长水口热机械应力研究

Research on thermomechanical stress of shroud

长水口是实现钢水无氧化浇注的重要元件 ,在使用过程中常常因为热机械应力过大而损坏。运用有限单元法 ,模拟长水口在工作状态下的热应力场 ,研究了热冲击时间、预热温度以及材料的热导率对热应力的影响。计算结果表明 :热冲击时间的长短不影响应力峰值的大小 ;提高预热温度可以降低应力峰值 ;不同的热导率不会改变应力峰值的大小 ,只会改变应力的变化快慢。

Shroud is an important component for non-oxidation casting of steel.Thermomechanical stress is a major cause that results in its damage.In this paper,its stress field under working conditions was simulated at the same time,the effects of time of thermal shock,preheat temperature and thermal conductivity of refractory were researched.Calculation results indicate:time of thermal shock does not affect the stress peak;increasing preheat temperature can decrease the stress peak;different thermal conductivity of refractory can not change the value of stress peak but can change the rate of variation of stresses.