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采用Gleeble-1500D热模拟试验机根据设计的轧制工艺对7055合金进行多道次热压缩试验,模拟其企业热轧过程,采用电子背散射衍射和透射电镜研究了再结晶特征。在不同变形条件下,表现出不同的再结晶机制,主要动态再结晶机制有连续动态再结晶和几何动态再结晶。前者的形核机制主要为原始晶界弓出形核和亚晶合并形核;后者归因于严重的不均匀变形。在道次间的间隙期间,静态再结晶发生。另外,尺寸大于1μm的第二相也促进再结晶。
The Gleeble-1500D thermal simulation testing machine was used to carry out multi-pass hot compression tests on the 7055 alloy according to the designed rolling process to simulate the hot rolling process of the enterprise. The recrystallization characteristics were studied by electron backscatter diffraction and transmission electron microscopy. Under different deformation conditions, different recrystallization mechanisms were observed. The main dynamic recrystallization mechanisms were continuous dynamic recrystallization and geometric dynamic recrystallization. The former nucleation mechanism is mainly the original grain boundary arched nuclei and subgrain merge nucleation; the latter due to the serious uneven deformation. Static recrystallization occurs during the gap between passes. In addition, the second phase, which has a size of more than 1 μm, also promotes recrystallization.