Effect of Boron on Mechanical Properties and Recrystallization Behavior of Ti-added Ultra-low Carbon Cold-rolled Steel Sheets

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著者

    • HAGA Jun
    • Corporate Research & Development Laboratories, Sumitomo Metal Industries, Ltd.
    • MIZUI Naomitsu
    • Corporate Research & Development Laboratories, Sumitomo Metal Industries, Ltd.
    • OKAMOTO Atsuki
    • Corporate Research & Development Laboratories, Sumitomo Metal Industries, Ltd.

抄録

Effect of boron (B) on mechanical properties and recrystallization behavior of Ti-added IF steel sheets was studied. Recovery-, nucleation- and grain growth-rates were measured separately in order to clarify the effect of B on recovery and recrystallization process. <br> Grain size of hot band was constant regardless of B addition. However, Lankford value (<I>r</I>-value) of annealed steel sheets was lowered with increasing B content. Recrystallization finishing temperature rose remarkably with increasing B content up to 5 ppm, and gradually over 5 ppm. Recovery rate was not varied with increasing B content up to 5 ppm, and decreased over 5 ppm. Nucleation rate of recrystallized grains decreased drastically with increasing B content up to 5 ppm, and slightly decreased with increasing B content over 5 ppm. Growth rate of recrystallized grains decreased progressively with increasing B content up to 16 ppm, and was not varied so much over 16 ppm. The suppression in nucleation and growth was thought to be due to the B segregation to the prior grain boundary of hot band and to the boundary of nuclei, respectively.

収録刊行物

  • ISIJ international  

    ISIJ international 38(6), 580-586, 1998-06-15 

    The Iron and Steel Institute of Japan

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