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为实现合金钢50Si Mn VB高温下塑性变形的数值模拟与合理制定其热成形工艺参数,采用Gleeble-1500D热模拟试验机探讨其在不同温度、应变速率下的流变力学行为。研究了影响该材料流变应力的因素和机制。结果表明,该材料高温变形时存在应变强化与再结晶软化相互竞争机制,体现为流变应力随应变速率的增加而增大,随温度升高而减小。利用本构模型求解得到50Si Mn VB材料的本构关系,通过比较理论值和实验值,证明该模型可预测50Si Mn VB材料在热变形时的塑性流变应力。
In order to simulate the plastic deformation of 50Si Mn VB at high temperature and to develop the parameters of the hot forming process, the rheological behavior of the steel at different temperatures and strain rates was investigated by Gleeble-1500D thermal simulation tester. The factors that affect the flow stress of the material and the mechanism are studied. The results show that there exists a competing mechanism between strain strengthening and recrystallization softening when the material is deformed at high temperature. The results show that the flow stress increases with the increase of strain rate and decreases with increasing temperature. The constitutive relation of 50Si Mn VB material was solved by the constitutive model. The theoretical and experimental results were compared to prove that this model can predict the plastic flow stress of 50Si Mn VB material during hot deformation.