Microstructure and Precipitation Behavior of Nb, Ti Complex Microalloyed Steel Produced by Compact Strip Processing

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著者

    • WANG Ruizhen
    • Institute for Structural Materials, Central Iron and Steel Research Institute
    • GARCIA C. I.
    • Basic Metals Processing Research Institute, Department of Materials Science and Engineering, University of Pittsburgh
    • HUA M.
    • Basic Metals Processing Research Institute, Department of Materials Science and Engineering, University of Pittsburgh
    • CHO K.
    • Basic Metals Processing Research Institute, Department of Materials Science and Engineering, University of Pittsburgh
    • ZHANG Hongtao
    • Institute for Structural Materials, Central Iron and Steel Research Institute
    • DEARDO A. J.
    • Basic Metals Processing Research Institute, Department of Materials Science and Engineering, University of Pittsburgh

抄録

A comprehensive microstructure analyses were conducted for CSP processed Nb, Ti microalloyed steel, especially focusing on the precipitation behavior of the microalloying elements Nb and Ti. After coiling, the steel exhibits mainly a ferrite microstructure. The average ferrite grain size is 5.3 μm. The ferrite has a transitional morphology from polygonal ferrite to non-polygonal ferrite and is characterized by a moderate dislocation density of 2.47E+10/cm<sup>2</sup>. A high density of Nb, Ti complex star-like or cruciform shaped precipitates exist in the steel. They are Nb-rich and the average size is around 150 nm. About 49% Nb of the total in the steel is tied up in star-like precipitates, thus remarkably reducing the amount of Nb available for austenite conditioning, transformation temperature control and precipitation as small strengthening particles in ferrite. The main strengthening mechanisms found in the steel are the grain refinement and dislocation strengthening. Of the total yield strength, they represent contributions of 44% and 24%, respectively. There is a very little precipitation strengthening in the steel. It is thought that Nb, Ti complex star-like precipitate is prone to form in Ti-containing niobium microalloyed steel produced by compact strip processing.

収録刊行物

  • ISIJ international

    ISIJ international 46(9), 1345-1353, 2006-09-15

    The Iron and Steel Institute of Japan

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