Dynamic Impact Response of Inconel 718 Alloy under Low and High Temperatures
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- Lee Woei-Shyan
- Department of Mechanical Engineering, National Cheng Kung University
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- Lin Chi-Feng
- National Center for High-Performance Computing
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- Chen Tao-Hsing
- Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences
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- Chen Hong-Wei
- Department of Mechanical Engineering, National Cheng Kung University
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Dynamic impact response of Inconel 718 alloy is studied at temperatures ranging from −150 to 550°C and strain rates in the range of 1000 to 5000 s−1 using a compressive split Hopkinson pressure bar. It is found that the flow stress increases with increasing strain rate, but decreases with increasing temperature. The highest work hardening rate is observed in the specimen at the lowest temperature (−150°C) and the highest strain rate (5000 s−1). However, the work hardening rate is weakened by the deformation-induced temperature rise under high strain and strain rate conditions. The strain rate sensitivity increases with increasing strain rate, but decreases with increasing temperature. The activation energy varies as a function of the strain rate and temperature, and has a maximum value of 40 kJ/mol. The greatest thermal softening effect occurs at the highest strain rate of 5000 s−1 and temperatures in the range −150∼25°C. The microstructural observations confirm that the mechanical response of the Inconel 718 specimens is directly related to the effects of the strain rate and temperature on the evolution of the impacted microstructure.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 52 (9), 1734-1740, 2011
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679226992640
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- NII論文ID
- 10029530125
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- NII書誌ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 11225700
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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