GH4169合金盘件热模锻工艺优化

Technics Optimisation of Hot Die Forging for GH4169 Disk

GH4169合金具有优异的综合力学性能和良好的加工、焊接性能,广泛用于使用温度在650oC以下航空发动机盘件的生产。GH4169是典型的工艺敏感型合金,锻造温度区间狭窄。其热加工工艺,尤其是锻造温度的控制,对锻件质量起着至关重要的作用。利用Deform-2D软件,对GH4169合金热模锻工艺进行数值模拟,在压机吨位不足的情况下,对模具形状进行改进,考察了试环位置的温度和变形量,确定了优化的锻件形状,对实际生产起到有益的指导作用。

GH4169 belongs to a class of nickel-iron base superalloys with a face-centered cubic(FCC) austenitic matrix that is strengthened by precipitation of an ordered body centered tetragonal(BCT) intermetallic precipitate γ' and face-centered cubic(FCC) intermetallic precipitate γ'. The properties of GH4169 are attributed to the precipitate strength combined with a fine grained microstructure lead to excellent mechanical properties such as low cycle fatigue resistance and elevated temperature strength. GH4169 is an important material used for aero-engine turbine disks. Quality and properties of disks restrict efficiency of engines. Forging technics is key factor of controlling quality of disks. In this paper, numerical simulation of hot die forging GH4169 disk under 5500 t water press was using Deform-2D software. Deformation field analysis results shown, that the disk cannot complete form due to the lack of force. Optimized forging project was acquired by improving die structure design.