S0306-1-3 IN738LC合金の結晶方位解析によるクリープ・疲労損傷評価([S0306-1]損傷の結晶解析的評価)

概要

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The Ni-base superalloy IN738LC developed as a heat-resistant material for gas turbines is used under the conditions of creep-fatigue interaction. To maintain operational safety and minimize maintenance costs, it is necessary to clarify the characteristics of fracture life taking into account the effect of both creep and fatigue interaction on fracture life. In this paper, an in-situ observational testing method under the conditions of creep-fatigue interaction was conducted using IN738LC, and the effects of cycle- and time-dependent mechanisms on the fracture life were investigated. As a result, the multiple effects of creep and fatigue on fracture life t_f were clarified by a three-dimensional curved surface representation of the load frequency characteristic. Furthermore, the concentration of damage by the effect of fatigue and the diffusion of damage by the effect of creep are observed by microscopic crystal orientations analysis using electron Backscatter Diffraction.
一般社団法人日本機械学会の論文
2010-09-04