工程科学学报，第39卷，第7期：9961007,2017年7月 Chinese Journal of Engineering,Vol.39,No.7:996-1007,July 2017 D0:10.13374j.issn2095-9389.2017.07.004:htp:/journals.ustb.edu.cm 凝固末端电磁搅拌和轻压下复合技术对大方坯高碳 钢偏析和中心缩孔的影响 安航航2》，包燕平)四，王敏”，赵立华”，王达志”，刘荣泉》，李鹏》 1)北京科技大学钢铁治金新技术国家重点实验室，北京1000832)北京科技大学治金与生态工程学院，北京100083 3)常熟市龙腾特种钢有限公司，常熟215500 区通信作者，E-mail:baoyp@usth.edu.cn 摘要基于ANSYS软件建立了310mm×360mm断面大方坯连铸过程二维凝固传热数学模型，并采用窄面射钉试验及铸 坯表面测温试验对模型的准确性进行了验证.通过模型研究了过热度、拉速和二冷比水量对铸坯中心固相率以及凝固坯壳 分布的影响，并结合高碳耐磨球钢BU的高温拉伸试验结果，确定了最佳的拉速以及最优轻压下压下区间要求.通过工业试 验对理论模型进行了验证，并分析研究了拉速对采用凝固末端电磁搅拌(FEMS)以及凝固末端17mm大压下量的轻压下技 术生产310mm×360mm断面大方坯高碳耐磨球钢BU铸坯的偏析和中心缩孔的影响.结果表明：采用凝固末端电磁搅拌和 轻压下复合技术，通过调整拉速优先满足轻压下压下区间要求，可显著降低中心偏析、V型偏析及中心缩孔，但如果仅达到凝 固末端电磁搅拌位置要求时，则铸坯中心质量不会得到明显改善。拉速为0.52m·m且轻压下压下区间铸坯中心固相率 为0.30~0.75时，偏析和中心缩孔有很大程度的改善，不合理的压下量分配会引起铸坯出现内裂纹以及中心负偏析. 关键词大方坯：高碳耐磨球钢：偏析：凝固末端电磁搅拌：轻压下 分类号TF777.2 Effect of combining F-EMS and MSR on the segregation and shrinkage cavity in con- tinuously cast high-earbon steel blooms AN Hang-hang':,BA0 Yan-ping》a,WANG Min'',ZHAO Li-hua”,WANG Da--hi',LIU Rong-quan》,LI Peng》 1)State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China 2)School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China 3)Changshu Longteng Special Steel Co.Ltd.,Changshu 215500,China Corresponding author,E-mail:baoyp@ustb.edu.cn ABSTRACT This study established a two-dimensional mathematical model of solidification and heat transfer for a bloom with a 310mmx 360 mm cross-section using ANSYS software,which was verified by nail-shooting experiments in the narrow side of the bloom and surface temperature testing.The effect of the casting process parameters,such as superheat,casting speed,and secondary cooling intensity,on the solid fraction in the strand centerline and the solidified shell was investigated.Moreover,the optimum casting speed and the optimum solid fraction in the core of the partially solidified strand throughthe soft reduction zone were determined by the model considering the hot ductility of the high-earbon wear-resistant ball steel BU.Plant trials of BU with different casting speeds were performed to validate the theoretical model and analyze the effect of the casting speed on the segregation and shrinkage cavity of BU on a 310 mm x 360 mm bloom caster equipped with final electromagnetic stirring (F-EMS)combined with mechanical soft reduction (reduction amount with 17mm).The results show that the inner defects (e.g.,center segregation,V-segregation,and shrinkage cav- 收稿日期：2016-1005 基金项目：国家自然科学基金资助项目(51404018)：钢铁治金新技术国家重点实验室自主基金资助项目(41614014)工程科学学报，第 39 卷，第 7 期: 996--1007，2017 年 7 月 Chinese Journal of Engineering，Vol． 39，No． 7: 996--1007，July 2017 DOI: 10． 