铝热反应制备纳米晶Fe_3Al过程中熔体冷却的温度场模拟

Temperature field simulation of melts in aluminothermic reaction for preparation of nanocrystalline Fe_3Al block

利用有限元分析软件ANSYS模拟铝热反应熔化制备块体纳米晶Fe3Al过程中熔体冷却的温度场,并通过实验对结果进行验证.结果表明:熔体主要通过Cu底材的热传导进行传热.沿高度方向,距Cu底材越近,Fe3Al熔体温度越低;0.5 s前距Cu底材越近,Fe3Al熔体冷却速度越大,0.5 s后其冷却速度趋于一致.距底材越远,Fe3Al熔体的过热时间越长,净化效果越好.沿径向,整个过程中Fe3Al熔体的温度、冷却速度基本相同.测温点处计算温度和实测温度的数值基本吻合,变化规律一致.

Making use of the finite element analysis software ANSYS,The temperature field distribution of the melts was calculated in aluminothermic process to prepare nanocrystalline Fe3Al.The calculated results were compared with the measured values.The results showed that,heat conduction of the Cu substrate was the main way of heat transfer.Along the height direction,the closer to the Cu substrate,the temperature of Fe3Al melt was lower;before 0.5 s,the closer to the Cu substrate,the cooling rate of Fe3Al melt was bigger,then the cooling rate became unchanged basically.The farther away from the substrate,the overheating time of Fe3Al melt was longer,and the melt purification was better.Along the radial direction,the temperature and cooling rate of Fe3Al melt were almost same.The calculated results were in good coincident with the measured results.