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在Gleeble-3800热模拟试验机上,利用热压缩变形研究EH47号船板钢的热变形特性。设置最大真应变为0.7,变形温度分别为950、1 000、1 050、1 100、1 150℃,变形速率为0.1、0.5、1、5、10 s-1。利用试验所得数据通过一系列公式计算并绘制热加工图,结合不同压缩工艺得到的金相组织对比发现:变形温度为(1 000±10)℃、应变速率为0.1 s-1区域耗散率因子η值达0.62以上,再结晶晶粒细小而均匀,为热加工最佳工艺参数;而变形温度为950~1 050℃、应变速率为0.5~2 s-1区域再结晶晶粒较少,晶粒尺寸参差不齐为加工失稳区,热加工时应避免选择该区域。根据热加工图中得出的最佳热加工工艺参数,计算得出现场最佳轧制参数:轧制温度为1 000℃,压下量为15~20 mm。
On the Gleeble-3800 thermal simulator, the hot deformation of EH47 ship steel was studied by means of hot compression deformation. Set the maximum true strain of 0.7, the deformation temperature of 950,1 000,1 050,1 100,1 150 ℃, the deformation rate of 0.1,0.5,1,5,10 s-1. A series of formulas were used to calculate and draw the hot working diagram according to the experimental data. The metallographic structure comparison of different compression processes showed that the deformation temperature was (1 000 ± 10) ℃ and the strain rate was 0.1 s-1 η value of more than 0.62, the recrystallized grains are small and uniform, the best processing parameters for thermal processing; and the deformation temperature is 950 ~ 1 050 ℃, the strain rate of 0.5 ~ 2 s-1 recrystallized grains less crystalline Uneven grain size for the processing of instability zone, thermal processing should avoid the choice of the region. According to the hot working process drawing the best thermal processing parameters, calculated the best rolling site parameters: the rolling temperature of 1 000 ℃, the reduction of 15 ~ 20 mm.