将脉冲电流作用于铁素体不锈钢,发现经过脉冲电流处理后等轴晶比例大幅增加,晶粒明显缩小。建立了考虑集肤效应的三维电磁场瞬态有限元模型,利用ANSYS软件对电极及熔体内的电场、磁场、电磁力分布进行了计算,结果表明,由于集肤效应使得电磁场主要集中在电极周围和熔体上部,且在脉宽的后期电磁场的方向由于涡流的存在而发生变化;电极间距对熔体电磁场均匀性具有较大影响;随着脉冲电流的脉宽减小,熔体上部的电磁场增强,但集肤深度也越小,同时作用时间缩短。
The effect of electric current pulse on the solidified microstructure of ferrite stainless steel was investiga ted. The results show that microstructure is considerably refined to equiaxed grains, and the average grain size is also decreased dramatically. 3D finite element model was developed to simulate the electromagnetic filed in the molten metal, especially considering the skin effect. The distribution of electric field, magnetic filed and electromagnetic force was calculated using ANSYS software. The results show that electromagnetic field is mainly distributed around the electrodes and on the top of the melt, and the direction of electromagnetic field is greatly changed in the later period of pulse width because of the eddy current. The distance between electrodes has more influence on the uniformity of electromagnetic field. With the decrease of pulse width, the skin effect become more seriously, but the duration time is shortened.
参考文献
| [1] | LI Qiu-shu;SONG Chang-jiang;ZHAI Qi jie .Effect of Pulsed Magnetic Field on Microstructure of 1Cr18Ni9Ti Aus tenitic Stainless Steel[J].Materials Science and Engineer ing,2007,466A:101. |
| [2] | Kolesnichen A F;Podoltsev A D;Kucheryav I N .Action of Pulse Magnetic Field on Molten Metal[J].ISIJ International,1994,34(09):715. |
| [3] | MA Xiao-ping;YANG Yuan-sheng;WANG Bin .Effect of Pulsed Magnetic Field on Superalloy Melt[J].International Journal of Heat and Mass Transfer,2009,52:5285. |
| [4] | 王冰,王建中,曹丽云,齐锦刚,苍大强.电脉冲孕育处理对Al-5%Cu-0.8%Mn合金组织及性能的影响[J].北京科技大学学报,2008(04):396-399. |
| [5] | 唐勇,王建中,苍大强.电脉冲对高碳钢凝固组织的影响[J].钢铁研究学报,1999(04):44-47. |
| [6] | Nakada Masayuki;Shiohara Yuh;Fleming M C .Modification of Solidification Structure by Pulse Electric Discharging[J].ISIJ International,1990,30(01):27. |
| [7] | 鄢红春;何冠虎;周本濂 等.脉冲电流对Sn-Ph合金凝固组织的影响[J].金属学报,1997,33(04):352. |
| [8] | LIAO Xi liang;ZHAI Qi-jie;CHEN Wen jie et al.Refining Mechanism of the Electric Current Pulse on the Solidification Structure of Pure Aluminum[J].Acta Materialia,2007,55:3103. |
| [9] | LI Jie;MA Jian-hong;GAO Yu-lai et al.Research on Solid fication Structure Refinement of Pure Aluminum by Electric Current Pulse With Parallel Electrodes[J].Materials Science and Engineering,2008,490A(1/2):452. |
| [10] | 王海川,张旺胜,廖直友,闵常杰,王世俊,董元篪.脉冲电场处理对钢的凝固组织和元素分布的影响[J].北京科技大学学报,2007(08):793-797. |
| [11] | MA Jian-hong;LI Jie;GAO Yu-lai et al.Improving the Carbon Maerosegregation in High-Carbon Steel by an Elec- tric Current Pulse[J].Metals and Materials International,2009,15(04):603. |
| [12] | Kenneth C. MILLS;Yuchu SU;Zushu LI .Equations for the calculation of the thermo-physical properties of stainless steel[J].ISIJ International,2004(10):1661-1668. |
| [13] | 张惠娟;杨文荣;李玲玲.工程电磁场与电磁波基础[M].北京:机械工业出版社,2009 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%