Microstructure Evolution in Hot Ring Rolling of Centrifugal Casting Q235B Steel
QIN Fangcheng1, QI Huiping2, LI Yongtang2, QI Haiquan1
1 College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China 2 School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
Abstract: The urgent issue on casting-rolling compound forming (CRCF) is to study the integrated control of geometrical dimensions and microstructure modification in hot ring rolling of casting blank. The microstructure evolution models of centrifugal casting Q235B steel are established by employing hot compression tests. The coupled analysis of deformation-heating-microstructure evolution in hot rolling of casting ring blank is realized based on the DEFORM-3D platform. The effects of feed rate and initial temperature on microstructure evolution are clarified. It is found that, as the feed rate increases, the dynamic recrystallization (DRX) volume fraction and average grain size decrease. When the initial temperature increases, the DRX volume fraction increases, but the average grain size decreases and its distribution is homogeneous at 1 150 ℃. It is shown from the industrial test on hot rolling of the centrifugal casting Q235B blank that the mechanical properties of the rolled ring meet the standard technical demand. The through-thickness grains are refined, especially the average diameter approximately 30—38 μm near the outer-and inner-layers, which are less than that near the middle-layer with 52—57 μm. Therefore, it is feasible to fabricate Q235B steel rings directly hot-rolled from the centrifugal casting ring blank. The integrated control of deformation and modification in the ring blank can be achieved.
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2020, Vol. 34 
