Abstract
The T92 martensitic and Super304H austenitic dissimilar steels welded joints were always encountered in the super critical boilers. The isothermal method was used to assess the creep rupture strength of weld joints. With the higher loading stress, the transcrystalline fracture was the rupture mode of creep specimens, and results in forming dimples. With the higher loading stress, the transcrystalline fracture was the rupture mode of creep specimens and results in forming dimples. With the lower loading stress, creep cavities joined each other along the grain boundary, the creep rupture was the rupture mode of creep specimens and results in cleavage rupture.
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