螺旋环缝电磁场对7075合金熔体处理过程中多物理场及组织的影响
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摘要
采用Ansys Workbench软件对螺旋环缝式电磁场作用下7075铝合金熔体处理过程中的电磁场、流场及温度场进行了耦合数值模拟。结果表明,与旋转电磁场相比,螺旋电磁场能同时在轴向及径向上对熔体施加较强的剪切作用,降低了7075铝合金熔体的温度梯度。试生产结果表明,经螺旋环缝式电磁搅拌处理后的7075铝合金平均晶粒尺寸减小且均匀性明显提高,宏观偏析也得到明显改善,试验结果与模拟结果一致。
The electromagnetic field,flow field and thermal field of 7075 aluminum alloy during melt treatment in spiral annular electromagnetic field were simulated by the commercial numerical software Ansys Workbench.Numerical results show that compared with rotating electromagnetic field,the 7075 alloy melt is stirred forcely by a spiral electromagnetic field both in radial and axial directions.The temperature gradient of the 7075 alloy melt is narrawed.Subsequently,the numerical results were verified experimentally,and the experimental results were consistent with the numerical ones.The average grain size of 7075 alloy treated by spiral annular electromagnetic field is reduced,and the uniformity is improved obviously.The macro-segregation of the 7075 alloy casting is decreased obviously.
The electromagnetic field,flow field and thermal field of 7075 aluminum alloy during melt treatment in spiral annular electromagnetic field were simulated by the commercial numerical software Ansys Workbench.Numerical results show that compared with rotating electromagnetic field,the 7075 alloy melt is stirred forcely by a spiral electromagnetic field both in radial and axial directions.The temperature gradient of the 7075 alloy melt is narrawed.Subsequently,the numerical results were verified experimentally,and the experimental results were consistent with the numerical ones.The average grain size of 7075 alloy treated by spiral annular electromagnetic field is reduced,and the uniformity is improved obviously.The macro-segregation of the 7075 alloy casting is decreased obviously.
引文
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[18] QIU L,LI Q,LIU W.Modeling and experiments on electromagnetic separation of inclusions from aluminum melt under combined magnetic field[J].Rare Metal Materials and Engineering,2014,43:1 793-1 797.
[2] UMAMAHESHWER R,VASU A C,GOVINDARAJU V,et al.Stress corrosion cracking behaviour of 7xxx aluminum alloys:A literature review[J].Transactions of Nonferrous Metals Society of China,2016,26:1 447-1 471.
[3] ZUO J,HOU L,SHI J,et al.The mechanism of grain refinement and plasticity enhancement by an improved thermomechanical treatment of 7055Al alloy[J].Materials Science and Engineering,2017,A702:42-52.
[4]徐骏.强制均匀凝固组织精确控制技术[J].中国材料进展,2010,29(11):26-30.
[5]李楠,邢书明,郭文龙,等.流变挤压铸造7075铝合金的组织及力学性能[J].特种铸造及有色合金,2008(s):419-423.
[6] HAN Y,SAMUEL A M,DOTY H W.Optimizing the tensileproperties of Al-Si-Cu-Mg 319-type alloys:Role of solution heat treatment[J].Materials and Design,2014,58(6):426-438.
[7]戴晓元.含钪Al-Zn-Mg-Cu-Zr超高强铝合金组织与性能的研究[D].长沙:中南大学,2008.
[8]李海,杨迎新,郑子樵,等.少量Sc对7055铝合金组织与性能的影响[J].材料科学与工艺,2006,14(1):46-49.
[9]蔡郭生,王笃雄.Al-5Ti-1B对铸造702A铝合金组织和性能的影响[J].铸造,2013,62(5):445-447.
[10] FAN Z.Semisolid metal processing[J].Metallurgical Reviews,2002,47(2):49-85.
[11]张明,李晓谦,黎正华,等.功率超声对铸造7075合金中显微疏松的影响[J].特种铸造及有色合金,2011,31(2):174-177.
[12]杨小容,毛卫民,裴胜.直管浇注法制备半固态坯料的研究[J].特种铸造及有色合金,2008,28(3):186-188.
[13]王志刚,徐骏,李豹.7075铝合金流变挤压铸造研究[J].特种铸造及有色合金,2014,34(1):54-57.
[14]白月龙,毛为民,高松福,等.流变压铸工艺参数对半固态A356铝合金充填性的影响[J].北京科技大学学报,2006,28(7):645-649.
[15]路贵民,董杰,崔建忠,等.液相线半连续铸造7075Al合金二次加热与触变成形[J].金属学报,2001,37(11):1 184-1 188.
[16]范学燚,张喆,苏彦庆,等.行波磁场对ZL205A合金元素分布的影响[J].特种铸造及有色合金,2017,37(11):1 183-1 186.
[17]高志华,徐骏,张志峰,等.环缝式电磁搅拌对7075铝合金热处理的影响[J].特种铸造及有色合金,2014,34(2):163-166.
[18] QIU L,LI Q,LIU W.Modeling and experiments on electromagnetic separation of inclusions from aluminum melt under combined magnetic field[J].Rare Metal Materials and Engineering,2014,43:1 793-1 797.