控轧过程中KQ450钢的晶粒细化和析出物行为

Grain Refinement and Precipitation Behavior in KQ450 Steels during Controlled Rolling

通过定量金相、扫描电镜、透射电镜和X射线小角度散射方法研究KQ450微合金钢在不同控制轧制条件下，工艺参数对其铁素体晶粒细化和析出物行为的影响．结果表明：加热温度对KQ450微合金钢晶粒粗化比较敏感；析出相是面心立方结构的NbC，VC和V（CN）．析出物的平均尺寸随冷却速度的增大而减小．

The effect of hot-working parameters on the ferrite grain refinement and Precipitation behaviorof KQ450 steel during different controlled rolling have been investigated by means of quantitative metallography, SEM, TEM and X-ray small angle scatter analysis.The results show that heating temperature is susceptible to the ferrite grain size of KQ450 steel; the precipitated phases are NbC, VC and V(CN); With increasingcooling rate the average size of the precipitated phases decrease.