摘要
基于弯月面渣道压力计算,分析2.0 m/min高拉速下板坯连铸结晶器振动周期内初凝坯壳变形行为,提出新的液态渣消耗机制,并定义了渣耗时间和渣耗强度的概念,阐明了结晶器非正弦振动参数对液态渣渣耗量影响规律.研究表明:渣道宽度变化引起渣道压力改变导致液态渣周期性持续消耗,振动正滑脱末期至负滑脱末期渣道负压抽吸液态渣进入渣道;降低振频延长了液态渣渣耗时间,但使渣耗强度削弱:提高振幅可加大渣耗强度,对渣耗时间影响很小;非正弦振动因子对渣耗强度影响较小,渣耗时间随非正弦振动因子减小而增大.
Liquid flux is an effective lubrication in the conventional continuous casting of steel, which can prevent the breakout effectively, and also the longitudinal cracks that occur on strand surface are decreased obviously. Previously, many studies have been reported on the flux infiltration, some empirical equations for calculating flux consumption have been reported based on the data accumulated through the commercial operation of casters, and the new tools and techniques for estimating the lubrication condition in mold have also been introduced. Especially, the lubrication mechanism of liquid flux has drawn general concerns recently, and some relevant simulation of flux infiltration behavior based on the cold model experiments and mathematical models of flux infiltration derived from theoretical calculations have been conducted. Most of these researches lay particular emphasis on the macroscopical detection and calculation to the infiltration behavior, and some researches related to micro-mechanism lack the discussion of the relevant influence factor yet. In the present work, on the basis of calculation of liquid flux channel pressure in meniscus for slab continuous casting mold, a new mechanism of the liquid flux consumption was proposed by analyzing the deformation behavior of initial solidifying shell during the mold oscillation cycle as high casting speed 2.0 m/min, and the concepts of infiltration time and infiltration intensity were defined for the first time, then the effect of non-sinusoidal oscillation parameters on the liquid flux consumption was discussed. The results show that the periodically continued liquid flux consumption is caused by variety of flux channel pressure which is induced by change of channel width, and the liquid flux will be infiltrated into flux channel from last stage of positive strip time until last stage of negative strip time by negative flux channel pressure.The infiltration time is lengthened and the infiltration intensity is weakened by reducing oscillation frequency. The in
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第4期485-489,共5页
Acta Metallurgica Sinica
基金
国家高技术研究发展计划项目2005AA331020
新世纪优秀人才支持计划项目NCET-04-0285
中国博士后科学基金项目20080441090
东北大学博士后科研基金项目20080306~~
关键词
连铸结晶器
高拉速
非正弦振动
液态渣消耗
continuous casting mold, high casting speed, non sinusoidal oscillation, liquid flux consumption
