Thermal Aging Embrittlement of Service-Exposed Udimet 520 Gas Turbine Blade(Student Poster Session)
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概要
- 論文の詳細を見る
It is known that the impact toughness of polycrystalline Ni-base superalloy, commonly used in gas turbine blades decreases with increasing exposure time at an elevated temperature. For the present study, the change in impact toughness of the Ni-base superalloy Udimet 520, which had been used in service as a first-stage blade in a 1150℃ class gas turbine for 31626 hours, was investigated by small punch (SP) tests. Experimental results revealed that in the pitch line region where the metal temperature was highest there was a decrease of the SP fracture energy E_<SP>, although the E_<SP> measured on the root shank was higher than that on the unexposed blade. That is, in contrast with the root shank, the pitch line region of the present U-520 blade became embrittled due to prolonged in service exposure. It was also found that the increase in the amount of grain boundary M_<23>C_6 carbides, which provide sites for cracks to initiate and/or propagate, was a predominant factor in the thermal aging embrittlement of U-520. Additionally, the influence of rejuvenation treatment, which is usually conducted to restore creep strength, on the toughness has also been examined by SP tests
- 一般社団法人日本機械学会の論文
- 2001-10-20
著者
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OGAWA Kazuhiro
Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University
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SHOJI Tetsuo
Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University
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Ogawa Kazuhiro
Fracture Research Institute Tohoku University
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Ogawa Kazuhiro
Fracture And Reliability Research Institute Tohoku University
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OGAWA Yuuya
Fracture Research Institute, Tohoku University
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KOMAZAKI Shin-ichi
Dept. of Materials Science and Engineering, Muroran Institute of Technology
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MARUYAMA Masahide
Thermal Power Department, Tohoku Electric Power Co., Inc.
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Maruyama Masahide
Thermal Power Department Tohoku Electric Power Co. Inc.
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Shoji Tetsuo
Fracture And Reliability Research Institute Tohoku University
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Ogawa Yuuya
Fracture Research Institute Tohoku University
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Komazaki Shin-ichi
Dept. Of Materials Science And Engineering Muroran Institute Of Technology
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