中文摘要：

分析了多道次轧制工艺参数对含钒钢组织性能的影响，以主成分分析法和偏最小二乘法建立工艺参数与组织参数回归模型，确定优化方向。实验方法以灰色理论为依据，建立多指标决策的灰关联度量化模型，对含钒钢综合性能进行排序，确定最优方案，为工艺参数的优化提供决策支持。研究表明：对成分、第一道次变形温度、第二道次变形量，第一二、三四道次间隔时间等参数进行控制可以得到综合性能较好的材质，其F铁素体≥75％，Bfine≥60％、纳米级析出相尺寸（σ）（10-50）nm，晶粒尺寸（τ）3．4μm。

英文摘要：

[ Abstract] Analyses the influence of multi-pass parameters on the vanadium-alloyed steel and finds a best way of optimization by making up a model using aprincipal component analysis and PLS algorithm. The method adopted builds a multiple-decision-making grey incidence model bases on the Grey Theory, and rank its comprehensive performances of the vanadium-alloyed steel and provides a better decision- making support system for the optimization of its process parameter. The result shows that controlling of the components ,the Pass I deformation temperature ,the Pass [[ deformation amount,and the interval between pass Ⅰ/Ⅱ and pass Ⅲ/Ⅳ would improve the comprehensive performance of the material with itsF铁素体≥75%, Ffine≥ 60%, nano-scale precipitation phase size（σ）（ 10-50 ）nm,gra/n size 3.4μm