期刊
MATERIALS AT HIGH TEMPERATURES
卷 38, 期 1, 页码 61-72出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09603409.2020.1830609
关键词
Super304H; ageing; creep; boiler Tube; M23C6; niobium
资金
- Korea Institute of Energy Technology Evaluation and Planning [20161110100090]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20161110100090] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The study compared the creep and tensile properties of service-exposed Super304H steel with virgin material, showing that the creep strength decreased significantly in the long-term serviced material. The degradation of properties in service-exposed material was discussed based on metallurgical analyses and precipitation mechanisms.
The determination of creep properties of the components operating at high temperatures in thermal power plants is an enormous concern for safe life assessment. In this study, a series of miniature creep and tension tests were carried out with service-exposed (54,750 h and 68,550 h at 650 degrees C) and virgin Super304H steel materials. The power law creep behaviour, creep rupture life, and tensile properties were compared among the virgin and service-exposed materials. The creep strength of the 54,750-h-serviced material was comparable to that of the virgin material, while it decreased significantly for the 68,550-h-serviced material. The degradation of the properties of the service-exposed material was discussed based on metallurgical analyses and precipitation mechanisms.
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