Application And Characteristics Of High Temperature Alloy Gears in Gas Turbines भारत

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 Application and characteristics of high temperature alloy gears in gas turbines

During the operation of the gas turbine, the gears are exposed to extremely high temperatures. High-temperature alloy materials have excellent high-temperature strength and can withstand huge loads at high temperatures. For example, nickel-based high-temperature alloys can still maintain high yield strength and tensile strength at temperatures as high as 700-1000°C. This is because the nickel element and other alloying elements (such as chromium, molybdenum, tungsten, etc.) in the alloy form a stable strengthening phase, which can effectively prevent the slip and deformation of grains at high temperatures, ensuring that the gears will not be excessively deformed or broken under high temperature and high stress conditions.
This high-temperature strength property enables the gears to transmit power stably, and even when the gas turbine is running for a long time or under high power output conditions, it can still maintain good mechanical properties, effectively avoiding reduced power transmission efficiency or system failures caused by gear deformation.

During the frequent startup, shutdown and load changes of gas turbines, gears will experience repeated heating and cooling cycles. High-temperature alloy gears have good thermal fatigue resistance and can withstand the stress changes caused by such thermal cycles. The microstructure in the alloy is specially designed, such as adding some elements with high melting points and good thermal stability, so that the internal structure of the gear will not easily crack or be damaged when the temperature changes sharply.
When the gear cools rapidly from the high-temperature working state, or heats up rapidly during the startup process, the thermal fatigue resistance can ensure that the gear will not fail prematurely due to thermal stress concentration, thereby ensuring the reliability of the gas turbine power transmission system.

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