B-17 発電ガスタービン用Ni基単結晶動翼の開発(材料II,一般講演)

概要

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The first stage single crystal bucket was developed with YH-61 for H25 gas turbine. As for YH-61 of the single crystal alloy, various characteristics were estimated as single-crystal materials. And then, mis-oriented grain was simulated in directionally solidified materials and bicrystal materials; there fatigue strength was evaluated. With stress calculated by FEM analysis, fatigue life of portion with mis-oriented grain was evaluated. As a result, mis-oriented grain in radial fin and dovetail parts were permitted. In the single-crystal casting examination of the H25 first stage bucket, the casting yield that was similar to conventional casting product was achieved. As for the cast single-crystal bucket, thickness of the wing part was corrected. In addition, vibration of all single crystal buckets was measured. The H25 gas turbine that a single-crystal bucket was used for is run afterwards.
公益社団法人日本ガスタービン学会の論文
2008-10-01