FGH96 合金环件风冷淬火过程数值模拟

The influence of air-cooled quenching parameter on temperature distribution,cooling rate,residual stress of FGH96 powder metallurgy(PM)superalloy ring was investigated by numerical simulation. The results reveal that on the basis of gas flow velocity of 90 m/s,overall improvement or only increasing the gas flow velocity of the middle nozzle to 120 m/s leads to the cooling rate enhancement of PM superalloy ring. The cooling rate of rings under different air-cooling conditions can be maintained above 120 °C/min for an adequate time,which ensures the precipitation of γ′ phase. Improving the gas flow rate of the middle nozzles can intensify the cooling rate at the core of ring,resulting in the homogenization of temperature distribution,which indicates the preferred air-cooled quenching solution. The surfacial residual stress of the ring by air-cooled quenching is 35 MPa lower than that of ones by after conventional oil quenching with uniform distribution,which is conducive to the residual stress control of the ring.