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以凝固过程的溶质微观偏析理论为基础,通过实际测试和理论分析计算相结合,系统的研究了连铸条件下SS400和65Mn两钢种的高温热力学特性。研究表明:钢种两相区宽度对其相应的等效导热系数、等效比热2个热学参数和泊松比起决定作用;通过铸态组织的高温拉伸试验测试结果可拟合得到相应钢种杨氏模量与温度的关系曲线;对于连铸而言,凝固过程中的粘滞性温度和固态组织类型决定了热膨胀系数的大小,65Mn钢凝固过程中直接生成γ奥氏体,因此热膨胀系数的峰值较SS400钢要大,达到0.000 36/℃。
Based on the theory of solute microsegregation in the solidification process, the high temperature thermodynamic properties of SS400 and 65Mn steel under continuous casting were systematically studied through the combination of actual testing and theoretical analysis and calculation. The results show that the width of the two-phase zone of steel plays a decisive role in the corresponding equivalent thermal conductivity, the two thermal parameters of equivalent specific heat and the Poisson’s ratio. The high temperature tensile test results of the as-cast microstructure can be fitted to the corresponding steel For the continuous casting, the viscosity temperature and the type of solid tissue in the solidification process determine the size of the thermal expansion coefficient. The γ-austenite is directly generated during the solidification of 65Mn steel, so the thermal expansion The peak of the coefficient is larger than SS400 steel, reaching 0.000 36 / ℃.