针对某钢厂GCr15钢连铸坯质量问题，利用实验室试验和ProCAST模拟软件对连铸坯二次枝晶臂间距进行研究，分析过热度、拉速和二冷水量对二次枝晶臂间距的影响，并进一步探究碳偏析与二次枝晶臂间距的关系。结果表明，铸坯二次枝晶臂间距从铸坯表面到中心呈先增大后减小的趋势，与ProCAST模拟结果基本一致。降低过热度和拉速、增大二冷水量均有助于减小二次枝晶臂间距；为了提高连铸坯质量，建议将过热度、拉速和二冷水量分别控制在20 ℃、0.45 m/min、0.32 L/kg左右。铸坯碳偏析最大值位于柱状晶向等轴晶转变区域（CET）。
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.
关键词
大方坯 /
GCr15 /
显微组织 /
数值模拟 /
二次枝晶臂间距
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Key words
bloom /
GCr15 /
microstructure /
numerical simulation /
secondary dendrite arm spacing
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中图分类号：
TF76
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脚注
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基金
国家自然科学基金
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