13374 /j． issn2095--9389． 2017． 07． 004; http: / /journals． ustb． edu． cn 凝固末端电磁搅拌和轻压下复合技术对大方坯高碳 钢偏析和中心缩孔的影响 安航航1，2) ，包燕平1) ，王 敏1) ，赵立华1) ，王达志1) ，刘荣泉3) ，李 鹏3) 1) 北京科技大学钢铁冶金新技术国家重点实验室，北京 100083 2) 北京科技大学冶金与生态工程学院，北京 100083 3) 常熟市龙腾特种钢有限公司，常熟 215500 通信作者，E-mail: baoyp@ ustb． edu． cn 收稿日期: 2016--10--05 基金项目: 国家自然科学基金资助项目( 51404018) ; 钢铁冶金新技术国家重点实验室自主基金资助项目( 41614014) 摘 要 基于 ANSYS 软件建立了 310 mm × 360 mm 断面大方坯连铸过程二维凝固传热数学模型，并采用窄面射钉试验及铸 坯表面测温试验对模型的准确性进行了验证． 通过模型研究了过热度、拉速和二冷比水量对铸坯中心固相率以及凝固坯壳 分布的影响，并结合高碳耐磨球钢 BU 的高温拉伸试验结果，确定了最佳的拉速以及最优轻压下压下区间要求． 通过工业试 验对理论模型进行了验证，并分析研究了拉速对采用凝固末端电磁搅拌( F--EMS) 以及凝固末端 17 mm 大压下量的轻压下技 术生产 310 mm × 360 mm 断面大方坯高碳耐磨球钢 BU 铸坯的偏析和中心缩孔的影响． 结果表明: 采用凝固末端电磁搅拌和 轻压下复合技术，通过调整拉速优先满足轻压下压下区间要求，可显著降低中心偏析、V 型偏析及中心缩孔，但如果仅达到凝 固末端电磁搅拌位置要求时，则铸坯中心质量不会得到明显改善． 拉速为 0. 52 m·min － 1且轻压下压下区间铸坯中心固相率 为 0. 30 ～ 0. 75 时，偏析和中心缩孔有很大程度的改善，不合理的压下量分配会引起铸坯出现内裂纹以及中心负偏析． 关键词 大方坯; 高碳耐磨球钢; 偏析; 凝固末端电磁搅拌; 轻压下 分类号 TF777. 2 Effect of combining F--EMS and MSＲ on the segregation and shrinkage cavity in con￾tinuously cast high-carbon steel blooms AN Hang-hang1，2) ，BAO Yan-ping1)  ，WANG Min1) ，ZHAO Li-hua1) ，WANG Da-zhi1) ，LIU Ｒong-quan3) ，LI Peng3) 1) State Key Laboratory of Advanced Metallurgy，University of Science and Technology Beijing，Beijing 100083，China 2) School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China 3) Changshu Longteng Special Steel Co． Ltd． ，Changshu 215500，China Corresponding author，E-mail: baoyp@ ustb． edu． cn ABSTＲACT This study established a two-dimensional mathematical model of solidification and heat transfer for a bloom with a 310 mm × 360 mm cross-section using ANSYS software，which was verified by nail-shooting experiments in the narrow side of the bloom and surface temperature testing． The effect of the casting process parameters，such as superheat，casting speed，and secondary cooling intensity，on the solid fraction in the strand centerline and the solidified shell was investigated． Moreover，the optimum casting speed and the optimum solid fraction in the core of the partially solidified strand throughthe soft reduction zone were determined by the model considering the hot ductility of the high-carbon wear-resistant ball steel BU． Plant trials of BU with different casting speeds were performed to validate the theoretical model and analyze the effect of the casting speed on the segregation and shrinkage cavity of BU on a 310 mm × 360 mm bloom caster equipped with final electromagnetic stirring ( F--EMS) combined with mechanical soft reduction ( reduction amount with 17 mm) ． The results show that the inner defects ( e． g． ，center segregation，V-segregation，and shrinkage cav-