Evaluation of Creep Strength Property of Mod.9Cr -1Mo Welded Joint by Using a Miniature Specimen

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  • ミニチュア試験片を用いた改良9Cr-1Mo鋼溶接部のクリープ強度特性評価
  • ミニチュア シケンヘン オ モチイタ カイリョウ 9Cr-1Moコウ ヨウセツブ ノ クリープ キョウド トクセイ ヒョウカ

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Abstract

<p>Development of creep damage assessment methods of Mod.9Cr-1Mo welded joints which are widely used for pipes in USC power plants are an urgent subject. Miniature specimens with 1mm diameter and 5mm parallel length were machined from a base metal, weld metal and a heat affected zone (HAZ) in a Mod.9Cr-1Mo welded joint. Creep tests of these miniature specimens were performed in inert gas atmosphere by a specially developed creep testing machine. Creep deformation and rupture behaviors of the miniature base metal specimens were almost identical with those obtained from standard size specimens with 10mm diameter confirming that the miniature specimen is available to obtain the same creep strength property as obtained by standard size specimens. Creep strength of the weld metal is comparable with the base metal and that of the HAZ is lower than these metals. Material constants of the Norton’s law were determined from obtained datum by the miniature creep specimens. Creep tests were also conducted with the miniature and the standard size welded joint 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 was smaller than that of the standard size welded joint resulting in faster creep strain rate in the miniature specimen under the same applied stress. Determination procedure of creep deformation property of a HAZ in a welded joint and creep rupture times of the standard size welded joints by creep test results of the miniature welded joint specimens were proposed based on the creep test and the finite element analysis results.</p>

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