摘要
利用热模拟装置进行了不同过热度及结晶器电磁搅拌(mould electromagnetic stirring,M-EMS)参数下GCr15轴承钢的连铸试验,以研究过热度及M-EMS耦合作用对铸锭凝固组织和偏析的影响。结果表明:随着过热度的降低及搅拌电流的增大,铸锭的等轴晶率(EGR)提高,混晶率(MGR)降低。弱电磁搅拌及低过热度时,铸锭中心碳偏析严重。随着过热度的提高及搅拌电流的增大,碳元素的最大偏析比及偏析比极差均先减小后增大。根据试验结果,GCr15轴承钢最优的电磁连铸工艺参数为:过热度44℃,电磁搅拌电流和频率分别为300 A和5 Hz。
In order to study the effects of both superheat degree and mould electromagnetic stirring(M-EMS)coupling on solidification structure and segregation of the ingot,continuous casting test of GCr15 bearing steel with different superheat degrees and mould electromagnetic stirring(M-EMS)parameters were carried out by using a thermal simulation device.The results showed that with the decrease of superheat temperature and the increase of stirring current,the equiaxed crystal ratio(EGR)of the ingot increased,while the mixed crystal ratio(MGR)decreased.In addition,the lower superheat degree and the lower stirring current led to a severe central carbon segregation in the ingot.With the increase of the superheat temperature and the stirring current,the maximum and range of segregation ratio of carbon element decreased at first and then increased.Based on the experimental results,the optimal technological parameters for continuous casting of GCr15 steel were superheat temperature of 44℃,stirring current of 300 A and frequency of 5 Hz.
作者
王瑞
蒋丹青
吴生沪
朱龙强
李传军
任忠鸣
WANG Rui;JIANG Danqing;WU Shenghu;ZHU Longqiang;LI Chuanjun;REN Zhongming(School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;State Key Laboratory of Advanced Special Steel, Shanghai 200444,China;Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai 200444, China)
出处
《上海金属》
CAS
2021年第2期85-91,98,共8页
Shanghai Metals
基金
国家自然科学基金(No.51701112)
上海市人才计划(18PJ1403700,19YF1415900)。
关键词
GCR15轴承钢
过热度
结晶器电磁搅拌
凝固组织
宏观偏析
GCr15 bearing steel
superheat degree
mould electromagnetic stirring
solidification structure
macro-segregation
