Numerical simulation of secondary dendrite arm spacing of bearing steel bloom
WANG Lu1,SUN Yan-hui1,JIAO Shuai1,ZHAO Yong1,WANG De-jiong2,YIN Hao2
(1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing,Beijing 100083, China 2. Special Steel Division, Nanjing Iron and Steel Co., Ltd.,Nanjing 210035, Jiangsu, China)
Abstract:The secondary dendrite arm spacing(SDAS) was studied by laboratory experiments and ProCAST simulation software in order to solve the continuous casting billet quality problems of GCr15 Steel,the effects of superheat,casting speed and secondary cooling intensity on the SDAS were also analyzed,and further investigated the relationship between the carbon segregation and the SDAS. The results show that the SDAS of the bloom increases at first and then decreases from the surface to the center,which is consistent with the ProCAST simulation results. Reducing superheat and casting speed,increasing secondary cooling intensity are helpful to reduce the SDAS,so in order to improve the quality of continuous casting billet,it is recommended to control superheat at 20 ℃,casting speed at 0.45 m/min and secondary cooling intensity respectively at about 0.32 L/kg. The max carbon segregation of bloom often occurs in the columnar-to-equiaxed transition (CET) zone.
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