OS6-11 実機高中圧タービンロータの脆化度調査(OS6 設備診断・運用保全技術,分散と集中の共存)

概要

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We measured FATT (50% fracture appearance transition temperature) of around of the center hole of five retired CrMoV high & intermediate pressure steam turbine rotors which were used in the thermal power stations. As the results, (1). CrMoV turbine rotors were embrittled at the estimated used temperature 350〜460℃, and there was the most embrittlement degree at about 400℃. This tendency was the same any type rotors. (2). As these embrittlement showed some correlation with J-factor, it was supposed that the reduction of impurity elements was effective to reduce susceptibility to temper embrittlement of a CrMoV turbine rotor.
一般社団法人日本機械学会の論文
2006-06-28