TY - JOUR
T1 - Branch cracking behavior under high temperature creep condition related to the microstructural strengthening mechanism of IN100
AU - Yoshiko Nagumo, A.
AU - Yokobori, Toshimitsu
AU - Sugiura, Ryuji
AU - Matsuzaki, Takashi
AU - Ito, Yusuke
N1 - Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2010/3
Y1 - 2010/3
N2 - Recently, the development of the high-efficiency technology for gas turbine and jet engine is required to minimize carbon dioxide and nitrogen oxide emission. It is effective way to increase the operational temperature to develop the high-efficiency technology for high temperature instruments. To increase the operating temperature, advanced nickel based superalloys have been developed as a turbine blade material. Even though a nickel based superalloy is used for a structural component, creep damages and creep cracks may be caused due to the external tensile load under high temperature conditions. Therefore, a predictive law of creep crack growth life is necessary to maintain operational safety. This study is aimed to clarify the branch cracking behavior due to the microstructural strengthening mechanism of polycrystalline nickel based superalloy IN100 under the creep condition. The creep crack growth tests were conducted at a temperature of 900°C. The creep crack growth behavior and creep damage formulation were observed by in-situ observational system and SEM/EBSD. Additionally, two dimensional elastic-plastic creep finite element analyses were conducted for the model, which describes the experimental results. The creep crack growth behavior and the creep damage progression were found to be affected by the distribution behaviors of grains and grain boundaries around the notch tip. By comparison of experimental results with mechanical analysis using FEM analyses, mechanisms of the creep crack growth and the creep damage formulation were clarified.
AB - Recently, the development of the high-efficiency technology for gas turbine and jet engine is required to minimize carbon dioxide and nitrogen oxide emission. It is effective way to increase the operational temperature to develop the high-efficiency technology for high temperature instruments. To increase the operating temperature, advanced nickel based superalloys have been developed as a turbine blade material. Even though a nickel based superalloy is used for a structural component, creep damages and creep cracks may be caused due to the external tensile load under high temperature conditions. Therefore, a predictive law of creep crack growth life is necessary to maintain operational safety. This study is aimed to clarify the branch cracking behavior due to the microstructural strengthening mechanism of polycrystalline nickel based superalloy IN100 under the creep condition. The creep crack growth tests were conducted at a temperature of 900°C. The creep crack growth behavior and creep damage formulation were observed by in-situ observational system and SEM/EBSD. Additionally, two dimensional elastic-plastic creep finite element analyses were conducted for the model, which describes the experimental results. The creep crack growth behavior and the creep damage progression were found to be affected by the distribution behaviors of grains and grain boundaries around the notch tip. By comparison of experimental results with mechanical analysis using FEM analyses, mechanisms of the creep crack growth and the creep damage formulation were clarified.
KW - Branch cracking
KW - Creep
KW - Finite element analysis
KW - Microstructural strengthening
KW - Nickel based superalloy
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U2 - 10.2320/jinstmet.74.142
DO - 10.2320/jinstmet.74.142
M3 - Article
AN - SCOPUS:77951570269
VL - 74
SP - 142
EP - 148
JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
SN - 0021-4876
IS - 3
ER -