Heterogeneous Chemical State of Carbon in Fe-C Binary Alloys

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