Identification of Ti-S-C-containing Multi-phase Precipitates in Ultra-low Carbon Steels by Analytical Electron Microscopy.

  • Hua M.
    Basic Metals Processing Research Institute, Department of Materials Science and Engineering, University of Pittsburgh
  • Garcia C. I.
    Basic Metals Processing Research Institute, Department of Materials Science and Engineering, University of Pittsburgh
  • Eloot K.
    On leave from University of Gent
  • DeArdo A. J.
    Basic Metals Processing Research Institute, Department of Materials Science and Engineering, University of Pittsburgh

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The Ti-, S-, and C-containing particles in ultra-low carbon (ULC) interstitial free steels are frequently multi-phase in nature, consisting of TiS (9R) and Ti4C2S2(H), and, therefore, show an irrational Ti/S ratio as detected by an X-ray energy dispersive spectrum (EDS). This paper confirmed the existence of multi-phase precipitates in ULC steels by analytical electron microscopy. It is shown that an accurate description of 9R-H two-phase composite particles can only be achieved when particles are at some special orientations.

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