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Creep Strength of Dissimilar Welded Joints Using High B-9Cr Steel for Advanced USC Boiler

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Abstract

The commercialization of a 973 K (700 °C) class pulverized coal power system, advanced ultra-supercritical (A-USC) pressure power generation, is the target of an ongoing research project initiated in Japan in 2008. In the A-USC boiler, Ni or Ni-Fe base alloys are used for high-temperature parts at 923 K to 973 K (650 °C to 700 °C), and advanced high-Cr ferritic steels are planned to be used at temperatures lower than 923 K (650 °C). In the dissimilar welds between Ni base alloys and high-Cr ferritic steels, Type IV failure in the heat-affected zone (HAZ) is a concern. Thus, the high B-9Cr steel developed at the National Institute for Materials Science, which has improved creep strength in weldments, is a candidate material for the Japanese A-USC boiler. In the present study, creep tests were conducted on the dissimilar welded joints between Ni base alloys and high B-9Cr steels. Microstructures and creep damage in the dissimilar welded joints were investigated. In the HAZ of the high B-9Cr steels, fine-grained microstructures were not formed and the grain size of the base metal was retained. Consequently, the creep rupture life of the dissimilar welded joints using high B-9Cr steel was 5 to 10 times longer than that of the conventional 9Cr steel welded joints at 923 K (650 °C).

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Acknowledgments

This research is a part of the A-USC technology development project supported by a grant from the Ministry of Economy, Trade and Industry (METI) of Japan.

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Authors and Affiliations

  1. Creep Resistant Materials Group, Materials Reliability Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan

    Masaaki Tabuchi (Group Leader)

  2. Materials Information Station, National Institute for Materials Science, Tsukuba, Japan

    Hiromichi Hongo (Principal Engineer)

  3. Materials Reliability Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan

    Fujio Abe (NIMS Invited Researcher)

Authors
  1. Masaaki Tabuchi
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  2. Hiromichi Hongo
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  3. Fujio Abe
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Correspondence to Masaaki Tabuchi.

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Manuscript submitted December 26, 2013.

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Tabuchi, M., Hongo, H. & Abe, F. Creep Strength of Dissimilar Welded Joints Using High B-9Cr Steel for Advanced USC Boiler. Metall Mater Trans A 45, 5068–5075 (2014). https://doi.org/10.1007/s11661-014-2471-2

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