SB-11-4(118) Effects of Loading Frequency and Environment on Creep-Fatigue Small Crack Growth Behavior in CM247 Polycrystalline Ni-Base Superalloy(Microstructure & Crack Propagation of Superalloys)
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概要
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Naturally initiated small crack growth behavior of a conventional cast Ni-Base superalloy, CM247LC-CC, were studied under triangle fatigue loading and trapezoidal creep-fatigue loading with a hold time in tension at a temperature of 1123K in vacuum and in air. During the study special attentions have been paid to understand the following articles : (i) microstructural aspect of crack initiation, (ii) effect of loading frequency on the creep-fatigue small crack propagation ; and (iii) effect of environment on the small crack propagation. The experimental results under different loading frequency in vacuum indicated that the small crack propagation under the trapezoidal creep-fatigue loading was essentially dominated by time-dependent creep mechanism in this study. Regarding as the environmental effect, the chemical analysis utilizing an electron prove microanalyzer revealed that the depletion of γ ' precipitates ahead of the crack tip due to oxidation attack might degradate the crack propagation resistance.
- 一般社団法人日本機械学会の論文
- 2001-06-03
著者
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Okazaki Masakazu
The University Of Tokyo Department Of Metallurgy
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Okazaki Masakazu
The University Of Tokyo
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Yamazaki Yasuhiro
Niigata Institute of Technology
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NUNOMURA Shigetomo
Niigata Institute of Technology
関連論文
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- TS-100 High-Cycle Fatigue Failure Modelling and the Endurance Prediction of Ni-Base Superalloy Protective Coatings(Session D-5 Maintenance and Control 2)
- SB-11-4(118) Effects of Loading Frequency and Environment on Creep-Fatigue Small Crack Growth Behavior in CM247 Polycrystalline Ni-Base Superalloy(Microstructure & Crack Propagation of Superalloys)
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