5182 Al alloy ingots with the diameters of 100 mm are produced by conventional and combined electromagnetic fields (CEMF) horizontal direction chill (HDC) cast- ing process. The effect of CEMF on the ingot surface...5182 Al alloy ingots with the diameters of 100 mm are produced by conventional and combined electromagnetic fields (CEMF) horizontal direction chill (HDC) cast- ing process. The effect of CEMF on the ingot surface quality and floating grains is investigated. The results show that the CEMF is effective in reducing the segregation layer in both top and bottom sub-surfaces. Big floating grains with coarse dendrite arms mainly distribute in the crescent-shaped area near the bottom in the conven- tional HDC casting ingot. With the application of the CEMF, they disappear in the whole cross section of the HDC casting ingot and the equiaxed grains are significantly refined.展开更多
The combination of electromagnetic field is applied in the Horizontal Direct Chill(HDC)casting process to produce 3004 aluminum alloy ingot.The effect of combination of electromagnetic field on the ingot surface quali...The combination of electromagnetic field is applied in the Horizontal Direct Chill(HDC)casting process to produce 3004 aluminum alloy ingot.The effect of combination of electromagnetic field on the ingot surface quality and inner structure was investigated by macro and micro-structure observation.The results show that the combination of electromagnetic field can improve the ingot surface quality and inner structure effectively.The thickness of segregation layer decreased with the application of combination of electromagnetic field.In addition,the combination of electromagnetic field can effectively improve the as-casting structure.Under the function of combination of electromagnetic field,coarse columnar grains transfer to fine equiaxed grains.展开更多
在传统热顶铸造基础上,开发了一种新的热顶铸造结晶器,并在铸造过程中施加了低频电磁场,得出了稳定铸造φ500 mm 7050高强铝合金铸锭的工艺条件;当电磁场频率为15 Hz、磁场强度为10000 At时,铸造出了表面光滑的铸锭.采用偏光显微镜(Leic...在传统热顶铸造基础上,开发了一种新的热顶铸造结晶器,并在铸造过程中施加了低频电磁场,得出了稳定铸造φ500 mm 7050高强铝合金铸锭的工艺条件;当电磁场频率为15 Hz、磁场强度为10000 At时,铸造出了表面光滑的铸锭.采用偏光显微镜(Leica DMI)观察试样,分析试样的微观组织.实验结果表明:铸造过程中施加低频电磁场能提高铸锭的表面质量,细化铸锭的内部组织,以及抑制铸锭内部裂纹的产生.总结了低频电磁铸造改善表面质量和细化组织的原因以及低频电磁场对液穴形状的影响.展开更多
基金supported by the National Natural Science Foundation of China(Nos.51204053 and 51074048)Research Fund for the Doctoral Program of Higher Education of China(No.20090042120001)+2 种基金Central University Basic R&D Operating Expenses(No.N100409006)China Postdoctoral Science Foundation(No.20110491518)National Basic Research Program of China(973Program)(No.2012CB619506)
文摘5182 Al alloy ingots with the diameters of 100 mm are produced by conventional and combined electromagnetic fields (CEMF) horizontal direction chill (HDC) cast- ing process. The effect of CEMF on the ingot surface quality and floating grains is investigated. The results show that the CEMF is effective in reducing the segregation layer in both top and bottom sub-surfaces. Big floating grains with coarse dendrite arms mainly distribute in the crescent-shaped area near the bottom in the conven- tional HDC casting ingot. With the application of the CEMF, they disappear in the whole cross section of the HDC casting ingot and the equiaxed grains are significantly refined.
基金Item Sponsored by Natural Science Foundation (5107404) the Ministry of Education New Teachers Fund Project (20090042120001) +1 种基金Central University Basic R&D Operating Expenses (N100409006) China Postdoctoral Science Foundation (20110491518)
文摘The combination of electromagnetic field is applied in the Horizontal Direct Chill(HDC)casting process to produce 3004 aluminum alloy ingot.The effect of combination of electromagnetic field on the ingot surface quality and inner structure was investigated by macro and micro-structure observation.The results show that the combination of electromagnetic field can improve the ingot surface quality and inner structure effectively.The thickness of segregation layer decreased with the application of combination of electromagnetic field.In addition,the combination of electromagnetic field can effectively improve the as-casting structure.Under the function of combination of electromagnetic field,coarse columnar grains transfer to fine equiaxed grains.