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为了研究某厂热连轧纯钛卷精轧段的变形抗力问题,根据工业生产的实际轧制工艺,确定该精轧段的轧件形变行为条件为:变形温度范围为700~800℃,应变速率为5~25 s~(-1),最大变形量为0.8,对纯钛进行热压缩试验。结果表明:纯钛的流变应力随变形温度升高而降低,随应变速率升高而升高,变形机制受到温度和应变速率的影响较大,温度为700℃、应变速率为1 s~(-1)时主要以动态回复为主,随着温度和应变速率的增加,动态再结晶程度不断增加,当温度为800℃、应变速率为20 s~(-1)时,再结晶比较充分,组织均匀性良好。根据热模拟实验得到的真应力-应变数据,同时考虑化学成分的影响,基于Johnson-Cook模型建立了能够综合反映诸多因素的变形抗力模型,由变形抗力模型得到的轧制力计算值与实际值的比较验证了模型可靠性,为热连轧纯钛卷精轧生产的工艺控制提供了有效依据。
In order to study the deformation resistance of the finishing roll of a pure titanium roll in a hot strip mill, according to the actual rolling process of the industrial production, the deformation conditions of the roll piece in the finish rolling section are determined as follows: the deformation temperature range is 700-800 ° C, The rate of 5 ~ 25 s ~ (-1), the maximum deformation of 0.8, the thermal compression of pure titanium. The results show that the flow stress of pure titanium decreases with the increase of deformation temperature and increases with the increase of strain rate. The deformation mechanism is greatly affected by temperature and strain rate. The temperature is 700 ℃ and the strain rate is 1 s ~ -1), the dynamic recrystallization mainly increases with the increase of temperature and strain rate. When the temperature is 800 ℃ and the strain rate is 20 s ~ (-1), recrystallization is sufficient, Tissue uniformity is good. According to the true stress-strain data obtained from the thermal simulation experiment, taking into account the influence of the chemical composition, a deformation resistance model that comprehensively reflects many factors is established based on the Johnson-Cook model. The calculated and actual values of the rolling force obtained from the deformation resistance model The comparison verifies the reliability of the model and provides an effective basis for the process control of hot rolled pure titanium roll finishing.