离心铸造Q235B钢环件热辗扩过程中的组织演变

doi:10.11896/cldb.19050064

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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.

Key words： casting-rolling compound forming ring parts Q235B steel centrifugal casting grain size

Published: 29 May 2020

CLC number:

TG335

Fund:This work was supported by National Natural Science Foundation of China (51875383, 51575371), Natural Science Foundation of Guangxi (2019GXNSFAA245051,2018GXNSFBA281056), Innovation Project of Guangxi (2018AA23004), Research Foundation of Guilin University of Technology (GUTQDJJ2017140).

About author:: Fangcheng Qin is a lecturer and postgraduate supervisor of Guilin University of Technology. His research is mainly focused on the continuous and precision forming technique of metallic materials and the control of microstructure and performance in precision plastic forming. In recent years, Dr. Qin has been a leader or participant of five projects funded by the National Natural Science Foundation of China, the Natural Science Foundation of Guangxi Province and the corporation research for firms. Dr. Qin has published more than 20 papers in scientific journals, 13 of which are included in SCI/EI and has attained 10 invention patents.
Huiping Qi is an associate professor and postgraduate supervisor of Taiyuan University of Science and Technology. In recent years, her research is mainly focused on the new casting-rolling composite forming process of ring parts. Dr. Qi has been a leader of three projects funded by National Natural Science Foundation of China and two projects funded by Department of Science and Technology of Shanxi Province. She has participated in many important international academic conferences such as IMECE2015 and ICTP2017. Dr. Qi has won a second prize of Shanxi Pro-vince Science and Technology Progress, a Second Prize of Shanxi province technology invention and an honorable mention of China patent. Dr. Qi has published more than 30 papers and 8 China invention patents.

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Cite this article:

QIN Fangcheng,QI Huiping,LI Yongtang, et al. Microstructure Evolution in Hot Ring Rolling of Centrifugal Casting Q235B Steel[J]. Materials Reports, 2020, 34(12): 12132-12138.

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http://www.mater-rep.com/EN/10.11896/cldb.19050064 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12132

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