材料期刊网

为了减轻GCr15钢中的碳偏析，使其能更优的用于深冲领域，采用了铸坯横截面钻样的方法和枝晶形貌微观显形的方法研究了铸坯碳偏析的分布规律，采用大生产数据回归的方法研究了生产过程中连铸工艺参数对碳偏析指数的影响。结果表明：适当提高二冷强度可以有效改善碳分布均匀程度，铸坯截面对角线方向碳分布比纵横方向均匀；从铸坯表面到中心枝晶间距逐渐增大，中心部位最严重，而增大二冷强度有利于减弱枝晶偏析；回归分析表明偏析指数与二冷比水量的相关性最大，而与钢水过热度的相关性不强.

The distribution rules of carbon segregation on casting billet were investigated to reduce carbon segregation and improve its properties of deep drawing in steel GCr15, adopting the ways the section of casting billet was drilled and dendritic microstructure was showed. And the effect on carbon segregation index by casting parameters was studied through the regressive analysis of the data in producing process. The study indicates that the average degree of carbon distribution can be improved, when increasing secondary cooling intensity, and diagonal carbon distribution is more average than vertical and horizontal’s in section of GCr15 steel billet; The dendritic distance becomes more and more obvious from exterior to center in casting billet, and it’s especially serious in center, And it’s advantaged to weaken dendritic segregation that increasing secondary cooling intensity; Regressive analysis shows segregation index has maximal relationship with water ratio in secondary cooling, and has low relationship with superheat degree of steel.