论文部分内容阅读
利用热加工图分析了FGH4096粉末高温合金的热变形行为,评定了益加工区,预测了变形失稳区;结合热加工图与组织分析建立了此合金在真应变0.65下的微观变形机制示意图。不同应变量下获得的热加工图表现出一致的特征:从“低温/低速”区到“高温/高速”区存在明显的益加工带;而“低温/高速”区和“高温/低速”区则是被预测的变形失稳区。HIPedFGH4096合金的热加工性能直接受动态再结晶的影响:在“低温/低速”和“高温/高速”下发生的完全再结晶及其粗化过程均对应着高的能量耗散率,有利于合金的热加工;而在“低温/高速”下动态再结晶受到抑制,潜在着原始颗粒边界萌生裂纹而导致变形失稳的可能性。
The hot deformation behavior of FGH4096 powder superalloy was analyzed by hot working drawing. The beneficial working zone was evaluated and the deformation instability zone was predicted. The microscopic deformation mechanism of this alloy under true strain of 0.65 was established by combining the hot working diagram and the microstructure analysis. The hot processed plots obtained at different strain levels showed consistent characteristics: there was a significant benefit in processing zones from the “low temperature / low speed” zone to the “high temperature / high speed” zone and the “low temperature / high speed” zone and The “High Temperature / Low Speed” zone is the predicted zone of deformation failure. The hot workability of HIPedFGH4096 alloy is directly affected by the dynamic recrystallization: the complete recrystallization and its coarsening at both “low temperature / low speed” and “high temperature / high speed” all correspond to high energy dissipation rate , Which is beneficial to the thermal processing of the alloy. However, the dynamic recrystallization under “low temperature / high speed” is inhibited, and the possibility of initial instability of the original grain boundaries may occur.