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采用Gleeble-1500D试验机研究低碳高强钢在高温(大于1200℃)及低变形速率(小于10-2 s-1)条件下的拉伸流变行为。采用的拉伸试验包括单拉伸试验及双拉伸试验。实验钢在高温条件下,铸态组织奥氏体化,并且随温度升高及保温时间延长,奥氏体晶粒明显粗化,对高温流变行为产生较大影响。考虑实验钢奥氏体晶粒粗化现象的本构方程能够较好吻合实验测量的应力-应变数据。
The tensile rheological behavior of low carbon high strength steel under high temperature (> 1200 ℃) and low deformation rate (less than 10-2 s-1) was investigated by Gleeble-1500D testing machine. Tensile tests used include single tensile test and double tensile test. Under the condition of high temperature, the as-cast microstructure of the experimental steel is austenitized, and as the temperature increases and the holding time prolongs, the austenite grain coarsens obviously, which has a great influence on the rheological behavior at high temperature. The constitutive equation considering the coarsening of the austenite grain in the experimental steel is in good agreement with the experimentally measured stress-strain data.