基于M-EMS工艺优化的齿轮钢偏析及淬透性带宽控制  

Control of segregation and hardenability band width by optimizing M-EMS parameters for gear steel

作　　者：孙海波 李烈军[2] 吴学兴 叶德新 SUN Hai-bo;LI Lie-jun;WU Xue-xing;YE De-xin(School of Materials Science and Energy Engineering,Foshan University,Foshan 528000,Guangdong,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;Manufacturing Department,Guangdong Shaoguan Iron and Steel Co.,Ltd.,Shaoguan 512123,Guangdong,China)

机构地区：[1]佛山科学技术学院材料科学与能源工程学院,广东佛山528000 [2]华南理工大学机械与汽车工程学院,广东广州510640 [3]宝武集团广东韶关钢铁有限公司制造部,广东韶关512123

出　　处：《钢铁》2018年第8期55-61,共7页Iron and Steel

基　　金：国家自然科学基金资助项目(51704078);广东省自然科学基金资助项目(2017A030313312)

摘　　要：为提高齿轮钢产品淬透性带宽的可控性,基于数值模拟和工业试验,对比研究了连铸结晶器电磁搅拌（M-EMS）工艺参数对齿轮钢成分均匀性及其淬透性带宽的影响规律。结果表明,随着M-EMS工作电流由100增至600 A,结晶器出口中心处钢液过热度约由0.25降至-2.65℃,铸坯皮下12 mm处碳偏析度由0.98降至0.85。在质量守恒和结晶器内过热耗散的综合作用下,齿轮钢轧材横截面上碳质量分数极差值随M-EMS工作电流的增加呈先降低后增加的趋势,其中M-EMS工作电流为200 A时达到最低值,约为0.012%。与600 A/2.5 Hz工况相比,MEMS工艺参数为200 A/2.5 Hz时,齿轮钢末端淬透性带宽得到有效控制,可由之前最大的10HRC降至5HRC以内。To improve the controllability of hardenability band width for gear steel products,the parameters dependence of in-mould electromagnetic stirring（M-EMS） on the component homogeneity and hardenability band width has been investigated based on the numerical simulation and plant trials. It was seen that superheat degree of liquid steel at the center of mould exit was reduced from 0.25 to-2.65 ℃,and the carbon segregation at 12 mm from strand surface decreased from 0.98 to 0.85 as the stirrer current increased from 100 to 600 A. The fluctuation range of carbon content on the cross section of roller gear steel product was firstly reduced and then increased with the increase of running current due to the integrated effects of superheat dissipation and concentration equilibrium in mold region with EMS,where the minimum fluctuation rate of 0.012% was presented under the stirrer current of 200 A. The magnitude of hardenability band could be decreased from 10 HRC（max）to that less than 5 HRC under the optimized M-EMS parameters of 200 A/2.5 Hz,as compared to normal case of 600 A/2.5 Hz,which was beneficial to effective control for hardenability band width.

关 键 词：连铸 齿轮钢 结晶器电磁搅拌 偏析 淬透性带宽 

分 类 号：TF777[冶金工程—钢铁冶金]