研究了铅黄铜在无磁场、低频交变电磁场下水平连铸得到的铸坯横截面宏观组织、微观组织形貌及合金元素Pb的分布,并对其机理进行了分析。试验结果表明,在铅黄铜水平连铸的过程中施加低频交变电磁场能有效地细化晶粒及影响合金元素在横截面上的分布,并且电磁场有效地抑制了在常规水平连铸过程中出现的铸坯横截面上中下部位组织分布不均匀的现象。表现在铸坯横截面的凝固组织由上方主要为细小柱状晶、下方为粗大柱状晶变为均为细小的等轴晶,铸锭上部凝固滞后的现象消除;合金元素Pb的宏观偏析得到抑制,并且电流为30Hz、100A的组织优于30Hz、80A的组织。
The macrostructure,microstructure and distribution of Pb element of horizontal continuously cast billets of lead brass were investigated,which was solidified under the actions of no electromagnetic field and with electromagnetic field,separately,and theoretically interpreted.Experimental results show that the structure of lead brass is refined effectively and distribution of Pb element is affected with the application of electromagnetic field during horizontal continuous casting,what,s more,the phenomenon that the uneven distribution of structure over the cross-section of the traditional horizontal continuous casting is suppressed,that is,the solidification structure of the top mainly being small columnar crystal,the bottom being coarse columnar grains changes to all of fine equiaxial ones.When the electromagnetic field is added,the solidification lag of ingot,s upper is eliminated;the macro-segregation of Pb element is suppressed,and the solidification structure of 30Hz,100A is better than that of 30Hz,80A.
参考文献
| [1] | 朱权利,刘楷周,吴维冬,刘太权,陈维平.新型无铅黄铜的耐蚀性能研究[J].新技术新工艺,2009(06):84-86. |
| [2] | 许传凯,胡振青,黄劲松,章四琪,周忠诚,袁志伟,杜丹,黄湘.无铅易切削黄铜的研究进展[J].有色金属加工,2009(06):11-12,15. |
| [3] | 李新涛,李廷举,张兴国,周文龙,殷国茂,谭建昌,郑龙,宋蕊丽,高林汉.BFe30-1-1铜合金空心管坯水平连铸探索[J].稀有金属材料与工程,2006(11):1806-1808. |
| [4] | CAO Zhi-qiang;JIN Jun-ze;HAO Hai .Microstructures of electromagnetic casting and direct chill casting LY12 aluminum alloys[J].Transactions of Nonferrous Metals Society of China,2003(2):348-352. |
| [5] | Zhu Shoujun;Ren Zhongming;Deng Kang;Jiang Guochang .NUMERICAL SIMULATION OF ALTERNATIVE HORIZONTAL LEVITATION ELECTROMAGNETIC CONTINUOUS CASTING( Ⅱ )[J].Transactions of Nonferrous Metals Society of China,1996(4):42-46. |
| [6] | 张勤,崔建忠.7075铝合金CREM法半连铸坯中溶质元素的宏观分布[J].金属学报,2003(12):1264-1268. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%