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(서울과학기술대학교) (서울과학기술대학교) (서울과학기술대학교)
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한국신뢰성학회 신뢰성응용연구 신뢰성응용연구 제15권 제4호
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    초록·키워드

    Accelerated degradation mechanism of the heat-resistant steel for high temperature plant was analysed in terms of microstructure and hardness. In order to simulate the microstructure of the steel actually used at 540℃ in the field, isothermal exposure was carried out at 630℃ up to 4,800 hours. The artificial degradation mechanism was comparatively verified to successfully simulate degradation of the long-time used field material. For the artificially degraded specimens, databases including size and aspect ratio of carbide, chemical composition (i.e., Cr/Mo ratio) of grain boundary carbide were built up. These degradation parameters were suggested as fingerprints for PHM (i.e., prognostics health management) of power plants.

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