Jia Guo, Aimin Guo, Hui Guo, Ying Wang, Jing Li,  and Xinlai He, Effect of zirconium addition on the austenite grain coarsening behavior and mechanical properties of 900 MPa low carbon bainite steel, J. Univ. Sci. Technol. Beijing, 15(2008), No. 6, pp. 688-695. https://doi.org/10.1016/S1005-8850(08)60272-8
Cite this article as:
Jia Guo, Aimin Guo, Hui Guo, Ying Wang, Jing Li,  and Xinlai He, Effect of zirconium addition on the austenite grain coarsening behavior and mechanical properties of 900 MPa low carbon bainite steel, J. Univ. Sci. Technol. Beijing, 15(2008), No. 6, pp. 688-695. https://doi.org/10.1016/S1005-8850(08)60272-8
Materials

Effect of zirconium addition on the austenite grain coarsening behavior and mechanical properties of 900 MPa low carbon bainite steel

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  • Corresponding author:

    Jia Guo    E-mail: guojia1017@sohu.com

  • Received: 27 November 2007
  • The ultra-fine bainitic microstructure of a 900 MPa low carbon bainitic Cu-Ni-Mo-B steel was obtained by a newly developed relaxation precipitation control (RPC) phase transformation processing. In a pan-cake like prior-austenite grain, the micro- structure consisted of lath bainite, a little of abnormal granular bainite, and acicular ferrite. The effect of zirconium carbonitrides on the austenite graincoarsening behavior was studied by transmission electron microscopy (TEM). The results show that, the lath is narrower with increasing cooling rate. The ratio of all kinds of bainitic microstructure is proper with the intermediate cooling rate; and Zr-containing precipitates distribute uniformly, which restrains austenite grain growing in heat-affected welding zone.
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