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不同渣系及平衡时间对C-HRA-3合金元素烧损及夹杂物特征影响
Effects of Different Slag Systems and Equilibrium Time on the Element Burning Loss and Inclusion Characteristics of the C-HRA-3 Alloy
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- DOI:
- 作者:
- 李龙飞 1 ，林腾昌 1 ，何西扣 2 ，陈正宗 2 ，姚同路 1 ，孟华栋 1
LI Longfei1 , LIN Tengchang1 , HE Xikou2 , CHEN Zhengzong2 , YAO Tonglu1 , MENG Huadong1
- 作者单位:
- 1.钢铁研究总院有限公司 冶金工艺研究所，北京 100081；2.钢铁研究总院有限公司 特殊钢研究院，北京 100081
1. Department of Metallurgical Technology Research, Central Iron and Steel Research Institute, Beijing 100081, China; 2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China
- 关键词:
- C-HRA-3 合金；电渣重熔；渣金平衡；元素烧损；夹杂物
： C-HRA-3 alloy; electroslag remelting; slag-metal equilibrium; element burning loss; inclusion
- 摘要:
- 本文通过渣金平衡试验，借助冶金学原理、FactSage 热力学计算、扫描电镜观察等理论和方法，研究了 3 种
不同组元含量 CaF2-Al2O3-CaO-MgO-TiO2-ZrO2 六元渣系及 5 个不同渣金平衡时间(20、40、60、120、180 min)下 C-HRA-3
合金中元素含量及夹杂物特征的变化。 结果表明，渣金平衡试验后，C-HRA-3 合金中 Al、Ti、Zr 含量降低，Si 含量上升，
而 B 含量保持小范围波动。 预熔渣中 TiO2 和 ZrO2 含量增加，可明显减轻合金中 Ti、Zr 烧损，而 Al 含量变化较小。 当平
衡时间在 0~40 min 时，Al、Ti 含量分别降低了 14.29%和 20.59%，Zr 含量变化幅度最大，迅速降低了 54.55%；而平衡时
间超过 40 min 时，Al、Ti、Zr 含量在较低水平波动变化。 渣金平衡时间延长可使 C-HRA-3 合金中夹杂物数量减少，对夹
杂物平均直径及不同粒径数量比例影响不大，其类型主要为球形或近球形的 Al2O3 和 MgO 及棱角状 TiN 夹杂，且在凝
固过程易析出大尺寸一次碳化物。研究表明，在电渣重熔冶炼生产 C-HRA-3 合金的过程中应严格控制渣中 SiO2 等杂质
含量并适当添加 TiO2 和 ZrO2 组元，注意过程中 Al 含量的补加及冶炼保护气氛良好，提高电渣锭的冷却强度。
In this paper, the changes in element content and inclusion characteristics in C-HRA-3 alloy under three different 6-system slags, CaF2-Al2O3-CaO-MgO-TiO2-ZrO2, and five different slag-metal equilibrium times of 20~180 min were investigated by metallurgical principles, FactSage thermodynamic calculations and scanning electron microscopy. The results show that the contents of Al, Ti and Zr in the C-HRA-3 alloy decrease, while the content of Si increases, and the B content maintains a small range of fluctuations after the slag-metal equilibrium experiment. When the equilibrium reaction time is within 0~40 min, the contents of Al and Ti are 14.29% and 20.59%, respectively, lower than the original content, and the Zr content changes maximally and decreases by 54.55%. As the equilibrium time exceeds 40 min, the contents of Al, Ti and Zr fluctuate at a low level. The increase in equilibrium time can reduce the number of inclusions in the C-HRA-3 alloy and has little effect on the average diameter of inclusions and the proportion of different sizes. The inclusions mainly consist of spherical or near-spherical Al2O3 and MgO and TiN with edges and corners. Moreover, large primary carbides easily precipitate from the matrix during solidification. Through research and analysis, SiO2 and other impurities should be strictly controlled in the slag, and TiO2 and ZrO2 components should be properly added to the slag in the process of electroslag remelting of C-HRA-3 alloy. It is necessary to add Al into the metal bath, maintain a good smelting protective atmosphere and improve the cooling intensity of the electroslag ingot.