A-25 1100℃級HIP再生タービン動翼の実機運転による寿命延伸検証(材料,一般講演)

概要

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The BLE process is a technology, which enables to regenerate a retired bucket and to reuse with equivalent to or better reliability and life than those of new buckets. According to the investigation results of serviced buckets, the life determinants for the buckets were microstructure degradation and creep deformation. Three technical developments were, therefore, conducted, which were microstructure regeneration technology using hot iso-static pressing (HIP), reformation one for tip shroud deflection, and life assessment one for refurbished buckets. Those technologies were at first developed for the 1100℃-class gas turbine buckets, and then were modified for 1300℃-class gas turbine buckets. Those technologies were evaluated to confirm the reliability whenever the longer operating buckets came out. Those technologies applied for commercially stage 2 buckets of 1100℃-class gas turbines up to the scheduled replacement life. After 35,000 hours operation, some of that buckets were evaluated the rate of life consumption rate of the HIP'ed buckets by the non-destructive and destructive test.
公益社団法人日本ガスタービン学会の論文
2009-10-21