连铸方坯热应力模型的研究及应用

为了减少不恰当连铸二冷操作导致的铸坯内部裂纹等缺陷,在凝固传热模型验证的基础上建立了方坯二维弹塑性应力模型.通过此模型计算了水量优化前后铸坯应力分布情况,获得了铸坯在二冷区的应力分布规律.分析了影响连铸坯内部裂纹的因素,提出预防热裂纹产生的措施,为研究二冷对铸坯质量的影响提供了理论基础,并为优化二冷水量改善铸坯质量提供了依据.

Research and Application on Thermal Stress Model of Billet Continuous Casting

To reduce the internal cracks and defects of billets, which were caused by the inappropriate secondary cooling operation during continuous casting, a 2-D thermal elastic-plastic stress model of billet was developed via the verification of the heat transfer model in solidification process. Then, the billet stress distribution was calculated before and after the optimization of water flowrate required for secondary cooling to find out the rules of billet stress distribution in the secondary cooling zone. Analyzing the influencing factors on the cracks in billet, some measures were proposed to prevent the billet from thermal cracks, thus providing theoretically foundation to study the effect of secondary cooling on the quality of billet and the way to optimize the water flowrate required for secondary cooling so as to improve the strand quality during continuous casting.