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Title: In situ observation of austenite coarsening induced by massive-like transformation during solidification in Fe–C alloys
Authors: Yasuda, Hideyuki  kyouindb  KAKEN_id  orcid (unconfirmed)
Suga, Takeru
Ichida, Kodai
Narumi, Taka  kyouindb  KAKEN_id  orcid (unconfirmed)
Morishita, Kohei
Author's alias: 安田, 秀幸
菅, 健
鳴海, 大翔
森下, 浩平
Issue Date: 2020
Publisher: IOP Publishing
Journal title: IOP Conference Series: Materials Science and Engineering
Volume: 861
Thesis number: 012051
Abstract: A massive-like transformation, in which δ-ferrite massively transforms to γ-austenite in the solid state, was examined by time-resolved X-ray imaging and X-ray diffractometry on a four-dimensional–computed tomography setup. In the unidirectional solidification of a hyperperitectic steel (0.3 mass% C) at 50 μm/s, δ dendrites, fine γ grains that are produced through the massive-like transformation, and coarse γ grains grow together in the steady state. The massive-like transformation occurred commonly in Fe-based alloys with a peritectic reaction in equilibrium. Time-resolved X-ray diffraction measurements for a peritectic steel (0.18 mass% C) showed that the massive-like transformation induced strains in the γ grains. The fine γ grains coarsened and/or vanished and new γ grains formed. The induced strains were released during coarsening. The results obtained by the observations contribute to building of a physical model for γ grain coarsening.
Description: MCWASP XV: International Conference on Modelling of Casting, Welding and Advanced Solidification Processes 22-23 June 2020, Jönköping, Sweden.
Rights: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
DOI(Published Version): 10.1088/1757-899x/861/1/012051
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