Liquid-solid interface control of BFe10-1-1 cupronickel alloy tubes during HCCM horizontal continuous casting and its effect on the microstructure and properties
来源期刊：International Journal of Minerals Metallurgy and Materials2013年第8期
论文作者：Jun Mei Xin-hua Liu Yan-bin Jiang Song Chen Jian-xin Xie
文章页码：748 - 758
摘 要：Based on horizontal continuous casting with a heating-cooling combined mold（HCCM） technology,this article investigated the effects of processing parameters on the liquid-solid interface（LSI） position and the influence of LSI position on the surface quality,microstructure,texture,and mechanical properties of a BFe10-1-1 tube（φ50 mm × 5 mm）.HCCM efficiently improves the temperature gradient in front of the LSI.Through controlling the LSI position,the radial columnar-grained microstructure that is commonly generated by cooling mold casting can be eliminated,and the axial columnar-grained microstructure can be obtained.Under the condition of 1250℃ melting and holding temperature,1200-1250℃ mold heating temperature,50-80 mm/min mean drawing speed,and 500-700 L/h cooling water flow rate,the LSI position is located at the middle of the transition zone or near the entrance of the cooling section,and the as-cast tube not only has a strong axial columnar-grained microstructure（{hkl}<621>,{hkl}<221>） due to strong axial heating conduction during solidification but also has smooth internal and external surfaces without cracks,scratches,and other macroscopic defects due to short solidified shell length and short contact length between the tube and the mold at high temperature.The elongation and tensile strength of the tube are 46.0%-47.2% and 210-221 MPa,respectively,which can be directly used for the subsequent cold-large-strain processing.
Jun Mei1,2，Xin-hua Liu1,2，Yan-bin Jiang1,2，Song Chen1,2，Jian-xin Xie1,2
1. Key Laboratory for Advanced Materials Processing(MOE),University of Science and Technology Beijing2. Institute for advanced Materials and Technology,University of Science and Technology Beijing
摘 要：Based on horizontal continuous casting with a heating-cooling combined mold（HCCM） technology,this article investigated the effects of processing parameters on the liquid-solid interface（LSI） position and the influence of LSI position on the surface quality,microstructure,texture,and mechanical properties of a BFe10-1-1 tube（φ50 mm × 5 mm）.HCCM efficiently improves the temperature gradient in front of the LSI.Through controlling the LSI position,the radial columnar-grained microstructure that is commonly generated by cooling mold casting can be eliminated,and the axial columnar-grained microstructure can be obtained.Under the condition of 1250℃ melting and holding temperature,1200-1250℃ mold heating temperature,50-80 mm/min mean drawing speed,and 500-700 L/h cooling water flow rate,the LSI position is located at the middle of the transition zone or near the entrance of the cooling section,and the as-cast tube not only has a strong axial columnar-grained microstructure（{hkl}<621>,{hkl}<221>） due to strong axial heating conduction during solidification but also has smooth internal and external surfaces without cracks,scratches,and other macroscopic defects due to short solidified shell length and short contact length between the tube and the mold at high temperature.The elongation and tensile strength of the tube are 46.0%-47.2% and 210-221 MPa,respectively,which can be directly used for the subsequent cold-large-strain processing.
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