2A14铝合金大铸锭半连续铸造过程数值模拟
|
摘要
基于ProCAST模拟软件建立了?630mm的2A14铝合金半连续铸锭的有限元模型,根据ProCAST热力学数据库确定了2A14铝合金热物性参数及力学性能参数,定义了半连续铸造过程的边界条件,采用移动边界法对半连续铸造凝固过程进行了模拟。仿真结果表明,铸锭内外冷却速率差过大而导致的较大收缩应力差是产生热裂纹的主要原因,适当降低铸造速度和浇注温度并增加冷却强度将使液穴变浅,糊状区变深,减少铸锭内外收缩应力差,从而降低热裂纹产生倾向。
A finite element model for 2A14 aluminum alloy large semi-continuous casting ingot was established by using ProCAST software.The thermo-physical parameters and mechanical properties of 2A14 aluminum alloy were determined by using thermodynamic database from the ProCAST.The complex boundary conditions of semicontinuous casting process were defined,and the simulation was carried out by adopting the moved boundary method.The simulated results revel that the difference of cooling rate of the ingot is too large,resulting in the large shrinkage stress difference,which are responsible for the generation of hot crack.Through decreasing the casting speed,pouring temperature and cooling strength,meninucus face is narrawed and mushy zone is deepen,reducing the difference of shrinkage stress of ingot,so as to reducing the hot cracking tendency.
A finite element model for 2A14 aluminum alloy large semi-continuous casting ingot was established by using ProCAST software.The thermo-physical parameters and mechanical properties of 2A14 aluminum alloy were determined by using thermodynamic database from the ProCAST.The complex boundary conditions of semicontinuous casting process were defined,and the simulation was carried out by adopting the moved boundary method.The simulated results revel that the difference of cooling rate of the ingot is too large,resulting in the large shrinkage stress difference,which are responsible for the generation of hot crack.Through decreasing the casting speed,pouring temperature and cooling strength,meninucus face is narrawed and mushy zone is deepen,reducing the difference of shrinkage stress of ingot,so as to reducing the hot cracking tendency.
引文
[1]王祝堂.变形铝合金热处理工艺[M].长沙:中南大学出版社,2011.
[2]WANG Q C,KE Y L,XIAO H Y,et al.Evaluation of residual stress relief of aluminum alloy 7050by using crack compliance method[J].Trans.Non-ferrous Met.Soc.China,2003,15(5):1 190-1 193.
[3]DAS S K.Thermal modeling of DC continuous casting including submould boiling heat transfer[J].Applied Thermal Engineering,1999(19):897-916.
[4]LE Q C,GUO S J,ZHAO Z H,et al.Numerical simulation of electroagnetic DC casting of magnesium alloys[J].Journal of Materials Processing Technology,2007,183:194-201.
[5]关敬波.7050铝合金大扁锭半连铸工艺参数匹配规律的仿真研究[D].长沙:中南大学,2007.
[6]潘冬,许庆彦,叶小刚,等.铝合金半连续铸造过程中的液穴温度分布[J].清华大学学报,2009,49(2):206-209.
[7]BARRAL P,QUINTELA P.A numerical algorithm for prediction of thermo-mechanical deformation during the casting of aluminum alloy ingots[J].Finite Elements in Analysis and Design,2000,34:125-143.
[8]COLLEY L J,WELLS M A,MAIJE D M R.Tensile properties of as-cast aluminum alloy AA5182close to the solidus temperature[J].Materials Science and Engineering,2004,A386:140-148.
[9]VAN HAAFTEN W M,KOOL W H,KATGERMAN L.Tensile behavior of semi-solid industrial aluminum alloys AA310-4 and AA5182[J].Materials Science and Engineering,2002,A336:1-6.
[10]HIROMI N,TAKATERU U.Prediction of internal cracking in a direct-chill cast,high strength,Al-Mg-Si ally[J].Journal of Light Metals,2002(2):161-167.
[11]蒋日鹏.超声场对高强铝合金凝固过程的影响规律与作用机理研究[D].长沙:中南大学,2014.
[12]胡化文,陈康华.超声熔体对合金显微组织和性能的影响[J].金属热处理,2005,30(5):43-46.
[13]谢麒麟,麻永林,李建超,等.直接冷却半连续铸造铝合金圆锭水冷边界试验研究[J].包头钢铁学院学报,2004,23(3):279-282.
[14]《轻合金材料加工手册》编写组.轻金属材料加工手册(下册)[M].北京:冶金工业出版社,1980.
[15]孙丽文,侯华,徐宏.铸件热应力及热裂的数值模拟研究[J].铸造设备研究,2006(3):20-22.
[16]廖敦明,林汉同,刘瑞祥,等.铸造热应力场数值模拟研究的最新进展[J].现代铸铁,2000(4):4-7.
[2]WANG Q C,KE Y L,XIAO H Y,et al.Evaluation of residual stress relief of aluminum alloy 7050by using crack compliance method[J].Trans.Non-ferrous Met.Soc.China,2003,15(5):1 190-1 193.
[3]DAS S K.Thermal modeling of DC continuous casting including submould boiling heat transfer[J].Applied Thermal Engineering,1999(19):897-916.
[4]LE Q C,GUO S J,ZHAO Z H,et al.Numerical simulation of electroagnetic DC casting of magnesium alloys[J].Journal of Materials Processing Technology,2007,183:194-201.
[5]关敬波.7050铝合金大扁锭半连铸工艺参数匹配规律的仿真研究[D].长沙:中南大学,2007.
[6]潘冬,许庆彦,叶小刚,等.铝合金半连续铸造过程中的液穴温度分布[J].清华大学学报,2009,49(2):206-209.
[7]BARRAL P,QUINTELA P.A numerical algorithm for prediction of thermo-mechanical deformation during the casting of aluminum alloy ingots[J].Finite Elements in Analysis and Design,2000,34:125-143.
[8]COLLEY L J,WELLS M A,MAIJE D M R.Tensile properties of as-cast aluminum alloy AA5182close to the solidus temperature[J].Materials Science and Engineering,2004,A386:140-148.
[9]VAN HAAFTEN W M,KOOL W H,KATGERMAN L.Tensile behavior of semi-solid industrial aluminum alloys AA310-4 and AA5182[J].Materials Science and Engineering,2002,A336:1-6.
[10]HIROMI N,TAKATERU U.Prediction of internal cracking in a direct-chill cast,high strength,Al-Mg-Si ally[J].Journal of Light Metals,2002(2):161-167.
[11]蒋日鹏.超声场对高强铝合金凝固过程的影响规律与作用机理研究[D].长沙:中南大学,2014.
[12]胡化文,陈康华.超声熔体对合金显微组织和性能的影响[J].金属热处理,2005,30(5):43-46.
[13]谢麒麟,麻永林,李建超,等.直接冷却半连续铸造铝合金圆锭水冷边界试验研究[J].包头钢铁学院学报,2004,23(3):279-282.
[14]《轻合金材料加工手册》编写组.轻金属材料加工手册(下册)[M].北京:冶金工业出版社,1980.
[15]孙丽文,侯华,徐宏.铸件热应力及热裂的数值模拟研究[J].铸造设备研究,2006(3):20-22.
[16]廖敦明,林汉同,刘瑞祥,等.铸造热应力场数值模拟研究的最新进展[J].现代铸铁,2000(4):4-7.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |