Abstract
Mod.9Cr steels are widely used as boiler materials in ultra-super critical power plants. In this study, creep tests were conducted using miniature specimens with 1mm diameter machined from a base metal, weld metal and a heat affected zone (HAZ) in a Mod.9Cr-1Mo welded joint. Creep deformation and rupture behaviors of the miniature base metal specimens were almost identical with those obtained from standard size specimens. Material constants of the Norton law were determined from obtained datum by the miniature creep specimens. Creep rupture times of the miniature welded joint specimens were much lower than those of the standard size specimens. The finite element creep analysis results indicated that the triaxiality factor in the HAZ of the miniature welded joint is smaller than that of the standard size welded joint resulting in faster creep strain rate in the miniature specimen under the same applied stress.
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