材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
論文
Ni基超合金一方向凝固材の冷却孔周囲の微小き裂進展に及ぼす高サイクルと低サイクル疲労負荷の重畳効果
與那國 優希吉崎 伸岡崎 正和
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ジャーナル フリー

2019 年 68 巻 2 号 p. 129-135

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Recent introduction of renewable energy systems has impelled the land based gas turbine power generation systems to play two different types of roles: one is a role as base load system, the other is a role as power adjusting system. To cope with the latter role, it is necessary to take into account of thermal fatigue failure of the gas turbine components, where transient thermal stress is often a critical issue to be concerned. In this study, non-stationary induced thermal fatigue failure behavior of a superalloy was explored. At first, a new test equipment was developed so that high cycle non-stationary thermal fatigue loading can be superimposed on stationary low cycle thermo-mechanical fatigue (TMF) loading. By means of the testing equipment, the early growth of small cracks around the cooling holes was investigated under the superimposed condition in a directionally solidified Ni-base superalloy, where some cooling holes were artificially introduced for a simulation. The experimental works clearly demonstrated that the crack growth rate under the superimposed condition was significantly accelerated, compared with that under the stationary low cycle TMF loading. This behavior was discussed based on fracture mechanistic view point.

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