冷轧压下率对连续退火MR钢组织性能的影响

细小均匀的晶粒尺寸是保证高档MR钢镀锡板产品力学性能均匀性至关重要的因素。本文利用冷轧及连续退火模拟试验机,研究了冷轧压下率对连续退火MR钢镀锡基板组织性能的影响。结果表明:试样经620℃保温40s处理后可以获得完全再结晶显微组织,且退火再结晶平均晶粒尺寸随冷轧压下率呈非线性变化关系,平均晶粒尺寸与屈服强度、抗拉强度和显微维氏硬度之间符合Hall-Petch公式。

Influence of the cold rolling reduction rate on microstructures and mechanical properties of the continuous annealing MR steel

The homogeneous fine grain size is the essential factor for guaranteeing the mechanical property uniformity of the top- grade MR- based tinplate products. In this paper, using the cold rolling and continuous annealing simulation equipment , the influence of the cold rolling reduction rate on the microstructures and the mechanical properties of continuous annealing MR- based tinplate were investigated. The results show that the MR steels has the full recrystallization microstructures of annealing at 620 ℃ for 40 s , and furthermore, the cold rolling reduction rate dependence of the average grain sizes of the recrystallization microstructures is non- linear. By compared with the microstructures and the mechanical properties, it is revealed that the average grain size is fit to the Hall- Petch formula with the yield strength, the tensile strength and the micro- vickershardness.