|
|
|
| Effect of SiO2 and B2O3 on crystallization and structure of CaF2–CaO–Al2O3-based slag for electroslag remelting of ultra-supercritical rotor steel |
| Yi Huang1, Cheng-bin Shi1, Xiu-xiu Wan1, Jiang-ling Li2, Ding-li Zheng3, Jing Li1 |
1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
2 College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
3 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China |
|
|
|
|
Abstract Regarding development of the dedicated slag for electroslag remelting, crystallization characteristics of the slag exert a strong influence on the initial solidification of liquid metal in mold and surface quality of as-cast ingot. The crystallization behavior of CaF2–CaO–Al2O3-based slag with varying SiO2 and B2O3 contents and their correlation with the slag structure were investigated. Increasing SiO2 (0.24–8.95 mass%) and B2O3 (0–3.20 mass%) contents lowers the crystallization temperature and suppresses the crystallization of the slag melts, as well as decreases the sizes of the crystalline phases. The crystalline phases precipitated during continuous cooling of the slag melts are faceted 11CaO·7Al2O3·CaF2, faceted or spherical CaF2, and non-faceted MgO·Al2O3 (or MgO) in sequence irrespective of the SiO2 and B2O3 contents of the slag. The polymerization degree of slag melts increases with increasing either SiO2 or B2O3 contents. The crystallization of the slag melts is increasingly retarded with increasing the SiO2 and B2O3 contents of the slag caused by increased component diffusion resistance originating from increased polymerization degree of the slag melts.
|
|
Received: 09 July 2021
Published: 25 December 2021
|
|
|
|
| Cite this article: |
|
Yi Huang,Cheng-bin Shi,Xiu-xiu Wan, et al. Effect of SiO2 and B2O3 on crystallization and structure of CaF2–CaO–Al2O3-based slag for electroslag remelting of ultra-supercritical rotor steel[J]. Journal of Iron and Steel Research International, 2021, 28(12): 1530-1540.
|
|
|
|
| [1] |
LI Zhen-tuan, QIN He-yong, TIAN Qiang, ZHANG Wen-yun, ZHAO Guang-pu. Effect of deformation parameters on dynamic recrystallization and γ′-phase of GH4742 superalloy[J]. Iron and Steel, 2022, 57(2): 117-126. |
| [2] |
DENG Yong, YANG Li-bin, WANG Cheng-yi. Application of high-speed continuous casting technology for low carbon steel slab in Masteel[J]. CONTINUOUS CASTING, 2022, 47(1): 72-77. |
| [3] |
LIU Wen-xiang, REN Lei. Influence of outlet angle for submerged entry nozzle on fluid flow in a wide slab casting mold[J]. Iron and Steel, 2022, 57(1): 83-92. |
| [4] |
PAN Wei-jie, LI Min, ZHU Li-long, HE Sheng-ping. Effect of Na2O on properties of ultra-high basicity continuous casting mold fluxes[J]. Iron and Steel, 2022, 57(1): 93-101. |
| [5] |
WANG Li-guang, WANG Shu-huan, DUAN Yang-hui, LI Jie, FENG Yun-li. Effect of Nb on primary recrystallization behavior of low temperature grain-oriented silicon steel[J]. Iron and Steel, 2022, 57(1): 119-125. |
| [6] |
SHEN Zhongmin1,2， GUO Jing1,2， DUAN Shengchao1,2，GUO Hanjie1,2， DUAN Ran3， LI Lianpeng4. Thermodynamic model for Al and Ti burning control of GH4706 large size electroslag ingot[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2021, 33(9): 901-910. |
|
|
|
|
2021, Vol. 28 
