真空自耗熔炼过程宏观偏析的数值模拟  

Numerical simulation of macrosegregation in vacuum arc remelting process

作　　者：王亚栋 张立峰 张健 周扬 刘庭耀 任英[1] WANG Yadong;ZHANG Lifeng;ZHANG Jian;ZHOU Yang;LIU Tingyao;REN Ying(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Lab of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China;Chengdu Advanced Metal Materials Industry Technology Research Institute Co.,Ltd.,Chengdu 610303,Sichuan,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066044 [3]成都先进金属材料产业技术研究院股份有限公司,四川成都610303

出　　处：《钢铁研究学报》2021年第8期718-725,共8页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(U1860206,51725402,51874031)。

摘　　要：基于国内某特钢厂真空自耗生产过程,利用ProCAST软件建立三维熔炼模型,研究了不同电流强度和熔速对铸锭熔池形状和宏观偏析的影响规律。铸锭侧面表层基本不发生宏观偏析,铸锭1/4处偏析度约为1.03的正偏析,铸锭中心处由于枝晶沉降形成偏析度为0.96的负偏析。电流强度从4 kA增加至8 kA,熔滴滴落温度增加,熔池深度加深,熔炼70%时熔池深度分别为64.6和77.4 mm。铸锭1/4处和顶部的宏观偏析逐渐加重,铸锭1/4处的偏析度从1.06增加至1.08,铸锭顶部的偏析度从1.07增加至1.13。电极熔速从0.8 kg/min增加至2.4 kg/min,熔池深度加深,熔炼70%时熔池深度分别为64.6和101.5 mm。铸锭顶部的偏析度从1.07增加至1.18。Based on the vacuum arc remelting process in a domestic special steel plant, a three-dimensional model was established by ProCAST software to investigate the effect of current intensity and melting rate on the shape of melting pool and macrosegregation. There is almost no macrosegregation near the side surface of the ingot. The degree of segregation is 1.03 near 1/4 of the ingot. Due to the grain settling, negative segregation is generated in the center of the ingot and the degree of segregation is 0.96. With the current intensity increasing from 4 kA to 8 kA, the temperature of droplets increases, and the depth of the molten pool increases. The depth of the molten pool is 64.6 mm and 77.4 mm, respectively when 70% of the ingot is filled. The macrosegregation increases gradually both at 1/4 of the ingot and the top of the ingot. The degree of segregation increased from 1.06 to 1.08 at 1/4 of the ingot, and the degree of segregation increases from 1.07 to 1.13 at the top of the ingot. With the melting rate increasing from 0.8 kg/min to 2.4 kg/min, the depth of the molten pool increases, and the depth of the molten pool is 64.6 mm and 101.5 mm respectively when 70% of the ingot is filled. The degree of segregation increases from 1.07 to 1.18 at the top of the ingot.

关 键 词：宏观偏析 真空自耗熔炼 数值模拟 电流强度 熔速 

分 类 号：TF762[冶金工程—钢铁冶金]