Effect of Slag on Inclusions During Electroslag Remelting Process of Die Steel
Effect of Slag on Inclusions During Electroslag Remelting Process of Die Steel
复制标题
电渣重熔模具钢过程中炉渣对夹杂物的影响
DOI：
10.1007/s11663-014-0070-7
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发表时间：
2014-08-01
影响因子：
3
通讯作者：
Hou, Dong
中科院分区：
文献类型：
--
作者：
Dong, Yan-Wu;Jiang, Zhou-Hua;Hou, Dong
影响电渣钢中非金属夹杂物含量的因素很多，包括炉内气氛和电渣中夹杂物的含量、炉渣量及其组成、输入功率、熔化速度、填充比等。含氟渣对非金属夹杂物的影响很大，已广泛应用于电渣重熔工艺。基于渣-金属界面和电渣重熔过程的相互作用，研究了含氟渣对电渣钢锭中夹杂物的影响。本文以CR-5A模具钢和几种炉渣为材料，在氩气环境下研究了炉渣对电阻炉中夹杂物的影响，以消除环境氧的影响。在不同时间采集样品，分析非金属夹杂物的含量、尺寸和类型。定量金相分析结果表明，多组分渣具有较好的夹杂物控制能力；特别采用了保护气体气氛。电渣钢中夹杂物的SEM-EDS分析结果表明，对于多组分渣，电渣钢中非金属夹杂物主要为MgO-Al2O3夹杂物，而使用70 wt % CaF2-30 wt % Al2O3渣重熔时，非金属夹杂物主要为Al2O3夹杂物。多组分渣的最大夹杂物尺寸小于常规二元渣。较小的填充比和保护气体气氛有利于控制电渣钢中非金属夹杂物。所得结果将与钢中原始夹杂物进行比较，为电渣重熔渣的选择提供依据。(C)矿物、金属与材料协会和ASM International 2014
Many factors influence the non-metallic inclusions in electroslag steel including furnace atmosphere and inclusions' content in the consumable electrode, slag amount and its composition, power input, melting rate, filling ratio, and so on. Fluoride containing slag, which influences the non-metallic inclusions to a great extent, has been widely used for the electroslag remelting process. The current paper focuses on the effect of fluoride containing slag on the inclusions in electroslag ingots based on the interaction of the slag-metal interface and electroslag remelting process. In this work, die steel of CR-5A and several slags have been employed for investigating the effect of slag on inclusions in an electrical resistance furnace under argon atmosphere in order to eliminate the effect of ambient oxygen. Specimens were taken at different times for analyzing the content, dimensions, and type of non-metallic inclusions. Results of quantitative metallographic analysis indicate that a multi-component slag has better capacity for controlling the amount of inclusions; especially protective gas atmosphere has also been adopted. The findings of inclusions in electroslag steel by SEM-EDS analysis reveal that most non-metallic inclusions in electroslag steel are MgO-Al2O3 inclusions for multi-component slags, but it is Al2O3 inclusions when remelting using conventional 70 wt pct CaF2-30 wt pct Al2O3 slag. The maximal inclusions' size using multi-component slags is less than that using conventional binary slag. Small filling ratio as well as protective gas atmosphere is favorable for controlling the non-metallic inclusions in electroslag steel. All the results obtained will be compared to the original state inclusions in steel, which contribute to choice of slag for electroslag remelting. (C) The Minerals, Metals & Materials Society and ASM International 2014