本文针对低C, 高Mn和高Nb化学成分, 采用轧后弛豫控制相变的组织调控技术得到5种不同铁素体/贝氏体(F/B)体积含量的双相组织
钢. 用改进的C-J分析方法分析了软相(铁素体)含量, 研究了晶粒尺寸对加工硬化性能的影响, 以及以铁素体和贝氏体为主的软硬相
混合组织的塑性变形协调关系. 并用电子背散射(EBSD)技术验证了双相组织在均匀塑性变形阶段的协调变形行为. 结果表明, 软硬相
的合理比例有利于提高加工硬化程度(高Rt1.5/Rt0.5), 降低屈强比, 同时能保证较高的均匀变形能力. 铁素体与贝氏体
之间的协调变形是提高双相组织钢应力比和均匀伸长率的主要机制.
Five ferrite/bainite (F/B) dual-phase steels with the chemistry of low carbon, high manganese and high niobium, and different volume fractions of bainite (15%-98%) were produced by control rolling+relaxing+ACC processing. With the help of the modified Crussard-Jaoul (C-J) analysis, the effects of soft phase (ferrite) content and its grain size on the work--hardening behavior of the steels and the cooperative deformation relationship between softer phase and harder phase were studied, which was validated by EBSD analysis. The results illustrate that a reasonable proportion of F/B can be helpful to improve initial work-hardening (a high Rt1.5/Rt0.5), reduce the yield ratio, and maintain a high uniform elongation. It is known that the cooperative deformation of ferrite and bainite is the main mechanism for improving the stress ratio and the uniform elongation of the F/B dual-phase steels.
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