TY - JOUR
T1 - Transformation from ferrite to austenite during/after solidification in peritectic steel systems
T2 - An x-ray imaging study
AU - YASUDA, Hideyuki
AU - MORISHITA, Kohei
AU - YOSHIYA, Masato
AU - NARUMI, Taka
N1 - Funding Information:
BL20B2 and BL20XU of SPring-8 (JASRI), Japan. The authors express our thanks to valuable discussions in a research group “Visualization of Solidification” of the 19th Committee on Steelmaking of JSPS in the initial stage of “massive-like transformation” research. The authors also acknowledge financial support from Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials of the Industry–Academia Collaborative R&D Program (JST) and a Grant-in-Aid for Scientific Research (S) (No. 17H06155) for observing solidification phenomena at SPring-8. The authors thank graduate students, who contributed to the studies, at Osaka University and Kyoto University. We thank Laura Kuhar, PhD, from Edanz Group (https://en-author-services.edanzgroup.com/ ac) for editing a draft of this manuscript.
Publisher Copyright:
© 2020 The Iron and Steel Institute of Japan.
PY - 2020/12/15
Y1 - 2020/12/15
N2 - X-ray transmission imaging with X-ray diffractometry and time-resolved tomography with three-dimensional X-ray diffraction microscopy have been used to observe solidification and transformation in carbon steel and other Fe-based alloys. The imaging techniques showed a massive-like transformation, in which multiple austenite grains were produced in a single δ grain through a solid-solid transformation. The critical velocity from the diffusion-controlled growth of the γ phase to the massive-like transformation was as low as 5 μm/s. X-ray imaging indicated that the δ phase transforms massively to the γ phase in the conventional solidification processes, such as continuous casting. The massive-like transformation and multiple γ grains that were produced in the transformation were related to the subsequent microstructure evolution and casting defect formation. Solidification model including the massive-like transformation is expected to improve our understanding the solidification and the related phenomena in the peritectic steel systems.
AB - X-ray transmission imaging with X-ray diffractometry and time-resolved tomography with three-dimensional X-ray diffraction microscopy have been used to observe solidification and transformation in carbon steel and other Fe-based alloys. The imaging techniques showed a massive-like transformation, in which multiple austenite grains were produced in a single δ grain through a solid-solid transformation. The critical velocity from the diffusion-controlled growth of the γ phase to the massive-like transformation was as low as 5 μm/s. X-ray imaging indicated that the δ phase transforms massively to the γ phase in the conventional solidification processes, such as continuous casting. The massive-like transformation and multiple γ grains that were produced in the transformation were related to the subsequent microstructure evolution and casting defect formation. Solidification model including the massive-like transformation is expected to improve our understanding the solidification and the related phenomena in the peritectic steel systems.
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U2 - 10.2355/isijinternational.ISIJINT-2020-486
DO - 10.2355/isijinternational.ISIJINT-2020-486
M3 - Review article
AN - SCOPUS:85098108406
SN - 0915-1559
VL - 60
SP - 2755
EP - 2764
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
IS - 12
ER -