弯月面热障涂层方法对结晶器传热及铸坯振痕形貌的影响  

EFFECT OF THERMAL BARRIER COATINGS ABOVE MOULD MENISCUS ON MOULD HEAT TRANSFER AND OSCILLATION MARK MORPHOLOGY OF STRANDS

作　　者：侯晓光[1,2] 王恩刚[1] 许秀杰[1] 邓安元[1] 王万林[3] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,沈阳110819 [2]宝山钢铁股份有限公司,上海201900 [3]中南大学冶金与环境学院,长沙410083

出　　处：《金属学报》2015年第9期1145-1152,共8页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50834009和51474065;教育部重大科技项目311014;高等学校学科创新引智计划项目B07015资助~~

摘　　要：提出了一种在结晶器弯月面上方涂敷热障涂层,来抑制弯月面传热,进而控制铸坯振痕形成的新方法,称为弯月面热障涂层方法(TBCMM).利用模拟结晶器弯月面一维传热的测试装置,研究了热障涂层在结晶器弯月面的不同位置对传热的影响规律,分析了热障涂层抑制振痕形成的机理;在浸铸式连铸模拟机上,分别进行了结晶器有、无热障涂层的低熔点Sn-12.5%Pb合金的模拟连铸实验,获得了实测的弯月面温度波动曲线和铸坯,对比分析了弯月面热流和铸坯表面振痕形貌,证实了提出的TBCMM的有效性;最后,在中试实验连铸机上,研究了热障涂层对钢连铸坯表面质量的影响,获得了表面振痕减轻甚至消除的连铸钢坯.Oscillation marks are closely related to the surface quality of bloom. Excellent surface quality of bloom is essential assurance of the technology of continuous casting and rolling. The improvement of heat transfer process through mold is beneficial to alleviate oscillation marks. A new method of inhibiting formation of oscillation marks in continuous casting, namely spraying or embedding thermal barrier coatings above mold meniscus （TBCMM） was proposed, by which the temperature and heat flux fluctuation of meniscus was reduced, and then the surface quality of strands was improved. Using an one-dimensional heat transfer sinmlating apparatus, the effect of location of thermal barrier coatings on heat transfer near meniscus was investigated, and the possible mechanism of TBCMM on inhibiting formation of oscillation marks was also discussed. With a dip simulator for continuous casting, lower melt point Sn-12.5%Pb alloy was casted with thermal barrier coating （TBC） and without TBC molds respectively, and the temperature fluctuation was also measured. The heat flux near meniscus in mold and the oscillation marks morphology on strands confirm the effectiveness of the proposed TBCMM. Finally, in a pilot continuous caster, casting experiments of steel with TBCMM was conducted, and the oscillation marks on billet surface were alleviated or removed.

关 键 词：热障涂层 连铸 弯月面 振痕 

分 类 号：TF777[冶金工程—钢铁冶金]