|About this Abstract
||Liquid Metal Processing & Casting Conference (LMPC 2019)
||Liquid Metal Processing & Casting
||Mechanism of Metallurgical Quality Improvement of Ingot Processed by Vacuum Electroslag Remelting
||Yu Liu, Guangqiang Li, Xuechi Huang, Yulong Cao, Qiang Wang, Baokuan Li
|On-Site Speaker (Planned)
To clarify the role of vacuum on cleanliness improvement and structural evolution of H13 ingot processed by electroslag remelting (ESR), two heats were carried out under Ar atmosphere and vacuum, respectively. The results show that the total oxygen contents in ingots remelted under Ar atmosphere and vacuum are 38 ppm and 16 ppm, respectively. The inclusions in two ingots are both (Ti,V)N, CaO-Al2O3-MgO and CaO-Al2O3 oxide covered by (Ti,V)N. The inclusions are predominantly (Ti,V)N, and the size are finer in ingot processed by ESR under vacuum. The remelting rate is more rapid under vacuum because the fluoride vaporization becomes severer, resulting in that the electric resistance of slag melts increases. Meanwhile, the fluoride vaporization also strengthens flows in slag melts, contributing to the more uniform temperature distribution in slag melts. As a result, the secondary dendrite arm-spacing (SDAS) and the sizes of carbides are smaller in ingots remelted under vacuum.
||Definite: At-meeting proceedings