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用实验与模拟计算相结合的方法研究了水冷条件下430铁素体不锈钢的温度场分布、流场分布及凝固组织。水冷条件下,铸件的凝固组织几乎都是等轴晶,当顶部的传热系数h=100 W/(m2·K),四周和底部的传热系数h=2000 W/(m2·K)时,模拟计算的凝固组织与实验得到的组织基本一致。采用CAFE模块对水冷条件下铁素体不锈钢凝固过程的温度场和流场进行分析,得到铸件底部凝固前沿和液相线前沿温度梯度最大分别为6.75 K/mm和7.15 K/mm,从侧壁到中心,液相线前沿和凝固前沿的温度梯度逐渐降低;铸件底部到顶部固液两相区的宽度逐渐增加然后减小,固液两相区内流体流动速率逐渐降低,在底部达到最大值4.23 mm/s;液相线前沿流体流动速率呈逐渐增大的趋势,平均值为2.40 mm/s。
The temperature field distribution, flow field distribution and solidification structure of 430 ferritic stainless steel under water cooling conditions were studied by means of experiment and simulation calculation. Under the condition of water cooling, the solidified structure of castings is almost equiaxed. When the heat transfer coefficient h = 100 W / (m2 · K) at the top and the heat transfer coefficient h = 2000 W / (m2 · K) at the periphery and bottom, The simulated solidified tissue is basically the same as the experimental one. The temperature field and flow field of ferritic stainless steel under water cooling condition were analyzed by CAFE module. The maximum temperature gradient at the front of the solidification front and the liquidus at the bottom of the casting were 6.75 K / mm and 7.15 K / mm respectively, To the center, the temperature gradient of liquidus front and solidification front gradually decreased; the width of solid-liquid two-phase zone from bottom to top of castings gradually increased and then decreased, and the fluid flow rate in solid-liquid two-phase zone decreased gradually and reached the maximum at the bottom 4.23 mm / s. The fluid flow rate at the leading edge of the liquidus gradually increases with an average value of 2.40 mm / s.