杨景军,庞瑞朋,成国光

• 1:北京科技大学钢铁冶金新技术国家重点实验室
• 2:北京科技大学冶金与生态工程学院

摘要(Abstract)：

用实验与模拟计算相结合的方法研究了水冷条件下430铁素体不锈钢的温度场分布、流场分布及凝固组织。水冷条件下,铸件的凝固组织几乎都是等轴晶,当顶部的传热系数h=100 W/(m2·K),四周和底部的传热系数h=2000 W/(m2·K)时,模拟计算的凝固组织与实验得到的组织基本一致。采用CAFE模块对水冷条件下铁素体不锈钢凝固过程的温度场和流场进行分析,得到铸件底部凝固前沿和液相线前沿温度梯度最大分别为6.75 K/mm和7.15 K/mm,从侧壁到中心,液相线前沿和凝固前沿的温度梯度逐渐降低;铸件底部到顶部固液两相区的宽度逐渐增加然后减小,固液两相区内流体流动速率逐渐降低,在底部达到最大值4.23 mm/s;液相线前沿流体流动速率呈逐渐增大的趋势,平均值为2.40 mm/s。

关键词(KeyWords)： 温度场;流动速率;不锈钢;铸造

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51374020)

作者(Author): 杨景军,庞瑞朋,成国光

DOI: 10.13289/j.issn.1009-6264.2014.05.039

参考文献(References)：

• [1]David R J,Haruyuki I,Shinji M,et al.Microstructural development during directional solidification ofα-seeded TiAl alloys[J].Acta Materialia,2006,54(4):1077-1085.
• [2]Chung S I,Yoon J K.Numerical analysis of effect of electromagnetic stirring on solidification phenomena in continuous casting[J].Ironmaking and Steelmaking,1996,23(5):425-432.
• [3]马幼平.金属凝固理论与技术[M].北京:冶金工业出版社,2008:76.
• [4]SooHo Park,Kwang Yuk Kim,Yong Deuk Lee.Evolution of microstructure and texture associated with rodging in ferritic stainless steel[J].ISIJ International,2002,42(1):100-111.
• [5]Dong H B,Lee P D.Simulation of the columnar-to-equiaxed transition in directionally solidified Al–Cu alloys[J].Acta Materialia,2005,53(3):659-668.
• [6]Gandin C A,Desbiolles J L,Rappaz M,et al.A three-dimensional cellular automation-finite element model for the prediction of solidification grain structures[J].Metallurgical and Materials Transaction A,1999,30(12):3153-3165.
• [7]张红伟,Nankahima Keiji,王恩刚,等.Al-Si合金宏观偏析、凝固组织演变的元胞自动机-控制容积法耦合模拟[J].中国有色金属学报,2012,22(7):1883-1896.ZHANG Hong-wei,NAKAJIMA Keiji,WANG En-gang,et al.Simulation of macrosegregation and solidification microstructure evolution for Al-Si alloy by coupled cellular automatonfinite volume model[J].The Chinese Journal of Nonferrous Metals,2012,22(7):1883-1896.
• [8]Chang S R,Kim J M,Hong C P.Numerical simulation of microstructure evolution of Al alloys in centrifugal casting[J],ISIJ International,2001,41(7):738-747.
• [9]Gandin C A,Rappaz M.A coupled finite element-cellular automaton model for the prediction of dendritic grain structure in solidification processes[J].Acta Metall Master,1994,42(7):2233-2246.
• [10]王金龙,王福明,李长荣,等.碳与磷含量对易切削钢9SMn28微观组织的影响[J].材料热处理学报,2010,31(2):60-64.WANG Jin-long,WANG Fu-ming,LI Chang-rong,et al.Effect of carbon and phosphor contents on microstructure of a free cutting steel 9SMn28[J].Transaction of Materials and Heat Treatment,2010,31(2):60-64.
• [11]WANG Jin long,WANG Fu ming,Li Chang rong,et al.Simulation of 3D-microstructure in free-cutting steel 9SMn28 under water cooling condition with convection and porosity[J].ISIJ International,2010,50(2):222-230.
• [12]Zhu M F,Hong C P.A modified cellular automaton model for the simulation of dendritic growth in solidification of alloy[J].ISIJ International,2001,41(5):436-445.

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