The clarification of creep damage mechanism and the establishment of remaining life prediction methods of longitudinal welded piping of P91 steel are important subjects to maintain a reliable operation of boilers in thermal power plants. Internal pressure creep tests were conducted on P91 steel longitudinal welded tubes to characterize the evolution of creep damage with time and to evaluate a life prediction method. Interrupted creep tests were performed for damage observation in addition to rupture tests. Three dimensional finite element creep analyses of the longitudinal welded tube specimens were conducted to identify the stress and creep strain distributions within the specimen during creep. Failure occurred at a heat affected zone (HAZ) without a significant macroscopic deformation. It was found that the initiation of creep voids had concentrated at the midthickness region in the HAZ rather than in the surface. The creep analysis results indicated that the triaxial tensile stress yielded at the midthickness region in the HAZ due to difference of creep deformation property among the base metal, the HAZ, and the weld metal. It was suggested that the triaxial stress state caused acceleration of the creep damage evolution in the HAZ, resulting in internal failure of the tube specimens. A rupture time prediction method of the welded tube is proposed based on the maximum principal stress and the triaxial stress factor in the HAZ. The void growth behavior in the HAZ was well predicted by the previously proposed void growth simulation method by introducing a void initiation function to the method.
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e-mail: togata@criepi.denken.or.jp
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October 2010
Research Papers
Damage Evolution and Life Prediction of a P91 Longitudinal Welded Tube Under Internal Pressure Creep
Takashi Ogata,
e-mail: togata@criepi.denken.or.jp
Takashi Ogata
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan
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Takayuki Sakai,
Takayuki Sakai
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan
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Masatsugu Yaguchi
Masatsugu Yaguchi
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan
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Takashi Ogata
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japane-mail: togata@criepi.denken.or.jp
Takayuki Sakai
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan
Masatsugu Yaguchi
Central Research Institute of Electric Power Industry
, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, JapanJ. Pressure Vessel Technol. Oct 2010, 132(5): 051204 (9 pages)
Published Online: August 23, 2010
Article history
Received:
December 5, 2008
Revised:
April 12, 2010
Online:
August 23, 2010
Published:
August 23, 2010
Citation
Ogata, T., Sakai, T., and Yaguchi, M. (August 23, 2010). "Damage Evolution and Life Prediction of a P91 Longitudinal Welded Tube Under Internal Pressure Creep." ASME. J. Pressure Vessel Technol. October 2010; 132(5): 051204. https://doi.org/10.1115/1.4001688
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