High-Resolution Characterization of Subunits in Nanostructured Bainite in High-Carbon Silicon Steel
Metal Science and Heat Treatment(2024)
Abstract
The microstructure of nanostructured bainite formed by austempering in high-carbon silicon steel is characterized by high resolution electron microscopy. The results show that the bainitic sheaves consist of nanoscale subunits. The found kinds of crystal lattice distortions of each subunit in one bainite lath show clear difference. The latest generated subunit has most distortions. As the subunit grows up, the lattice distortion gradually gets relaxed. This indicates that the subunits form with high phase transformation strain energy, which causes severe lattice distortion. The results provide new experimental evidence on subjects relevant to the understanding of the mechanism of formation of bainitic ferrite.
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Key words
nanostructured bainite,electron microscopy,lattice distortion,microstructure
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