In order to develop a procedure for evaluating the degradation of impact toughness in directionally solidified Ni-base superalloy CM247LC, which is commonly used for advanced gas turbine blades, the change in small punch (SP) fracture energy due to thermal aging has been investigated. The SP testing technique has been applied to materials aged under various aging conditions, and correlation with the results of Charpy V-notch impact tests has been examined. The experimental results reveal that SP fracture energy at room temperature decreases with aging at 800 °C and is uniquely correlated with high-temperature Charpy impact toughness. The current experiment has shown that the SP testing technique is useful in evaluating the degree of thermal aging embrittlement, one of the parameters required for remaining-life prediction of aged components.
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October 2005
Research Papers
Evaluation of Thermal Aging Embrittlement in Directionally Solidified Ni-Base Superalloy by Small Punch Test
Shin-ichi Komazaki,
Shin-ichi Komazaki
Associate Professor
Department of Materials Science and Engineering,
komazaki@mmm.muroran-it.ac.jp
Muroran Institute of Technology
, 27-1 Mizumoto-cho, Muroran, 050-8585, Japan
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Tetsuo Shoji,
Tetsuo Shoji
Fracture Research Institute, Graduate School of Engineering,
Tohoku University
, Aoba 01, Aramaki, Aoba-ku, Sendai, 980-8579, Japan
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Kazumune Takamura
Kazumune Takamura
Fracture Research Institute, Graduate School of Engineering,
Tohoku University
, Aoba 01, Aramaki, Aoba-ku, Sendai, 980-8579, Japan
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Shin-ichi Komazaki
Associate Professor
Department of Materials Science and Engineering,
Muroran Institute of Technology
, 27-1 Mizumoto-cho, Muroran, 050-8585, Japankomazaki@mmm.muroran-it.ac.jp
Tetsuo Shoji
Fracture Research Institute, Graduate School of Engineering,
Tohoku University
, Aoba 01, Aramaki, Aoba-ku, Sendai, 980-8579, Japan
Kazumune Takamura
Fracture Research Institute, Graduate School of Engineering,
Tohoku University
, Aoba 01, Aramaki, Aoba-ku, Sendai, 980-8579, JapanJ. Eng. Mater. Technol. Oct 2005, 127(4): 476-482 (7 pages)
Published Online: April 5, 2005
Article history
Received:
February 27, 2004
Revised:
April 5, 2005
Citation
Komazaki, S., Shoji, T., and Takamura, K. (April 5, 2005). "Evaluation of Thermal Aging Embrittlement in Directionally Solidified Ni-Base Superalloy by Small Punch Test." ASME. J. Eng. Mater. Technol. October 2005; 127(4): 476–482. https://doi.org/10.1115/1.2019983
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