Study of basicity impact on mold flux crystallization and radiative heat transfer in continuous casting
This paper first investigated the temperature time transformation (TTT) diagrams and continuous cooling transformation (CCT) diagrams of mold fluxes with different basicity by using single hot thermocouple technology (SHTT). Results showed that: with the increase of basicity, the incubation time of isothermal crystallization became shorter; the crystallization temperature was getting higher; and the critical cooling rate of continuous cooling crystallization became faster. The X-ray diffraction analysis suggested that calcium silicate (CaO·SiO2) was precipitated at the upper part of the TTT diagram and cuspidine (Ca4Si2O7F2) was formed at the lower part, when the basicity of mold fluxes was within 1.0-1.2. Kinetic study indicated that the increase of the basicity tended to enhance the mold flux crystallization, and the crystallization mechanism of cupsidine was changing from one-dimensional growth to three-dimensional growth with a constant number of nuclei, when the basicity of mold fluxes varied from 0.8 to 1.2. By using an infrared radiation emitter, a radiative heat flux was applied to a copper mold covered with solid mold flux disk to simulate the heat transfer phenomena in continuous casting. The crystallization behaviors of mold fluxes with different basicity and their impact on the radiative heat transfer were investigated dynamically. The results suggested that the basicity tends to enhance mold flux crystallization, leading to the reduction of radiative heat transfer rate and improvement of interfacial thermal resistance.
Mold flux TTT and CCT radiative heat transfer crystallization basicity
Wanlin WANG Lejun ZHOU Kezhuan GU Fanjun MA
School of Metallurgical Science and Engineering, Central South University Changsha, 410083, China
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-15
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）