粉末高温合金超塑性等温锻造技术研究

Superplastic Isothermal Forging Technology of P/M Superalloy

对FGH96合金超塑性及等温锻造工艺进行了研究,结果表明,FGH96合金经晶粒细化处理后,在1020-1100℃,具有良好的超塑性;FGH96合金超塑变形时流变应力比热等静压后直接变形时显著降低,在1050℃以1×10^-4s^-1进行恒应变速率压缩变形,其流变应力只有60MPa左右;将FGH96合金超塑性变形应用于大型涡轮盘的等温锻造,使小设备超塑性等温锻造大型涡轮盘锻件成为可能。

The superplastie behavior and isothermal forging technology of FGH96 alloy were investigated in this paper. The experimental results show that grain-refining treated FGH96 alloy obtained extremely significant superplasticity at temperature 1020 - 1100杨℃. When as-HIP and HIP ＋ HIF FGH96 alloy was isothermal compressed at the same deformation condition, the flow stress of HIP ＋ HIF FGH96 alloy was significantly reduced. The results of investigation on superplastic isothermal forging process of FGH96 alloy have made it possible to produce large disc forgings with relatively smaller equipment.