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冷轧带钢时,带钢的屈服强度随变形程度增加而增加,从而引起轧制金属变形抗力增加。这种随变形程度增加金属屈服强度增加的现象被称为硬化。表示金属屈服强度随变形程度增加的规律曲线,叫硬化曲线。揭示轧制时金属硬化的规律和求出考虑硬化来计算金属屈服强度的数学模型或硬化曲线,对正确制定冷轧带钢压下规程是有重要意义的,也是必须的。因为,金属的屈服强度是计算轧制力时不可少的主要变量。冷轧时带钢的硬化规律,主要取决于金属的材质、变形程度、变形速度和变形温度。从理论上,只能定性的来确定硬化规律,而在定量上的确定是十分困难的。
Cold-rolled strip, the yield strength of the strip increases with the degree of deformation increases, resulting in increased deformation resistance of rolled metal. This phenomenon of increasing the yield strength of the metal with increasing degree of deformation is called hardening. Said metal yield strength increases with the degree of deformation curve, called hardening curve. Revealing the law of metal hardening during rolling and finding a mathematical model or hardening curve for calculating the yield strength of metal considering hardening are of great importance and necessary for the correct formulation of cold rolling strip reduction rules. Because metal yield strength is an indispensable main variable in the calculation of rolling force. Cold-rolled strip hardening law, mainly depends on the metal material, deformation, deformation speed and deformation temperature. In theory, the law of hardening can only be determined qualitatively, and it is very difficult to determine quantitatively.