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首页> 外文期刊>HIGH TEMPERATURE MATERIALS AND PROCESSES >Gamma Prime Particle Coarsening Behavior at Elevated Temperatures in Cast Nickel-Based Superalloy, GTD-111 EA
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Gamma Prime Particle Coarsening Behavior at Elevated Temperatures in Cast Nickel-Based Superalloy, GTD-111 EA

机译：Gamma Prime Particle Coarsening Behavior at Elevated Temperatures in Cast Nickel-Based Superalloy, GTD-111 EA

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The objective of this research is to investigate the most appropriate heat treatment condition for a nickel base superalloy GTD-111 turbine blade with the suitable microstructure to enable the phase stability after long-term thermal exposure. The received turbine blade that had been used under load and high temperature showed the coarse gamma prime particles as well as connected to each other and thus forming into larger/longer particles. This result could reduce creep resistance and increases the failure. Therefore, long-term serviced turbine blades were reheated in 6 different conditions for microstructural refurbishment. In this research, 6 reheat treated superalloy GTD - 111 samples were long-term heated under simulated working condition at 1173 KAPPA and 1273 KAPPA. At every 1800 ks from the beginning of heat treatment until time reached 9000 ks, these samples were collected and the microstructure and size of gamma prime were examined. It was found that with heating at 1173 KAPPA, the sample passed the lowest solutioning temperature at 1398 KAPPA for 7.2 ks and (secondary) aging at 1118 KAPPA for 86.4 ks (with or without primary aging at 1328 KAPPA for 3.6 ks), showed the slowest growth of gamma prime size. For heating at 1273 KAPPA, all samples after various heat treatments showed similar results in coarsening behavior and quantity of precipitated gamma prime particles.

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