OS1439 1Cr-1Mo-0.25V鋼のクリープに伴う水素放出特性の変化(エネルギー機器の経年劣化に関する健全性評価,オーガナイズドセッション)

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The creep ruptured specimens of 1Cr-1Mo-0.25V steel were charged with hydrogen by cathodic electrolysis and then they were subjected to the thermal desorption spectroscopic analysis to examine an applicability of hydrogen as a tracer for evaluating creep damage. Experimental results revealed that a hydrogen evolution peak appeared at around 60-70℃ in the hydrogen desorption spectra of all the specimens. The peak height of gauge portion had a tendency to increase with increasing time to rupture, although that of grip portion decreased to the contrary. The increase in hydrogen desorption in the gauge portion was considered to be attributable to the geometrical damage introduced by creep such as creep voids and microcracks, because the hydrogen desorption spectrum was not consistent with that of as-tempered even after re-normalizing.
2009-07-24