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研究了中碳钢钢液在凝固初期施加机械搅拌,改变搅拌参数对钢液凝固组织的影响。实验结果表明,随着搅拌时间的延长等轴晶比例增大,搅拌时间30 s时,等轴晶比例最大为50.784%;改变插入钢液深度,随着插入液面深度的增加,等轴晶区比例明显增大,同时晶粒得到细化,分布更均匀,插入深度为4.5 cm时,等轴晶比例和晶粒细化程度达到最优为30.866%;改变不同的搅拌速度时发现,搅拌速度越慢,等轴晶比例越大,搅拌速度为540 r/min时,试样凝固组织最好,等轴晶比例为50.784%。实验得到最优组合为搅拌时间30 s,插入深度4.5 cm,搅拌速度540 r/min,最优组合下得到的凝固组织等轴晶比例提高到62.618%。
The effects of stirring parameters on the solidification structure of molten steel were studied when medium carbon steel liquid was applied in the initial stage of solidification. The experimental results show that the proportion of equiaxed grains increases with the stirring time, and the maximum equiaxed grain ratio is 50.784% when the stirring time is 30 s. By changing the depth of molten steel, the equiaxed grains The proportion of grains increases obviously and the grains are refined and the distribution is more uniform. When the insertion depth is 4.5 cm, the equiaxed grain proportion and the degree of grain refinement are optimized to be 30.866%; when the different stirring speed is changed, it is found that stirring The slower the rate, the greater the equiaxed ratio is. When the stirring speed is 540 r / min, the solidified microstructure is the best and the equiaxed ratio is 50.784%. The best combination of experiments was 30 s stirring time, 4.5 cm insertion depth and 540 r / min stirring speed. The proportion of equiaxed solidified tissue obtained by optimal combination increased to 62.618%.