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为了预测GH864合金Φ1250 mm涡轮盘锻造过程中微观组织的演变规律,将微观组织模型加入到模拟软件MSC Super-form中,实现了高温合金塑性变形-传热-微观组织演变的耦合。研究了不同变形工艺参数对涡轮盘组织分布的影响,包括初始变形温度、变形速率、模具预热温度、摩擦系数及保温措施等的影响。结果表明:实际Φ1250 mm涡轮盘试样环的组织分布情况与模拟结果相一致;对锻件添加包套、适当提高模具预热温度、使用具有良好润滑作用的润滑剂、适当提高变形速率均可使晶粒组织更加均匀细小。
In order to predict the evolution of microstructure during the forging process of Φ1250 mm turntable GH864 alloy, the microstructure model was added to the simulation software MSC Super-form to realize the coupling of plastic deformation, heat transfer and microstructure evolution of superalloy. The effects of different deformation parameters on the distribution of turbine disks were studied, including initial deformation temperature, deformation rate, mold preheating temperature, friction coefficient and insulation measures. The results show that the actual tissue distribution of the Φ1250 mm turbine disk is in accordance with the simulation results. Adding a sleeve to the forging increases the preheating temperature of the mold appropriately, and using lubricant with good lubricating effect, the deformation rate can be increased properly The grain structure is more uniform and small.