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对55SiMnVB弹簧钢连铸坯的凝固组织进行分析。实验结果表明:55SiMNCVB弹簧钢铸坯凝固组织较疏松,二次枝晶臂间距为100-250μm,较一般合金钢小;铸坯中夹杂物面积百分含量偏高,为0.71-1.28%。降低钢液过热度和提高凝固末端电磁搅拌强度对提高中心等轴晶率,减轻铸坯中心偏析有效果。 相似文献
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本文讨论了1Cr18Ni9Ti钢的铸坯显微凝固组织和宏观的柱状晶“穿晶”凝固结构,并介绍了δ铁素体在水平连铸坯的分布情况。 相似文献
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《钢铁研究学报(英文版)》2011,(Z2):371-376
The solidification structure was simulated by the commercial software CALCOSOFT under the real cooling condition during the continuous casting processes in this paper. The cellular automation-finite element model (CA-FE) was applied to simulate the microstructure of the slab, and the results were compared with the actual macrostructure. The results of microstructure simulated were in good agreement with that detected in the slabs. In addition, the solidification structure under different secondary cooling intensity was simulated. The results show that when specific water flows increase, the average grain surface area reduces, and columnar grains have the tendency to be longer. 相似文献
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Characteristic Parameters for Dendritic Microstructure of Solidification During Slab Continuous Casting 总被引:1,自引:0,他引:1
The operating conditions during the continuous casting process have a great effect on the microstructure of slab solidification, including primary and secondary dendritic arm spacing. On the basis of the analysis of available work, a revised expression for describing secondary dendritic arm spacing during solidification of slab continuous casting was presented, and the relation between the ratio of primary dendritic arm spacing to secondary dendritic arm spacing and the cooling rate was obtained. 相似文献
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The solidification structure of a continuous casting large round billet was analyzed by a cellular-automaton-finite-element coupling model using the ProCAST software.The actual and simulated solidification structures were compared under mold electromagnetic stirring (MEMS)conditions (current of 300 A and frequency of 3 Hz).There-after,the solidification structures of the large round billet were investigated under different superheats,casting speeds,and secondary cooling intensities.Finally,the effect of the MEMS current on the solidification structures was obtained under fixed superheat,casting speed,secondary cooling intensity,and MEMS frequency.The model accurately simulated the actual solidification structures of any steel,regardless of its size and the parameters used in the continuous casting process.The ratio of the central equiaxed grain zone was found to increase with decreasing su-perheat,increasing casting speed,decreasing secondary cooling intensity,and increasing MEMS current.The grain size obviously decreased with decreasing superheat and increasing MEMS current but was less sensitive to the casting speed and secondary cooling intensity. 相似文献
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推导了连铸过程中二冷喷淋强度与连铸参数之间的关系,比较了喷淋强度对2种断面连铸坯凝固组织的影响。结果表明,喷淋强度能更精确地反映铸坯凝固组织与冷却参数间的关系;铸坯表面的枝晶间距为20 μm左右,而中心区为200~350 μm;距表面相同距离,对角线区的枝晶比横向细小。喷淋强度相近时铸坯的凝固规律为:200 mm×200 mm断面中心区组织较细小,150 mm×150 mm断面近中心区组织较细小。从铸坯表面到中心整体上符合凝固曲线左侧规律,但断面大于200 mm×200 mm的连铸坯,中心和近中心区凝固时符合凝固曲线右侧规律。 相似文献