B112 低圧タービン翼へのレーザピーニング技術の適用 : レーザピーニング施工した12Cr鋼の疲労特性評価(保全管理・補修/材料強度・破壊評価,OS6 保全・設備診断技術)

概要

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Some damages were found at the forks of low pressure turbine blades caused by random vibration and steam-flashback vibration. In this study, for the aim of fatigue property improvement, laser peening technology for 12Cr stainless steel was developed and material properties were examined. Laser peening is a process to induce compressive residual stress to the material surface. Fatigue specimens which simulate the stress concentration zone of forks were fabricated and laser peening was applied to the surface of specimens. Residual stress was measured by X-ray diffraction and compressive residual stress was formed on the peened surface. As the results of fatigue test, fatigue strength of the laser peened specimens was improved about 40 percent compared to the unpeened specimens.
2009-06-28