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目前,在EAFCSP流程中通过VN微合金化技术可成功生产屈服强度为550 MPa的高强度低合金钢。然而,基于热力学平衡考虑,对铸坯中V(C,N)的析出分析存在争议。针对珠钢CSP流程生产的VN微合金钢,采用物理化学相分析方法、透射电镜的复型分析以及扫描电镜观察了流程中不同阶段试样的V(C,N)析出情况。并通过ThermoCalc 理论计算,初步探讨了EAFCSP流程VN微合金钢中Ti以及Al的析出对V(C,N)析出的影响。

The VN microalloy steel with yield strength of 550 MPa is produced by EAFCSP route. However, based on the thermodynamics, there are different opinious regarding the analysis of V(C,N) particles in the waterquenched continuously cast slab.The physicochemical phase analysis,SEM and TEM analysis were used to observe the precipitates during EAFCSP process.The effect of Ti and Al on the precipitation of V(C,N) is discussed by use of ThermoCalc software.

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