B-2 1100℃級ガスタービン初段動翼コーティング材の劣化・損傷解析 : 第2報(材料・損傷I,一般講演)

概要

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This paper presents the evaluated result of coating cracks on the stage 1 buckets by the investigation with serviced bucket and numerical simulation. Four kinds of different coatings in the 1100℃-class gas turbines stage 1 buckets serviced for around 10^4 hours were investigated with 3-point bend tests at elevated temperatures. There was found to be very profound relationship between the serviced bucket coating cracking behaviors and coating ductility of the ductile-to-brittle transition temperatures and the strain-to-cracking. On the other hand, according to the evaluation of the unsteady thermal stress on the bucket, the coating cracks can be initiated or propagated as the gas turbine turn to be in the extinction during shutdown operation.
公益社団法人日本ガスタービン学会の論文
2006-10-01