Condition and criterion for TiC particles getting into molten steel
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摘要: 通过泡沫载体的引载作用实现TiC增强颗粒混入钢液，在液态模锻工艺条件下成型20%TiC/铸钢（ZG270-500）制件。计算分析了泡沫载体消失气化时TiC增强颗粒在气隙中的运动行为及其进入钢液的条件。实验结果表明，TiC增强颗粒的运动速度随浇注温度、充型速度和排气孔口与型腔横截面积比的增大而递增。当钢液前沿TiC颗粒的运动速度大于临界速度时才能进入钢液，且TiC增强颗粒运动速度越大，越容易进入钢液，分布越均匀。Abstract: The composites of 20%TiC/ZG270-500 were made by means of squeeze casting, and it's realizable for TiC particles getting into molten steel with the action of foam carrier. Then TiC particles motion behaviors in air gap and conditions for TiC particles getting into molten steel were investigated during the gasification and extinction of foam carrier. The experimental results show that TiC particle motion velocity increases with the increase of pouring temperature, filling velocity and cross-section ratio of exhaust orifice to metal cavity. There is a critical velocity that the TiC particle should exceed for getting into molten steel. The greater of TiC particle motion velocity, the easier for them getting into molten steel, and the more uniform distribution of TiC particles in steel matrix.
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Keywords:
- TiC particles /
- squeeze casting /
- motion behavior /
- critical velocity /
- particle distribution
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