GCr15轴承钢方坯连铸凝固组织数值模拟研究  

Numerical Simulation on Solidification Structure of GCr15 Bearing Steel Billet during Continuous Casting

作　　者：鲁素玲[1,2] 李江南 郭志红 赵瑞华[3] 朱立光 LU Suling;LI Jiangnan;GUO Zhihong;ZHAO Ruihua;ZHU Liguang(College of Material Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050054;Hebei Key Laboratory of Material Near-Net Forming Technology,Shijiazhuang 050054;Technol-ogy Center,Shijiazhuang Iron and Steel Co.,Ltd.,Shijiazhuang 050031)

机构地区：[1]河北科技大学材料科学与工程学院,石家庄050018 [2]河北省材料近净成形技术重点实验室,石家庄050018 [3]石家庄钢铁有限责任公司技术中心,石家庄050031

出　　处：《特种铸造及有色合金》2025年第2期208-214,共7页Special Casting & Nonferrous Alloys

基　　金：河北省重点研发计划项目(21311002D);河北省重大科技支撑计划项目(242Q9910Z);河钢集团重大科技项目(HG2024127)。

摘　　要：为研究连铸工艺参数对GCr15轴承钢铸坯凝固组织的影响,基于ProCAST软件中的CAFE模块建立了铸坯凝固组织模型,通过温度场和凝固组织模拟验证模型准确性,研究了钢水过热度、铸坯拉速和二冷区冷却强度对连铸坯凝固组织的影响。结果表明,降低过热度、提高拉速和降低二冷区冷却强度均可提高中心等轴晶占比以及细化晶粒。其中降低过热度效果最明显,每降低10℃,中心等轴晶的平均占比增加了15.80%,晶粒平均尺寸降低了3.18%;提高拉坯速度或降低二冷区冷却强度也可使铸坯中心等轴晶占比和晶粒个数增多,但相较于改变过热度来说影响较小。A solidification structure model was established based on CAFE module in ProCAST to explore the influ⁃ence of continuous casting process conditions on solidification structure of GCr15 bearing steel billet,and the accuracy was verified in terms of temperature field and solidification structure.Effects of superheat of molten steel,drawing speed of billet and cooling intensity of secondary cooling zone on solidification structure of continuous casting billet were investigated.The results indicate that the proportion of central equiaxed crystals is increased and grains are refined by reducing superheat and secondary cooling intensity as well as enhancing drawing speed,where the effect of super⁃heat reduction is the most obvious.For each 10℃decrease,the average proportion of central equiaxed crystals is increased by 15.80%and the average grain size is decreased by 3.18%.With enhancing the drawing speed or decreas⁃ing the secondary cooling strength,the proportion of equiaxed grains and the number of grains in the center of casting billet are also increased,which have a less effect than that of changing superheat.

关 键 词：轴承钢 方坯连铸 凝固组织 数值模拟 

分 类 号：TG249.7[金属学及工艺—铸造] TP311[自动化与计算机技术—计算机软件与理论]