期刊
MATERIALS SCIENCE AND TECHNOLOGY
卷 26, 期 4, 页码 421-430出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/026708309X12512744154207
关键词
HSLA steels; Isothermal heat treatments; Carbides; Interphase precipitation; High resolution electron microscopy; Orientation relationship transition
资金
- National Science Council, Taiwan [NSC96-2628-E-002-014-MY3]
The objective of the present study was to investigate the crystallography and morphology of TiC particles in a titanium containing high strength low alloy (HSLA) steel that form during isothermal transformation at a temperature in the (alpha + gamma) phase field. The orientation relationships (ORs) were identified from selected area diffraction patterns (SADPs) and from moire fringes in high resolution transmission electron microscopy (HRTEM) lattice images. It was found that in the initial stages of the isothermal transformation, fine plate-like TiC particles develop and that these exhibit the Baker-Nutting (BN) OR with respect to the ferrite matrix. In the later stages of the transformation, however, coarser plate-like carbides are observed, and these adopt approximately the Nishiyama-Wassermann (NW) OR with respect to the ferrite matrix. The evidence indicates that OR transition is brought about simply by aging for a longer time at the transformation temperature, and also manifests a rotation of the precipitate during coarsening.
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