Microstructural Degradation and Creep Property Damage of a Second-Generation Single Crystal Superalloy Caused by High Temperature Overheating

Nickel base superalloys are widely used to manufacture turbine blades, and overheating poses a serious threat to the safe service of turbine blades. In this study, a second-generation nickel base single crystal superalloy was taken as the research object, and we carried out the overheating treatment at 1100 degrees C and 1300 degrees C, and then tested the creep properties at 1000 degrees C/300 MPa and 1100 degrees C/130 MPa. Through systematic analysis of creep properties, gamma/gamma' phases, and creep voids, the effects of overheating on the microstructures and creep properties of the experimental superalloy were revealed. The results demonstrate that the effect of overheating at 1100 degrees C on the microstructure of the experimental superalloy can be ignored, and the effect on the creep property is limited. The degree of gamma' dissolution is gradually increased and the creep property is reduced with overheating time extending at the overheating temperature of 1300 degrees C.

Automated summary

In this study, the effects of overheating on the microstructures and creep properties of a second-generation nickel base single crystal superalloy were investigated. Overheating treatment was conducted at 1100°C and 1300°C, followed by creep tests at 1000°C/300 MPa and 1100°C/130 MPa. The results showed that overheating at 1100°C had negligible effect on the microstructure and limited effect on creep properties. However, with extended overheating time at 1300°C, there was an increase in γ' dissolution and reduction in creep properties.