材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
論文
EBSD法による凝固制御Ni基超合金切欠き材のクリープ損傷評価
小林 大輔竹内 勉中別府 克司横堀 壽光
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2018 年 67 巻 2 号 p. 276-283

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Intermittent EBSD assessment of creep damage behavior was performed on five kinds of notched specimens of a Ni-base superalloy DS material. As a result, it was found that the fixed area average intra-grain misorientations (GRODave) of the notched damaged material corresponded to the NOD (Notched Opening Displacement). In addition, a misorientation parameter (GRODave/φ0) normalized with the initial notch opening value was able to express creep curves regardless of the notch geometries as well as the RNOD (Relative Notched Opening Displacement). Furthermore, a misorientation parameter (∫GRODext/φ0) normalized with the initial notch opening value after extracting the GROD value exceeding a threshold on the GROD map was proposed. It was concluded that the damage assessment parameter of ∫GRODext/φ0 uniformly allowed creep damage assessment by generally defining the damage evaluation area even for actual components with various stress concentrated areas.

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