ABSTRACT Make use of the positive thixotropic characteristic which decrease wall viscous force and increasing fluidity of molten steel in mushy zone by sustained shear force acting on mushy zone. In the test, the billet surface is continuously struck by 20 Hz frequency external force at the position of 20–30% linear proportion of liquid core. The results show that with vibration strike, the central porosity is obviously reduced and shrinkage cavity has been eliminated almost totally, the central carbon segregation didn’t solve. In-situ analysis shows that the uniformity of carbon content distribution in the centre of vibration strike billet is better than that of non- vibration strike billet, and the central density of vibration strike billet is higher than that of non-vibration strike billet.

中文翻译：

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外振冲击改善钢坯中心缺陷的研究

摘要 利用正触变特性，通过作用于糊状区的持续剪切力，降低糊状区钢水的壁面粘滞力，增加其流动性。试验中，钢坯表面在液芯线性比例为20%～30%的位置连续受到20Hz频率的外力冲击。结果表明，随着振动冲击，中心气孔率明显降低，缩孔几乎完全消除，中心碳偏析没有得到解决。原位分析表明，振动冲击坯中心碳含量分布的均匀性优于非振动冲击坯，振动冲击坯的中心密度高于非振动冲击坯。