DO - 10.2355/isijinternational.ISIJINT-2018-260
M3 - Article
AN - SCOPUS:85053508250
SN - 0915-1559
VL - 58
SP - 1745
EP - 1747
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
IS - 9
ER -