TS-101 Material Degradation and Damage Assessment for Gas Turbine Transition Pieces(Session D-5 Maintenance and Control 2)

概要

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Serviced gas turbine transition pieces made of both Hastelloy X and Nimonic 263 were analyzed. Those of Hastelloy X were suffered from heavy creep deflection with material degradation, whereas those of Nimonic 263 were not, but the material degradation was observed. This paper describes the degradation behaviors of microstructure and mechanical properties of Nimonic 263 during aging. By using the samples aged at temperatures of 750°-900℃ up to 24,000h, η phases were preferentially observed at temperatures of 800℃ and 850℃. Time and temperature dependency of γ' coarsening and temperature dependency of η inter-lamellar spacing were analyzed and formulated. Effects of precipitates on creep properties, which were minimum creep rate and rupture life, were also investigated. γ' phase was found to be good relationship with the creep properties as a function of mean diameter and inter-particle distance, but η phase was not found to have any relationship with the properties.
社団法人日本ガスタービン学会の論文
1999-11-14