【摘要】 通过合理的热加工工艺获得组织均匀细小的棒材是难变形高温合金GH4720Li研制成功的关键和难点。通过对变形高温合金开坯工艺调研以及在GH4720Li合金MTS热模拟实验和数值模拟基础上,对开坯工艺参数进行了初步确定,据此采用2000t快锻机对406mm的GH4720Li合金铸锭进行了开坯试制,获得的棒材组织均匀、细小,性能优良。实验结果表明,得到的GH4720Li合金开坯工艺参数合理可行。更多还原

【Abstract】 It is crucial to get uniform and fine grain microstructure for difficult-to-deform GH4720Li superalloy by appropriate hot deforming technology.The law of superalloy cogging and simulation with finite elements and MTS method for GH4720Li superalloy are investigated and the cogging parameters are preliminarily confirmed.On the basis of experimental results,a 406mm diameter ingot was trial-cogged by 2000t quick-forging press.The obtained grain microstructure is uniform and fine.It proves that the cogging parameters obtained by experiments are proper.更多还原