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热轧是Hi-B电工钢生产中控制织构及析出的最重要环节之一。研究中观察到,与大生产热轧板相比,实验室热轧很容易导致二次再结晶退火后出现沿轧向生长很长的长条晶。为澄清其形成机制,本文对比研究了大生产和实验室热轧及退火后样品中的组织形貌、织构及析出。结果表明,初始粗大晶粒、低的热轧压下量及低的终轧温度导致析出提前发生并沿轧向分布造成二次再结晶退火后长条晶粒及细小的线晶的出现。
Hot rolling is one of the most important steps in texture control and precipitation during the production of Hi-B electrical steel. In the study, it was observed that hot rolling in the laboratory can easily lead to long-grain growth along the rolling direction after secondary recrystallization annealing compared with large-scale production of hot-rolled sheet. In order to clarify the formation mechanism, this paper comparatively studied the morphology, texture and precipitation of the samples in hot rolled and annealed samples of large production and laboratory. The results show that the initial coarse grains, the low hot rolling reduction and the low finish rolling temperature lead to the occurrence of premature precipitation and the secondary recrystallization annealing along the rolling distribution to form long grains and fine lines.