High-resolution transmission electron microscopy study of crystallography and morphology of TiC precipitates in tempered steel

Fu Gao Wei, Toru Hara, Kaneaki Tsuzaki

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In spite of the significance of NaCl-type transition-metal carbides in steels, their crystallography and morphology have not been understood on an atomic scale. High-resolution electron microscopy was employed in the present work to examine the crystallography and morphology of TiC particles that precipitated in the quenched and tempered 0.05wt%C-0.20wt%Ti-2.0wt%Ni steel. Plate-like TiC precipitates with a thickness ranging from a couple of atomic layers to 20 nm were observed in steels by tempering at 550, 600 and 800°C. It was found that the Baker-Nutting orientation relationship is always satisfied with the ferrite matrix within about 5° for both the nanosized and the coarse TiC particles. The habit plane of the TiC precipitate is the (100) ferrite plane. A moderate tendency for the faceting of lateral interfaces on the {001} and {011} ferrite planes was found. The presence of interfacial misfit dislocations was revealed by examining the excess lattice fringes terminating at the interfaces between the TiC platelet and the ferrite matrix. The location and number of the excess lattice fringes terminating at the broad plane and the lateral interface were consistent with the mismatch in the atomic arrangement between the Baker-Nutting orientation relationship related TiC and ferrite.

Original languageEnglish
Pages (from-to)1735-1751
Number of pages17
JournalPhilosophical Magazine
Issue number17
Publication statusPublished - Jun 11 2004
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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