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针对鼓形环坯建立了环件径轴向轧制三维有限元模型,通过Simufact软件对鼓形环坯轧制的宏微观变化进行了耦合模拟,模拟揭示了鼓形环坯在轧制过程中的温度、等效应变、晶粒、动态再结晶的分布和演化规律;深入研究了轧制成形过程中径向每圈压入量对环锻件微观组织大小的影响规律。结果表明:基于鼓形环坯获得的环锻件,其内外侧棱边处发生的动态再结晶体积分数最大,晶粒最为细小,其次是内外表面和上下表面,心部动态再结晶体积分数最小,晶粒尺寸最大;适当增大径向每圈压入量,能够扩大动态再结晶区域,获得晶粒尺寸细小的环锻件。
The three-dimensional finite element model of ring-rolling of the ring was established for the drum-shaped ring blank. Coupled simulation was carried out by Simufact software on the macro-micro changes of the drum-shaped ring. The simulation revealed that during the rolling process Temperature, equivalent strain, grain size and dynamic recrystallization. The effects of the amount of radial per-pass in rolling process on the microstructure of ring forging were studied in detail. The results show that the ring forging obtained from the drum ring has the largest volume fraction of dynamic recrystallization at the inner and outer edges, the smallest grain size, the second is the inner and outer surfaces and the upper and lower surfaces, and the dynamic recrystallization volume fraction is the minimum. The largest grain size; appropriately increase the amount of radial per lap, can expand the dynamic recrystallization region, to obtain a small grain size ring forgings.