首页|High-temperature creep rupture behavior of dissimilar welded joints of RAFM steel and 316L steel by friction stir welding
High-temperature creep rupture behavior of dissimilar welded joints of RAFM steel and 316L steel by friction stir welding
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Creep rupture of the reduced activation ferritic/martensitic(RAFM)steel and 316L steel dissimilar joint by friction stir welding was investigated.The creep rupture time of the dissimilar joint was 1941 h at 600℃/100 MPa and 120 h at 650℃/100 MPa.The creep fracture occurred in heat affect zone(HAZ)of RAFM steel side where coarse Laves phase was detected.The formation and coarsening of the Laves phase particles in HAZ of RAFM steel side were the main reasons that caused the creep fracture of the dissimilar joint.The Laves phase particles nucleated adjacent to the large M23C6 particles at the grain boundaries where W element segregated and grew fast during creep exposure.The large Laves phase would deteriorate the pinning effect of M23C6 carbides and weaken the solid solution strengthening effect.Besides,the size of the Laves phase in HAZ of RAFM steel side was bigger than that in stir zone of RAFM steel side.These reasons explain the creep fracture in HAZ of RAFM steel side of dissimilar joint.
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