摘要
以热力学和动力学理论为基础,研究了 Nb 微合金钢热变形过程中铁素体相的形核及长大过程,在形核速率计算中引入变形储能、晶界凸阶及微合金元素的作用,建立了低温变形诱导铁素体相变的动力学模型,分析了热变形参数和化学成分对相变分数和晶粒尺寸的影响．变形温度的降低和变形程度的增加,促进了α相变过程,相变体积分数增加,晶粒得到细化．C 与 Mn 含量增加的效果则相反．模型应用于热轧带钢生产过程的模拟,计算结果和实测结果吻合良好．
Based on the transformation thermodynamics and kinetics, the nucleation and growth of ferrite grain during hot deformation in Nb microalloyed steels were investigated. In view of the effect of deformation stored energy, effective deformation ledge and alloying composition, the basic kinetics model was established to simulate deformation induced transformation behavior, The transformation is promoted and more volume fraction and finer grain are obtained at high strain and low temperatures, whereas the reverse is true as C or Mn content increases, The present models can be applied to simulate the evolution of microstructure during hot--strip rolling. The results are in good agreement with measured ones.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2006年第2期131-135,共5页
Chinese Journal of Materials Research
基金
国家自然科学基金50334010
50474086
50504007
辽宁省博士科研启动基金20041009~~
关键词
材料科学基础学科
NB微合金钢
形变诱导相变
动力学模型
foundational discipline in materials science, Nb-microalloyed steel, deformation induced transformation, kinetics modeling
作者简介
本文联系人：吴迪，教授
