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Outline
The cooling process following solution heat treatment significantly influences the microstructure and mechanical properties of powder metallurgy superalloy turbine disks. This study investigates the effects of air-forced cooling process parameters， including gas flow rate， air pipe diameter， and disk rotation， on the temperature distribution and cooling rate of turbine disk billets.The results reveal that an increase in the gas flow rate enhances the surface heat transfer of the turbine disk billet， creating a larger temperature gradient and achieving a higher cooling rate. When the gas flow rate remains constant， reducing the air pipe diameter leads to an increase in the local gas flow velocity， thereby strengthening the surface heat convection and raising the cooling rate. During rotation， the internal temperature gradient of the disk is reduced， resulting in a more uniform temperature distribution.The optimized air-forced cooling parameters， namely a gas flow rate of 240 m/s， an air pipe diameter of 10 mm， and disk rotation， are validated through experiments. After heat treatment， the grain size is uniformly distributed， measuring ASTM 7.5-8. The closer to the surface of the turbine disk billet， the higher the cooling rate， the finer the γ' phase， and the better the creep performance. Conversely， the core of the turbine disk billet has the lowest cooling rate， a coarser γ' phase size， and relatively poor creep performance.The grain size and creep properties of turbine disk billets quenched by air-forced cooling are comparable to those quenched by conventional oil cooling. Moreover， the creep plastic elongation at 68 h during creep is superior to that of oil-cooled quenching. Therefore， air-forced cooling quenching holds great promise as a turbine disk preparation process.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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