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순수 분위기에서 터빈 강의 응력부식균열 거동에 미치는 환경 요소의 영향
孟完永,李珍炯,金宇哲,元昌煥 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.7
Slow Strain Rate Tests(SSRT) were carried out to investigate the effect of dissolved oxygen on stress corrosion cracking(SCC) susceptibility of 3.5NiCrMoV steels used in discs of low-pressure(LP) steam turbines in electric power generating plants. The influence of dissolved oxygen on cracking in water was studied; for this purpose, specimens were strained to fracture at 150℃ in water environments with various amounts of dissolved oxygen. Also Tests were conducted in aerated water at temperature of 50∼200℃ and at various strain rates (5×10^-8∼1×10^-5 s-1). The maximum elongation of the turbine steel decreased with decreasing strain rate, and with increasing temperature. Dissolved oxygen significantly affected the SCC susceptibility of turbine steel in water. The increase of the SCC susceptibility of the turbine steel in a higher dissolved oxygen environment is due to the non protectiveness of the oxide layer of the turbine steel surface and the increase of corrosion current.
3.5NiCrMoV 강의 부식피로균열성장에 미치는 용존수소의 영향
이정국,맹완영,김우철 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.11
The effect of dissolved hydrogen on the corrosion fatigue crack growth(FCG) behavior of 3.5NiCrMoV steel in pure water at 25℃ and 150℃ was investigated. The corrosion fatigue crack growth rate measurements employing fracture mechanics specimens were performed in pure water. The water circulating loop system was used to control corrosion environment. The FCG rates highly increased in pure water with the large amount of the dissolved hydrogen (35 cc/kgH₂O) at 25℃. However, it made no difference to FCG in pure water at 150℃ regardless of the contents of the dissolved hydrogen(35 cc/kgH₂O; 0.1 cc/kgH₂O). The hydrogen embrittlement significantly influences the corrosion fatigue crack growth rate of 3.5NiCrMoV steel in pure water of 35 cc/kgH₂O at 25℃.