Ｎｉ基単結晶超合金の十字型試験片を用いた高温多軸低サイクル疲労試験法

概要

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This paper presented the multiaxial low cycle fatigue test method for cruciform specimens of YH61 nickel base single crystal superalloy . The elastic compliances were obtained in tensile and torsion tests using single crystal bar specimens whose specimen axis was aligned to the crystal growth directions of [100] and [110]. Elastic finite element analysis was performed to determine specimen shape and relationship between the specimen axis and crystal growth direction. Multiaxial low cycle fatigue tests were performed using the cruciform specimens whose x axis was aligned to the [001] direction and the y axis to [010], [110] and [210] directions both x and y axis were aligned to the<110> direction. Mises equivalent strain was not a suitable parameter and Mises equivalent stress was proved to be available for the correlating the multiaxial fatigue lives of the single crystal superalloy.