Creep Crack Initiation and Growth Behavior for Ni-Base Superalloys

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概要

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• The structural components which are used in high temperature gas turbines have various shapes which may cause the notch effect. Moreover, the site of stress concentration might have the heterogeneous microstructural distribution. Therefore, it is necessary to clarify the creep fracture mechanism for these materials in order to predict the life of creep fracture with high degree of accuracy. In this study, the creep crack growth tests were performed using in-situ observational testing machine with microscope to observe the creep damage formation and creep crack growth behavior. The materials used are polycrystalline Ni-base superalloy IN100 and directionally solidified Ni-base superalloy CM247LC which were developed for jet engine turbine blades and gas turbine blades in electric power plants, respectively. The microstructural observation of the test specimens was also conducted using FE-SEM/EBSD. Additionally, the analyses of two-dimensional elastic-plastic creep finite element using designed methods were conducted to understand the effect of microstructural distribution on creep damage formation. The experimental and analytical results showed that it is important to determine the creep crack initiation and early crack growth to predict the life of creep fracture and it is indicated that the highly accurate prediction of creep fracture life could be realized by measuring notch opening displacement proposed as the <I>RNOD</I> characteristic.

著者

• Matsuzaki Takashi

  Department Of Anesthesiology And Resuscitology Okayama University Medical School

• Sugiura Ryuji

  Department Of Nanomechanics Tohoku University

• Yokobori Jr.

  Department of Nanomechanics, Tohoku University

• OZEKI Go

  Department of Nanomechanics, Tohoku University

• NAGUMO Yoshiko

  Department of Nanomechanics, Tohoku University

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