Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 560, Issue -, Pages 678-684Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.10.013
Keywords
Martensitic P91 steel; Welded joint; Fine grained heat affected zone; Creep rupture strength
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The martensitic P91 steel (9 Cr-1Mo-V-Nb) has been used for high temperature components in the highly ultra super critical pressure steam power plants. The creep behaviour in terms of creep rupture strength and minimum creep rate of the welded joints of this steel is controlled by that of the fine-grained heat affected zone (FGHAZ). The factors which results in the reduction of the creep rupture strength and the increase in the minimum creep rate of FGHAZ at 650 degrees C were determined and discussed. it was found that the main difference between the welded joint zones is the prior austenite grain size. The finer the prior austenite grain size as in FGHAZ, the higher is the rate of recovery of dislocations, the rate of coarsening of the subgrain structure and coarsening of the intergranular Cr-rich carbide particles, consequently, the lower the creep resistance. (C)2012 Elsevier B.V. All rights reserved.
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