Vol.20 No.4 毛卫民等：电磁搅拌对半固态钢铁组织的影响 ·335· 2 Flemings M C.Behaviour of Metal Alloys in the Semi-solid State.Metall Trans,1991,22(A):957 3 Brown S B,Flemings M C.Net-shape Forming via Semi-solid Processing.Adv Mater Process,1993, 143:36 4 Midson S P.The Commercial Status of Semi-solid Casting in the USA.In:Kirkwood D H,Kapranos P,eds.The 4th Int Conf on Semi-Solid Processing of Alloys and Compositions.UK:University of Sheffield,1996.251 5 Flemings M C,Young K P.Riek R G.Thixocasting of Steel.In:9th SDCE Interational Die Casting Exposition Congress.Milwaukee,Wisconsin,USA,1977.G-T77-092 6 Kapranos P,Kirkwood D H,Sellars C M.Thixoforrming High Point Alloys into Non-metallic Dies. In:Kirkwood D H,Kapranos P,eds.The 4th Int Conf on Semi-Solid Process-ing of Alloys and Compositions.UK:University of Sheffield,1996.306 7 Hellawell A.Grain Evolution in Conventional and Rheocastings.In:Kirkwood D H,Kapranos P,eds. The 4th Int Conf on Semi-Solid Processing of Alloys and Compositions.UK:University of Sheffield, 1996.60 Effect of Electromagnetic Stirring on the Primary Austinite in the Semi-Solid Cast Iron and Spring Steel Mao Weimin Zhao Aimin Cui Chenglin Li Yanjun Zhong Xueyou Material Science and Engineering School,UST Beijing,Beijing 100083.China ABSTRACTS The effects of electromagnetic stirring on the primary austenite in the cast iron and as-caststructures of the spring steel was studied.The experiments had shown that the primarily large austenitic dendrites can be fined when stirred by electromagnetic field for a short time and the higher the stirring power,the more sphercal or dedendritic the primary austenite,and that the fluid flow and temperature fluctuation of the melt may be induced by stirring,and accelerate the remelting of the second arm and decrease of the length of the first arm so that the primarily dendritic austenite is changed to spherical shape finally.That the column dendrites of the samples of spring steel can be also fined by the strong electromagnetic stirring and changed into fine equiaxed grains. KEY WORDS electromagnetic stirring;semi-solid metal;microstructure;cast iron;spring steel