喷射成形FGH4095M高温合金冶金质量和力学性能研究

Research on Metallurgical Quality and Mechanical Properties of Spray Formed Superalloy FGH4095M

采用喷射成形技术制备了涡轮盘材料FGH4095M粉末高温合金沉积坯。从致密度、晶粒度、织构等方面分析了沉积坯的冶金质量，并对比分析了涡轮盘直接热等静压成形与等温锻造成形两种不同工艺下盘坯件的组织与性能。研究结果表明，氮气雾化喷射成形沉积坯致密度为99％以上，组织均匀致密，晶粒尺寸为10-40μm，在喷射沉积方向和垂直于喷射沉积方向的锭坯织构强度很弱，织构形貌相差不大。采用直接热等静压工艺制备的FGH4095合金盘坯力学性能在室温拉伸性能、高温拉伸性能等方面优于热等静压＋等温锻造工艺下的盘坯力学性能。热等静压＋等温锻造工艺下的二次γ’相尺寸较大。研究结果显示了喷射成形＋直接热等静压工艺是一条制造涡轮盘的富有生命力的工艺路线。

The deposits of FGH4095M superalloy used for turbine disk were prepared with spray forming（SF） technology. The metallurgical quality of deposit billet was analyzed from the aspects of density, grain size, texture and so on. Comparative research on micro- structure and mechanical properties between FGH4095M flat disk prepared with hot isostatic pressing （HIP） and FGH4095 flat disk prepared with HIP followed with isothermal forging （IF）. The results showed that the density of spray formed and nitrogen atomized deposit bil- let, which has compact structure, was above 99% of theoretical density. The range of the grain size is 10-40μm. The texture strength of billet is very weak in spray deposition direc- tion and perpendicular to the direction of spray deposition. Texture of two directions is al- most no difference. Compared with FGH4095 after HIP＋IF, FGH4095M after HIP has bet- ter mechanical properties at room temperature and high temperature. The sizes of primary γ＇ phase and secondary γ＇ phase are finer in FGH4095M after HIP in comparison with that in FGH4095 after HIP＋IF. This work shows SF＋HIP is a viable and short processing route for FGH4095M to manufacture turbine disk.