Which condition could lead to material degradation in a gas turbine?

Excessive temperatures can lead to material degradation in a gas turbine due to the thermal stresses that high temperatures place on the turbine components. Gas turbines operate at high temperatures to achieve maximum efficiency, but when the temperatures exceed the material limits, several degradation processes can occur.

For instance, prolonged exposure to high temperatures can cause creep, which is the tendency of materials to deform permanently under long-term exposure to high stress and temperature. Additionally, oxidation can occur at elevated temperatures, leading to the weakening of materials and potential failure of turbine components. The microstructural integrity of materials, such as super alloys used in turbine blades, can also deteriorate, resulting in reduced mechanical strength and fatigue resistance.

Operating consistently at excessive temperatures could impact the lifespan and reliability of turbine components and systems, requiring careful monitoring and management to ensure safe and efficient operation.