期刊
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
卷 33, 期 10, 页码 4813-4821出版社
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-019-0922-9
关键词
HP40Nb alloy; Reformer tube; Carbide; Creep test; Larson-Miller parameter
资金
- Ministry of Trade, Industry & Energy (MOTIE), Republic of Korea [2013 2010 500060]
- [20141010101850]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20141010101850, 20132010500060] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [22A20152813260] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In the present work, several specimens were obtained from microalloyed HP40Nb reformer tubes with the different serviced period. The creep tests were conducted at a temperature of 950 degrees C and under stress levels in the range 25-55 MPa. Results indicated that the degradation of the creep life was due to the increase of the serviced period. The microstructural degradation and creep voids were observed at the grain boundary regions, attributed to the main reason leading to the premature creep failure. The creep exponent started decreasing after the servicing and approached a constant value after 7.2 years. The creep coefficient was obtained to be a function of time when the creep exponent was constant. Norton's creep power law equation was used to derive an equation describing the relationship between the diametrical expansion and serviced period of the reformer tubes. Larson-Miller curves were obtained from creep test data. Amount of carbides from the different serviced period was also calculated.
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