| Effect of δ Phase on Hydrogen Embrittlement of Inconel 718 by Notch Tensile Tests |
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| 作者姓名： | Akio Hirose Kojiro F.Kobayashi |
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| 作者单位： | Department of Manufacturing Science Graduate School，Osaka University，Yamadaoka 2-1，Suita，Osaka，565-0871，Japan，Department of Manufacturing Science Graduate School，Osaka University，Yamadaoka 2-1，Suita，Osaka，565-0871，Japan |
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| 摘 要： | The effect of δ phase on the hydrogen embrittlement (HE) sensitivity of Inconel 718 was investigated by conducting notch tensile tests. Notch tensile specimens with various precipitation morphologies of δ phase were prepared with different heat treatments, and hydrogen was charged into the tensile specimens before tensile tests via a cathodic charging process. The loss of notch tensile strength (NTS) due to the charged hydrogen was used to evaluate the hydrogen embrittlement sensitivity. The results show that δ phase has deleterious effect on NTSs, and the fracture of hydrogen-charged specimens initiated near the notch surfaces. The loss of NTS caused by precharged hydrogen can be greatly decreased by dissolving δ phase. δ-free Inconel 718 alloy is proposed for the applications in hydrogen environments.
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| 关 键 词： | Superalloy Hydrogen embrittlement δ phase Inconel 718 |
| 收稿时间： | 2004-02-02 |
Effect of δ Phase on Hydrogen Embrittlement of Inconel 718 by Notch Tensile Tests |
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| Akio Hirose,Kojiro F.Kobayashi.Effect of δ Phase on Hydrogen Embrittlement of Inconel 718 by Notch Tensile Tests[J].Journal of Materials Science & Technology,2005,21(2):256-260. |
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| Authors: | Liufa LIU Chen LU Wenjiang DING Akio Hirose Kojiro FKobayashi |
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| Affiliation: | School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China... |
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| Abstract: | The effect of δ phase on the hydrogen embrittlement (HE) sensitivity of Inconel 718 was investigated by conducting notch tensile tests. Notch tensile specimens with various precipitation morphologies of δ phase were prepared with different heat treatments, and hydrogen was charged into the tensile specimens before tensile tests via a cathodic charging process. The loss of notch tensile strength (NTS) due to the charged hydrogen was used to evaluate the hydrogen embrittlement sensitivity. The results show that δ phase has deleterious effect on NTSs, and the fracture of hydrogen-charged specimens initiated near the notch surfaces. The loss of NTS caused by precharged hydrogen can be greatly decreased by dissolving δ phase. δ-free Inconel 718 alloy is proposed for the applications in hydrogen environments. |
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| Keywords: | Superalloy Hydrogen embrittlement δ phase Inconel 718 |
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