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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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The corrosion fatigue crack propagation characteristics of SS41 steel in 3.5% NaCl solution have been evaluated for loading frequencies of 1㎐ and 0.2㎐. A sine wave loading profile was used for fatigue testing. Each test was carried out at a constant stress ratio, R(0.1).
The main results are summarized as follows ;
1. Fatigue crack propagation rate was higher in 3.5% NaCl solution than in air, higher in the base metal than in the weld metal, and higher at f=0.2㎐ than at f=1㎐.
2. The crack closure level of the base metal was not influenced by cyclic frequencies, but that of the weld metal was much influenced.
3. When the crack closure effect was eliminated in the evaluation of crack propagation characteristics by using ΔK<SUB>eff</SUB>, the environmental influence was distinctly observed. At the base metal, crack propagation rate was enhanced by the hydrogen embrittlement, and the weld metal was reduced by the crack closure.
4. There was clearly observed hydrogen embrittlement and severely corroded aspect at fracture surface of lower frequency than that of higher frequency, and at that of the base metal than that of the weld metal.
The main results are summarized as follows ;
1. Fatigue crack propagation rate was higher in 3.5% NaCl solution than in air, higher in the base metal than in the weld metal, and higher at f=0.2㎐ than at f=1㎐.
2. The crack closure level of the base metal was not influenced by cyclic frequencies, but that of the weld metal was much influenced.
3. When the crack closure effect was eliminated in the evaluation of crack propagation characteristics by using ΔK<SUB>eff</SUB>, the environmental influence was distinctly observed. At the base metal, crack propagation rate was enhanced by the hydrogen embrittlement, and the weld metal was reduced by the crack closure.
4. There was clearly observed hydrogen embrittlement and severely corroded aspect at fracture surface of lower frequency than that of higher frequency, and at that of the base metal than that of the weld metal.
목차
Abstract
1. 序論
2. 實驗裝置 및 方法
3. 實驗結果 및 考察
4. 結論
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