为了深入研究螺旋磁场解决重力偏析的效果及作用机理,本文选用低熔点Sn-Sb合金,分析不同励磁电流下螺旋磁场对铸锭宏观成分偏析的影响,并与常规条件下及相同工艺参数旋转磁场条件下的凝固组织进行比较.结果表明,螺旋磁场的电磁力分布特点有利于在铸锭内部形成更大区域的均匀搅拌,相比于旋转磁场可以更好地改善铸锭成分的宏观偏析;随着励磁电流的增大,两种磁场改善偏析、细化凝固组织的效果更好;当螺旋磁场励磁电流为100 A时,基本消除铸锭上、下部位由于重力作用导致的成分偏差,β相（SnSb）变得细小且均匀分布在基体内.在金属熔体凝固的过程中施加螺旋磁场可消除重力偏析,效果优于旋转磁场.
To study the mechanism of spiral magnetic field and the effect of gravity segregation, low-melting Sn- Sb alloy was selected in this paper to analyze the effects of spiral magnetic field （SMF） on macrosegregation of the ingot at different excitation currents, and these effects were also compared with the effects of conventional condition and rotating magnetic field （RMF） at the same stirring parameters. The experimental results show that the distribution of spiral magnetic field＇ s （SMF） electromagnetic force is more beneficial to form a well stir in a bigger zone which is more effective to improve the macrosegregation of the ingot thanthe RMF dose with the same excitation current. A higher excitation current can lead to a more refined solidified structure with lower component segregation for both RMF and SMF. Component difference between the upper and lower part of the ingot due to the gravity is substantially eliminated when the current of RMF is 100 A, and a more refined and irregular primary-precipitated β （SnSb） phase which inlays the matrix structure uniformly will be ob- tained, while the RMF can＇ t eliminate the segregation totally and the overall effects are worse than those of the SMF.
参考文献
| [1] | 宋宝来,程桃祖.轻压下技术压下量对钢偏析的影响[J].铸造技术,2009(05):678-681. |
| [2] | 吴明全,周书才.电磁搅拌对不锈钢铸坯质量的影响研究[J].铸造技术,2009(09):1120-1124. |
| [3] | K. S. OH;Y. W. CHANG .Macrosegregation behavior in continuously cast high carbon steel blooms and billets at the final stage of solidification in combination stirring[J].ISIJ International,1995(7):866-875. |
| [4] | Hideaki YAMAMURA;Takehiko TOH;Hiroshi HARADA .Optimum Magnetic Flux Density in Quality Control of Casts with Level DC Magnetic Field in Continuous Casting Mold[J].ISIJ International,2001(10):1229-1235. |
| [5] | ZHANG Qi,WANG Tong-min,LI Ting-ju,JIN Jun-ze.Numerical simulation of solidification process of Sn-3.5%Pb hollow billet with stirring magnetic field[J].中国有色金属学会会刊（英文版）,2007(05):940-946. |
| [6] | 左玉波,崔建忠,赵志浩,王向杰,朱庆丰,屈福,涂赣峰.电磁搅拌和细化剂对Al-Mg-Mn合金组织的影响[J].特种铸造及有色合金,2008(08):581-583. |
| [7] | 赵倩,房灿峰,侯晓光,韩彦博,张楠,张兴国.螺旋磁场对金属凝固过程中成分偏析的影响[J].特种铸造及有色合金,2011(06):495-500. |
| [8] | XU Guangji,WANG Zhihua,YIN Jianjun,DING Yutian,KOU Shengzhong.Effect of Rectangle Wave Pulse Current on Solidification Structure of ZA27 Alloy[J].武汉理工大学学报（材料科学版）英,2006(01):80-83. |
| [9] | 张琦,金俊泽,王同敏,李廷举,郭庆涛.金属液在旋转电磁搅拌器作用下的流动分析[J].中国有色金属学报,2007(01):98-104. |
| [10] | 齐雅丽,贾光霖,张国志.电磁搅拌对液态金属运动及凝固组织的影响[J].铸造技术,2005(02):118-120. |
| [11] | 王红霞,许春香,徐林,梁伟,韩富银.旋转磁场对Pb-Sn-Sb合金组织及性能的影响[J].材料科学与工艺,2009(01):70-74. |
| [12] | 王晓东,李廷举,金俊泽,赵恂,熊德赣,姜冀湘.磁力搅拌法的研究与开发[J].材料科学与工艺,2000(04):1-5. |
| [13] | 陈莉娟,李永晖,陶淑芬.电磁搅拌对铝铜合金宏观组织及偏析的影响[J].热加工工艺,2010(07):69-71. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%