Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Heterogeneous Chemical State of Carbon in Fe-C Binary Alloys
Takayuki Harano Yuki YoshimotoYasuo TakeichiTomohito TanakaEiji OdaShunsuke TaniguchiDaisuke WakabayashiShohei YamashitaReiko MuraoMasao Kimura
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JOURNAL OPEN ACCESS Advance online publication

Article ID: TETSU-2023-028


In this study, we performed scanning transmission X-ray microscopy with a spatial resolution of approximately 50 nm to investigate the two-dimensional mapping of the chemical states of carbon in Fe–C alloy. The lamellar texture (pearlite) consisting of ferrite (α-Fe) and θ-Fe3C with an interval of approximately 100 nm was identified by absorption from the carbon 1s→2p excitation in the X-ray absorption image. It was clearly observed that there exist more than two types of chemical states of carbon in θ-Fe3C depending on the microtextures. The differences in chemical states were found between grained θ-Fe3C and lamellar θ-Fe3C in pearlite, which might have originated from the texture and morphology of the θ-Fe3C. To consider the origins of the differences, we performed first-principles calculations by assuming the distortion and crystal anisotropy of the unit cell of the θ-Fe3C structure. The results suggest that the anisotropy of the crystal structure of θ-Fe3C and the lattice strain within lamellar θ-Fe3C fail to explain the differences, and therefore, other factors should be considered.

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© 2023 The Iron and Steel Institute of Japan

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