In situ observation of austenite coarsening induced by massive-like transformation during solidification in Fe-C alloys

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...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2020-05, Vol.861 (1), p.12051
Main Authors: Yasuda, H, Suga, T, Ichida, K, Narumi, T, Morishita, K
Format: Article
Language:English
Subjects:
Austenite
Coarsening
Computed tomography
Delta ferrite
Ferrous alloys
Solidification
Transformations
X ray imagery
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Summary: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.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/861/1/012051