Evaluation of microstructure and creep damage in high-Cr ferritic steel welds |
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| Authors: | Masaaki TABUCHI Hiromichi HONGO National Institute for Materials Science -- Sengen Tsukuba Ibaraki - Japan |
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| Affiliation: | Masaaki TABUCHI and Hiromichi HONGO National Institute for Materials Science,1-2-1 Sengen,Tsukuba,Ibaraki,305-0047,Japan |
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| Abstract: | 11Cr-0.4Mo-2W-CuVNb steel (ASME Gr.122) is used for boiler components in ultra-supercritical (USC) thermal power plants.The creep strength of high-Cr steel welds decreases due to the formation of Type IV creep damage in the heat-affected zone (HAZ) during long-term use at high temperatures.In the present study,the processes and mechanisms of Type IV creep damage were elucidated by investigating the long-term creep strength,microstructure and damage behavior of Gr.122 steel welds.Creep tests using thick weld... |
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| Keywords: | Gr.122 steel Welded joint Creep void Type Ⅳ damage Finite element method Damage mechanics |
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