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研究了冷轧压下率和平整伸长率对低碳钢退火板组织性能的影响。结果表明,在相同的退火工艺下,提高冷轧压下率能有效减小铁素体晶粒尺寸,晶粒的细化不仅提高了屈服强度和屈强比,而且还增大了屈服平台伸长率。通过Hall-Petch和Hollomon方程分别建立了试验钢屈服强度与晶粒尺寸,以及屈服平台伸长率与晶粒尺寸之间的定量关系。随着平整伸长率的提高,屈服强度先减小后增大,而抗拉强度变化不明显。采用1.5%平整伸长率不仅可以消除7.2%屈服平台,并能使试验钢保持最低的屈服强度和屈强比。
The effects of cold rolling reduction ratio and leveled elongation on microstructure and properties of low carbon steel annealed sheet were studied. The results show that under the same annealing process, increasing the rolling reduction can effectively reduce the ferrite grain size. The grain refinement not only improves the yield strength and yield ratio, but also increases the yield stress Length. The yield strength and grain size of the test steel were established respectively by Hall-Petch and Hollomon equations, and the relationship between the yield elongation and the grain size was established. With the increase of the flattening elongation, the yield strength first decreases then increases, but the tensile strength does not change obviously. The 1.5% flattening elongation not only eliminates the 7.2% yield platform, but also keeps the test steel at its lowest yield strength and yield ratio.