High temperature stability: GH145 alloy has excellent stability in high temperature environments from 1000 to 1100, where it can maintain high strength and hardness.
Oxidation resistance: GH145 alloy has remarkable stability in oxidizing environments due to its special chemical composition.
Corrosion resistance: GH145 alloy exhibits extremely high corrosion resistance in wet, salty and other corrosive environments.
Heat treatment system;
* The solution heat treatment system of plates, strips and tubes in the state is 980 15, air cooling. For intermediate heat treatment systems for materials and parts, the following processes are available:
Annealing: 955 1010, water-cooled.
Annealing before welding: 980 for 1 hour.
Weldment stress relief annealing: 900 °C, heat preservation for 2 hours.
Stress relief annealing: 885 15, 24 hours.
The main constituent elements of GH145 alloy are as follows:
Nickel (Ni): As the main element, it plays a basic role in strengthening the material and improves the heat resistance.
Chromium (CR): Mainly improves the resistance of the alloy to oxidation and corrosion, and increases the hardness.
Molybdenum (Mo) and Cobalt (Co): Enhance the creep resistance and high temperature stability of the alloy.
Copper (Cu): Increases the hardness and corrosion resistance of the alloy.
Aluminum (Al) and titanium (Ti): play a major strengthening role and improve the high-temperature performance of the alloy.
GH145 parts heat treatment process:
Heat treatment of finished parts:
For parts operating above 600 and requiring long-lasting creep performance:
Solid solution: 1150 15, heat preservation 2 4h, air cooling;
Aging: 845 15, heat preservation 24h, air cooling +705 15, heat preservation 24h, air cooling.
For parts operating below 600 and requiring room temperature and high temperature tensile properties:
Solid solution: 980 15, heat preservation 8h, 50 h furnace cooling to 620 10, heat preservation 8h, air cooling.
Aging: 730 15, heat preservation 8h, 50 h furnace cooling to 620 10, heat preservation 8h, air cooling.
The following heat treatment system is generally adopted for annular parts:
Solid solution: 1095 15, heat preservation 2 4h, air cooling;
Aging: 845 15, heat preservation 24h, air or furnace cooling +705 15, heat preservation 20h, air cooling.