Creep Rupture Properties of Welded Joints of Heat Resistant Steels
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概要
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In this study, the high-temperature mechanical and creep rupture properties of Grade 91/Grade 91 (Mod. 9Cr-Mo) similar welded joints and Grade 91/Inconel 82/SUS304 dissimilar welded joints were examined. The effects of temperature and stress on the failure location in the joints were also investigated. Creep rupture tests were conducted at 823, 873, and 923 K; the applied stress ranges were 160-240, 80-160, and 40-80 MPa, respectively. The creep rupture strengths of the specimens with welded joints were lower than those of the specimens of the base metal at all temperature levels; in addition, these differences in creep strength increased with temperature. After being subjected to long-term creep rupture tests, the fracture type exhibited by the dissimilar welded joints was transformed from Types V and VII to Type IV. It was estimated that the fracture type exhibited by the dissimilar welded joints after 100,000-h rupture strength tests at 823 K and 873 K was Type IV fracture.
著者
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Yamazaki Masayoshi
Materials Database Station National Institute For Materials Science
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TABUCHI Masaaki
Materials Reliability Center, National Institute for Materials Science
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Tabuchi Masaaki
Materials Reliability Center National Institute For Materials Science
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WATANABE Takashi
Materials Reliability Center, National Institute for Materials Science
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HONGO Hiromichi
Materials Reliability Center, National Institute for Materials Science
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